CN104792947A - Portable formaldehyde detecting equipment - Google Patents
Portable formaldehyde detecting equipment Download PDFInfo
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- CN104792947A CN104792947A CN201510233830.3A CN201510233830A CN104792947A CN 104792947 A CN104792947 A CN 104792947A CN 201510233830 A CN201510233830 A CN 201510233830A CN 104792947 A CN104792947 A CN 104792947A
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Abstract
The invention discloses portable formaldehyde detecting equipment. A piece of existing detection instrument equipment is high in power consumption, big in size and is not suitable for being carried; a controller module of the equipment selects a working state of the equipment according to the input of a matrix keyboard in an input-output module, and the equipment has the functions of saving, inquiry, on-line detection and the like. When on-line detection of the detection equipment is carried out, a signal acquisition module starts working, formaldehyde concentration information in air is collected, and the controller is used for converting an analogue signal transmitted from the signal acquisition module into a digital signal through an internally-integrated AD module and saving the information or transmitting the digital signal to an LCD to be displayed; an RS232 interface and a JTAG interface in a communication module are used for transmitting the data between the communication module and an external computer. The portable formaldehyde testing equipment is small in size, low in power consumption, high in accuracy and convenient to carry, and has the functions of acquisition, processing and saving the data.
Description
Technical field
The invention belongs to embedded system technology field, be specifically related to portable formaldehyde testing equipment.
Background technology
At society, rapid economic development, living standards of the people improve constantly, and thing followed pollution problem is also increasing, and various malicious objectionable impurities also constantly affects our health.Wherein, formaldehyde pollution problem is particularly serious, and formaldehyde, as the material that China's toxic chemical priority acccess control list is number two, has badly influenced our healthy.Indoor formaldehyde is mostly from various artificial board, coating, paint etc., and according to relevant department to Hangzhou and Pekinese's room air sample survey display, formaldehyde all reaches more than 50%, and as can be seen here, formaldehyde examination problem has arrived the moment of being badly in need of solving.Many middle methods are had for formaldehyde examination, wherein comparatively useful have the detecting instrument set up with spectrophotometric method, this accuracy of instrument is higher, but this equipment is general larger, power consumption is higher, price, detects more complicated simultaneously, need professional, due to these shortcomings so average family cannot be come into; Formaldehyde box of testing oneself also is a good way, and this method is quick, simple, cost is also low simultaneously, but this quadrat method is a kind of semiquantitative detection method, can not accurately detect concentration.
Summary of the invention
The present invention be directed to the above-mentioned deficiency of current formaldehyde testing equipment, and propose portable formaldehyde testing equipment.
Technical scheme of the present invention: controller module, according to the input of the matrix keyboard in input/output module, selects the duty of this equipment, and this equipment has preservation, the functions such as inquiry and on-line checkingi.When detector starts on-line checkingi, signal acquisition module is started working, gather the concentration of formaldehyde information in air, the simulating signal that signal acquisition module is sended over by inner integrated A/D module by controller is converted into digital signal, this information is preserved simultaneously or is sent to LCD display.
The present invention includes controller module, power management module, memory module, signal acquisition module, communication module and input/output module.Each module all adopts existing mature technology, and controller module employing take LPC2368 as the core of microprocessor system as whole system of core; Simultaneously with LM2596S and the SPX1117M3-3.3 power management module that is core for whole system provides power supply; Wherein memory module adopts with the SST25VF016B chip of SPI protocol communication as core; Signal acquisition module with MS1100-P111 formaldehyde VOCs gas detection sensor for core; Communication module comprises jtag interface circuit, RS232 level shifting circuit; Input/output module comprises matrix keyboard and LCD socket.Be that the 5V voltage conversion circuit of core is for the partial circuit in signal acquisition module, input/output module in communication module and be that the 3.3V voltage conversion circuit of core provides 5V voltage with SPX1117M3-3.3 with LM2596S; Take SPX1117M3-3.3 as the 3.3V voltage conversion circuit of core be controller module, the partial circuit of memory module, communication module and input/output module provides 3.3V voltage.Controller module, according to the input of the matrix keyboard in input/output module, selects the duty of this equipment, and this equipment has preservation, the functions such as inquiry and on-line checkingi.When detector starts on-line checkingi, signal acquisition module is started working, gather the concentration of formaldehyde information in air, the simulating signal that signal acquisition module is sended over by inner integrated A/D module by controller is converted into digital signal, this information is preserved simultaneously or is sent to LCD display.RS232 interface wherein in communication module, jtag interface are used for transmitting data between outer computer.
Controller module comprises microprocessor U2 LPC2368, the 8th filter capacitor C7, the 9th filter capacitor C8, the tenth filter capacitor C9, the 11 filter capacitor C11, the first crystal oscillator Y1, the second crystal oscillator Y2.12 pins of U2 LPC2368,10 pins, 84 pins, 42 pins, 13 pins are connected with VDD3.3; 11 pins of U2 LPC2368,83 pins, 97 pins, 72 pins, 55 pins, 41 pins, 31 pins are connected with 15 pins and ground connection; 16 pins of U2 LPC2368, one end of the 8th filter capacitor C7 are connected with first crystal oscillator Y1 one end; 18 pins of U2 LPC2368, one end of the 9th filter capacitor C8 are connected with the first crystal oscillator Y1 other end; The other end of the 8th filter capacitor C7 is connected with the other end of the 9th filter capacitor C8 and ground connection; 23 pins of U2 LPC2368, one end of the tenth filter capacitor C9 are connected with second crystal oscillator Y2 one end; 22 pins of U2 LPC2368, one end of the 11 filter capacitor C11 are connected with the second crystal oscillator Y2 other end; The other end of the tenth filter capacitor C9 is connected with the other end of the 11 filter capacitor C11 and ground connection.
5V voltage conversion circuit comprises power management chip U1 LM2596S, the first polar capacitor C1, the second polar capacitor C2, the first inductance L 1 and voltage stabilizing diode D1, and the positive pole of the first polar capacitor C1 is connected with 1 pin of power management chip U1 LM2596S and VDD12 power supply; The anode of the negative pole of the first polar capacitor C1,3 pins of power management chip U1LM2596S, 5 pins, voltage stabilizing diode D1 is connected with the negative pole of the second polar capacitor C2 and ground connection; The positive pole of 4 pins of power management chip U1LM2596S, one end of inductance L 1, the second polar capacitor C2 is connected with VDD5.0; 2 pins of power management chip U1LM2596S, the other end of the first inductance L 1 are connected with the negative electrode of voltage stabilizing diode D1.
3.3V voltage conversion circuit comprises power management chip SPX1117M3-3.3, the 3rd polar capacitor C5, the first filter capacitor C3, the second filter capacitor C4.One end of first filter capacitor C3 is connected with VDD5.0, the positive pole of the 3rd polar capacitor C5 and 1 pin of power management chip SPX1117M3-3.3; The negative pole of the 3rd polar capacitor C5, the other end of the first filter capacitor C3,2 pins of power management chip SPX1117M3-3.3 are connected with the other end of the second filter capacitor C4 and ground connection; 3 pins, the second filter capacitor C4 of power management chip SPX1117M3-3.3 are connected with VDD3.3 voltage output end.
Memory module comprises the first resistance R1, the second resistance R2, the 3rd filter capacitor C6 and storage chip U4 SST25VF016B.1 pin of storage chip U4 SST25VF016B is connected with the SSEL pin of processor U2 LPC2368; 2 pins of storage chip U4 SST25VF016B are connected with the MISO pin of processor U2 LPC2368; 3 pins of storage chip U4 SST25VF016B, the P0.25 pin of processor U2 LPC2368 are connected with one end of the second resistance R2; The 4 pin ground connection of storage chip U4 SST25VF016B; 5 pins of storage chip U4 SST25VF016B are connected with the MOSI pin of processor U2 LPC2368; 6 pins of storage chip U4 SST25VF016B are connected with the SCK pin of processor U2 LPC2368; 7 pins of storage chip U4 SST25VF016B are connected with first resistance R1 one end; 8 pins of storage chip U4 SST25VF016B, the other end of the first resistance R1 are connected with VDD3.3 with one end of the 3rd filter capacitor C6; The other end ground connection of the 3rd filter capacitor C6; The other end of the second resistance R2 is connected with VDD3.3.
Signal acquisition module comprises sensor assembly socket JP1.1 pin of sensor assembly socket JP1 is connected with VDD5.0; 2 pins of sensor assembly socket JP1 are connected with the AD0 pin of processor U2 LPC2368; 3 pins of sensor assembly socket JP1 are connected with the P0.19 pin of processor U2 LPC2368; The 4 pin ground connection of sensor assembly socket JP1.
Communication module comprises jtag interface circuit and RS232 level shifting circuit.
Described jtag interface circuit comprises the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and jtag interface CON1.One end of 1 pin in jtag interface CON1,2 pins, the 3rd resistance R3, one end of the 4th resistance R4, one end of the 5th resistance R5, one end of the 6th resistance R6 are connected with VDD3.3; The other end of 3 pins in jtag interface CON1, the 6th resistance R6, one end of the 7th resistance R7 are connected with the nTRST pin of processor U2 LPC2368; 4 pins in jtag interface CON1 are connected with the other end of the 7th resistance R7; The other end of 5 pins in jtag interface CON1, the 5th resistance R5 is connected with the TDI pin of processor U2 LPC2368; 6 pins in jtag interface CON1 are connected with the TDO pin of processor U2 LPC2368; The other end of 7 pins in jtag interface CON1, the 4th resistance R4 is connected with the TMS pin of processor U2 LPC2368; 8 pins in jtag interface CON1,10 pins are connected and ground connection; The other end of 9 pins in jtag interface CON1, the 3rd resistance R3 is connected with the TCK pin of processor U2 LPC2368.
Described RS232 level shifting circuit comprises the 4th filter capacitor C10, the 5th filter capacitor C12, the 6th filter capacitor C13, the 7th filter capacitor C14, serial ports COM1 and level transferring chip U5 MAX3232; 1 pin of U5 MAX3232 is connected with one end of the 4th filter capacitor C10; 2 pins of U5 MAX3232 are connected with one end of the 6th filter capacitor C13; 3 pins of U5 MAX3232 are connected with the other end of the 4th filter capacitor C10; 4 pins of U5 MAX3232 are connected with one end of the 7th filter capacitor C14; 5 pins of U5 MAX3232 are connected with the other end of the 7th filter capacitor C14; 6 pins of U5 MAX3232 are connected with one end of the 5th filter capacitor C12; 11 pins of U5 MAX3232 are connected with the U0TX pin of processor U2 LPC2368; 12 pins of U5 MAX3232 are connected with the U0RX pin of processor U2 LPC2368; 13 pins of U5 MAX3232 are connected with 2 pins of serial ports COM1; 14 pins of U5 MAX3232 are connected with 3 pins of serial ports COM1; 15 pins of U5 MAX3232 are connected with the other end of the other end of the 6th filter capacitor C13, the 5th filter capacitor C12 and ground connection; 16 pins of level transferring chip U5 MAX3232 are connected with VDD3.3; The 5 pin ground connection of serial ports COM1, all the other pins are all built on stilts.
Input/output module comprises LCD interface, the first switch S 1, second switch S2, the 3rd switch S 3, the 4th switch S 4, the 5th switch S 5, the 6th switch S 6, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, the 13 resistance R13, the 14 resistance R14 and LCD socket J1.One end, one end of the tenth resistance R10 of one end of first switch S 1, one end of second switch S2, the 3rd switch S 3 are connected with the P0.8 pin of processor LPC2368; One end of one end of 4th switch S 4, one end of the 5th switch S 5, the 6th switch S 6 is connected with the P0.9 pin of processor LPC2368 with one end of the 11 resistance R11; The other end of the first switch S 1, the other end of the 4th switch S 4, one end of the 12 resistance R12 are connected with the P0.7 pin of processor LPC2368; The other end of second switch S2, the other end of the 5th switch S 5, one end of the 13 resistance R13 are connected with the P0.6 pin of processor LPC2368; The other end of the 3rd switch S 3, the other end of the 6th switch S 6, one end of the 14 resistance R14 are connected with the P0.5 pin of processor LPC2368; The other end of the 12 resistance R12, the other end of the 13 resistance R13, the other end of the 14 resistance R14 are connected ground connection; The other end of the tenth resistance R10, the other end of the 11 resistance R11 are connected with VDD3.3.1 pin of LCD interface is connected with the 8th resistance R8 and ground connection; 2 pins of LCD interface are connected with VDD5.0; 3 pins of LCD interface, the other end of the 8th resistance R8 are connected with one end of the 9th resistance R9; 4 pins of LCD interface are connected with the P3.26 of processor LPC2368; 5 pins of LCD interface are connected with the P3.25 of processor LPC2368; 6 pins of LCD interface are connected with the P1.19 of processor LPC2368; 7 pins of LCD interface are connected with the P1.20 of processor LPC2368; 8 pins of LCD interface are connected with the P1.21 of processor LPC2368; 9 pins of LCD interface are connected with the P1.22 of processor LPC2368; 10 pins of LCD interface are connected with the P1.23 of processor LPC2368; 11 pins of LCD interface are connected with the P1.24 of processor LPC2368; 12 pins of LCD interface are connected with the P1.25 of processor LPC2368; 13 pins of LCD interface are connected with the P1.26 of processor LPC2368; 14 pins of LCD interface are connected with the P1.27 of processor LPC2368; 15 pins of LCD interface are connected with the P1.29 of processor LPC2368; 17 pins of LCD interface are connected with the P0.1 of LPC2368; 20 pins of LCD interface are connected with the other end of the 9th resistance R9.
Beneficial effect of the present invention:
1 system cost is low, low price: relative to existing test in laboratory analytical equipment, this cost of equipment reduces greatly.
2 is simple to operate, and precision is high: relative to the method for existing box of testing oneself, this equipment precision improves greatly, simultaneously simple and convenient.
3 volumes are little, easy to carry: by the flexible Application to embedded system technology, and this equipment volume is little, very convenient to carry, are applicable to the use with average family.
Accompanying drawing explanation.
Fig. 1 is hardware configuration schematic diagram of the present invention.
Fig. 2 is controller module circuit theory diagrams of the present invention.
Fig. 3 is 5V voltage conversion circuit schematic diagram of the present invention.
Fig. 4 is 3.3V voltage conversion circuit schematic diagram of the present invention.
Fig. 5 is memory module circuit theory diagrams of the present invention.
Fig. 6 is signal acquisition module circuit theory diagrams of the present invention.
Fig. 7 is the jtag interface circuit theory diagrams in communication module of the present invention.
Fig. 8 is the RS232 level shifting circuit schematic diagram in communication module of the present invention.
Fig. 9 is input/output module circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific description is done to modules in the present invention.
As shown in Figure 1, the present invention includes 1 controller module, 2 power management modules, 3 memory modules, 4 signal acquisition module, 5 communication modules and 6 input/output modules.Each module all adopts existing mature technology, and 1 controller module employing take LPC2368 as the core of microprocessor system as whole system of core; Simultaneously with LM2596S and SPX1117M3-3.3 2 power management modules that are core for whole system provides power supply; Wherein 3 memory modules adopt with the SST25VF016B chip of SPI protocol communication as core; 4 signal acquisition module with MS1100-P111 formaldehyde VOCs gas detection sensor for core; 5 communication modules comprise 5-1 jtag interface circuit, 5-2RS232 level shifting circuit; 6 input/output modules comprise 6-1 matrix keyboard and 6-2LCD interface.Take LM2596S as the 5V voltage conversion circuit 2-2 of core be 4 signal acquisition module, partial circuit in 6 input/output modules and be that the 3.3V voltage conversion circuit 2-1 of core provides 5V voltage with SPX1117M3-3.3; Take SPX1117M3-3.3 as the 3.3V voltage conversion circuit 2-1 of core be 1 controller module, the partial circuit of 3 memory modules, 5 communication modules and 6 input/output modules provides 3.3V voltage.1 controller module, according to the input of the matrix keyboard in 6 input/output modules, selects the duty of this equipment, and this equipment has preservation, the functions such as inquiry and on-line checkingi.When detector starts on-line checkingi, 6 signal acquisition module are started working, gather the concentration of formaldehyde information in air, the simulating signal that 6 signal acquisition module send over is converted into digital signal by inner integrated A/D module by controller, this information is preserved simultaneously or is sent to LCD display.
As shown in Figure 2, controller module comprises microprocessor U2 LPC2368, the 8th filter capacitor C7, the 9th filter capacitor C8, the tenth filter capacitor C9, the 11 filter capacitor C11, the first crystal oscillator Y1, the second crystal oscillator Y2.12 pins of U2 LPC2368,10 pins, 84 pins, 42 pins, 13 pins are connected with VDD3.3; 11 pins of U2 LPC2368,83 pins, 97 pins, 72 pins, 55 pins, 41 pins, 31 pins are connected with 15 pins and ground connection; 16 pins of U2 LPC2368, one end of the 8th filter capacitor C7 are connected with first crystal oscillator Y1 one end; 18 pins of U2 LPC2368, one end of the 9th filter capacitor C8 are connected with the first crystal oscillator Y1 other end; The other end of the 8th filter capacitor C7 is connected with the other end of the 9th filter capacitor C8 and ground connection; 23 pins of U2 LPC2368, one end of the tenth filter capacitor C9 are connected with second crystal oscillator Y2 one end; 22 pins of U2 LPC2368, one end of the 11 filter capacitor C11 are connected with the second crystal oscillator Y2 other end; The other end of the tenth filter capacitor C9 is connected with the other end of the 11 filter capacitor C11 and ground connection.
As shown in Figure 3,5V voltage conversion circuit comprises power management chip U1 LM2596S, the first polar capacitor C1, the second polar capacitor C2, the first inductance L 1 and voltage stabilizing diode D1, and the positive pole of the first polar capacitor C1 is connected with 1 pin of power management chip U1 LM2596S and VDD12 power supply; The anode of the negative pole of the first polar capacitor C1,3 pins of power management chip U1LM2596S, 5 pins, voltage stabilizing diode D1 is connected with the negative pole of the second polar capacitor C2 and ground connection; The positive pole of 4 pins of power management chip U1LM2596S, one end of inductance L 1, the second polar capacitor C2 is connected with VDD5.0; 2 pins of power management chip U1LM2596S, the other end of the first inductance L 1 are connected with the negative electrode of voltage stabilizing diode D1.
As shown in Figure 4,3.3V voltage conversion circuit comprises power management chip SPX1117M3-3.3, the 3rd polar capacitor C5, the first filter capacitor C3, the second filter capacitor C4.One end of first filter capacitor C3 is connected with VDD5.0, the positive pole of the 3rd polar capacitor C5 and 1 pin of power management chip SPX1117M3-3.3; The negative pole of the 3rd polar capacitor C5, the other end of the first filter capacitor C3,2 pins of power management chip SPX1117M3-3.3 are connected with the other end of the second filter capacitor C4 and ground connection; 3 pins, the second filter capacitor C4 of power management chip SPX1117M3-3.3 are connected with VDD3.3 voltage output end.
As shown in Figure 5, memory module comprises the first resistance R1, the second resistance R2, the 3rd filter capacitor C6 and storage chip U4 SST25VF016B.1 pin of storage chip U4 SST25VF016B is connected with the SSEL pin of processor U2 LPC2368; 2 pins of storage chip U4 SST25VF016B are connected with the MISO pin of processor U2 LPC2368; 3 pins of storage chip U4 SST25VF016B, the P0.25 pin of processor U2 LPC2368 are connected with one end of the second resistance R2; The 4 pin ground connection of storage chip U4 SST25VF016B; 5 pins of storage chip U4 SST25VF016B are connected with the MOSI pin of processor U2 LPC2368; 6 pins of storage chip U4 SST25VF016B are connected with the SCK pin of processor U2 LPC2368; 7 pins of storage chip U4 SST25VF016B are connected with first resistance R1 one end; 8 pins of storage chip U4 SST25VF016B, the other end of the first resistance R1 are connected with VDD3.3 with one end of the 3rd filter capacitor C6; The other end ground connection of the 3rd filter capacitor C6; The other end of the second resistance R2 is connected with VDD3.3.
As shown in Figure 6, signal acquisition module comprises sensor assembly socket JP1.1 pin of sensor assembly socket JP1 is connected with VDD5.0; 2 pins of sensor assembly socket JP1 are connected with the AD0 pin of processor U2 LPC2368; 3 pins of sensor assembly socket JP1 are connected with the P0.19 pin of processor U2 LPC2368; The 4 pin ground connection of sensor assembly socket JP1.
Communication module comprises jtag interface circuit and RS232 level shifting circuit.
As shown in Figure 7, described jtag interface circuit comprises the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and jtag interface CON1.One end of 1 pin in jtag interface CON1,2 pins, the 3rd resistance R3, one end of the 4th resistance R4, one end of the 5th resistance R5, one end of the 6th resistance R6 are connected with VDD3.3; The other end of 3 pins in jtag interface CON1, the 6th resistance R6, one end of the 7th resistance R7 are connected with the nTRST pin of processor U2 LPC2368; 4 pins in jtag interface CON1 are connected with the other end of the 7th resistance R7; The other end of 5 pins in jtag interface CON1, the 5th resistance R5 is connected with the TDI pin of processor U2 LPC2368; 6 pins in jtag interface CON1 are connected with the TDO pin of processor U2 LPC2368; The other end of 7 pins in jtag interface CON1, the 4th resistance R4 is connected with the TMS pin of processor U2 LPC2368; 8 pins in jtag interface CON1,10 pins are connected and ground connection; The other end of 9 pins in jtag interface CON1, the 3rd resistance R3 is connected with the TCK pin of processor U2 LPC2368.
As shown in Figure 8, described RS232 level shifting circuit comprises the 4th filter capacitor C10, the 5th filter capacitor C12, the 6th filter capacitor C13, the 7th filter capacitor C14, serial ports COM1 and level transferring chip U5 MAX3232; 1 pin of U5 MAX3232 is connected with one end of the 4th filter capacitor C10; 2 pins of U5 MAX3232 are connected with one end of the 6th filter capacitor C13; 3 pins of U5 MAX3232 are connected with the other end of the 4th filter capacitor C10; 4 pins of U5 MAX3232 are connected with one end of the 7th filter capacitor C14; 5 pins of U5 MAX3232 are connected with the other end of the 7th filter capacitor C14; 6 pins of U5 MAX3232 are connected with one end of the 5th filter capacitor C12; 11 pins of U5 MAX3232 are connected with the U0TX pin of processor U2 LPC2368; 12 pins of U5 MAX3232 are connected with the U0RX pin of processor U2 LPC2368; 13 pins of U5 MAX3232 are connected with 2 pins of serial ports COM1; 14 pins of U5 MAX3232 are connected with 3 pins of serial ports COM1; 15 pins of U5 MAX3232 are connected with the other end of the other end of the 6th filter capacitor C13, the 5th filter capacitor C12 and ground connection; 16 pins of level transferring chip U5 MAX3232 are connected with VDD3.3; The 5 pin ground connection of serial ports COM1, all the other pins are all built on stilts.
As shown in Figure 9, input/output module comprises LCD interface, the first switch S 1, second switch S2, the 3rd switch S 3, the 4th switch S 4, the 5th switch S 5, the 6th switch S 6, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, the 13 resistance R13, the 14 resistance R14 and LCD socket J1.One end, one end of the tenth resistance R10 of one end of first switch S 1, one end of second switch S2, the 3rd switch S 3 are connected with the P0.8 pin of processor LPC2368; One end of one end of 4th switch S 4, one end of the 5th switch S 5, the 6th switch S 6 is connected with the P0.9 pin of processor LPC2368 with one end of the 11 resistance R11; The other end of the first switch S 1, the other end of the 4th switch S 4, one end of the 12 resistance R12 are connected with the P0.7 pin of processor LPC2368; The other end of second switch S2, the other end of the 5th switch S 5, one end of the 13 resistance R13 are connected with the P0.6 pin of processor LPC2368; The other end of the 3rd switch S 3, the other end of the 6th switch S 6, one end of the 14 resistance R14 are connected with the P0.5 pin of processor LPC2368; The other end of the 12 resistance R12, the other end of the 13 resistance R13, the other end of the 14 resistance R14 are connected ground connection; The other end of the tenth resistance R10, the other end of the 11 resistance R11 are connected with VDD3.3.1 pin of LCD interface is connected with the 8th resistance R8 and ground connection; 2 pins of LCD interface are connected with VDD5.0; 3 pins of LCD interface, the other end of the 8th resistance R8 are connected with one end of the 9th resistance R9; 4 pins of LCD interface are connected with the P3.26 of processor LPC2368; 5 pins of LCD interface are connected with the P3.25 of processor LPC2368; 6 pins of LCD interface are connected with the P1.19 of processor LPC2368; 7 pins of LCD interface are connected with the P1.20 of processor LPC2368; 8 pins of LCD interface are connected with the P1.21 of processor LPC2368; 9 pins of LCD interface are connected with the P1.22 of processor LPC2368; 10 pins of LCD interface are connected with the P1.23 of processor LPC2368; 11 pins of LCD interface are connected with the P1.24 of processor LPC2368; 12 pins of LCD interface are connected with the P1.25 of processor LPC2368; 13 pins of LCD interface are connected with the P1.26 of processor LPC2368; 14 pins of LCD interface are connected with the P1.27 of processor LPC2368; 15 pins of LCD interface are connected with the P1.29 of processor LPC2368; 17 pins of LCD interface are connected with the P0.1 of LPC2368; 20 pins of LCD interface are connected with the other end of the 9th resistance R9.
The work process of Portable food safety detector is as follows: controller module is according to the input of the matrix keyboard in input/output module, and select the duty of this equipment, this equipment has preservation, the functions such as inquiry and on-line checkingi.When checkout equipment starts on-line checkingi, signal acquisition module is started working, gather the concentration of formaldehyde information in air, the simulating signal that signal acquisition module is sended over by inner integrated A/D module by controller is converted into digital signal, this information is preserved simultaneously or is sent to LCD display.
Claims (1)
1. portable formaldehyde testing equipment, is characterized in that: the present invention includes controller module, power management module, memory module, signal acquisition module, communication module and input/output module; Each module all adopts existing mature technology, and controller module employing take LPC2368 as the core of microprocessor system as whole system of core; Simultaneously with LM2596S and the SPX1117M3-3.3 power management module that is core for whole system provides power supply; Wherein memory module adopts with the SST25VF016B chip of SPI protocol communication as core; Signal acquisition module with MS1100-P111 formaldehyde VOCs gas detection sensor for core; Communication module comprises jtag interface circuit, RS232 level shifting circuit; Input/output module comprises matrix keyboard and LCD socket; Be that the 5V voltage conversion circuit of core is for the partial circuit in signal acquisition module, input/output module in communication module and be that the 3.3V voltage conversion circuit of core provides 5V voltage with SPX1117M3-3.3 with LM2596S; Take SPX1117M3-3.3 as the 3.3V voltage conversion circuit of core be controller module, the partial circuit of memory module, communication module and input/output module provides 3.3V voltage; Controller module, according to the input of the matrix keyboard in input/output module, selects the duty of this equipment, and this equipment has preservation, the functions such as inquiry and on-line checkingi; When detector starts on-line checkingi, signal acquisition module is started working, gather the concentration of formaldehyde information in air, the simulating signal that signal acquisition module is sended over by inner integrated A/D module by controller is converted into digital signal, this information is preserved simultaneously or is sent to LCD display;
RS232 interface wherein in communication module, jtag interface are used for transmitting data between outer computer; Controller module comprises microprocessor U2 LPC2368, the 8th filter capacitor C7, the 9th filter capacitor C8, the tenth filter capacitor C9, the 11 filter capacitor C11, the first crystal oscillator Y1, the second crystal oscillator Y2; 12 pins of U2 LPC2368,10 pins, 84 pins, 42 pins, 13 pins are connected with VDD3.3; 11 pins of U2 LPC2368,83 pins, 97 pins, 72 pins, 55 pins, 41 pins, 31 pins are connected with 15 pins and ground connection; 16 pins of U2 LPC2368, one end of the 8th filter capacitor C7 are connected with first crystal oscillator Y1 one end; 18 pins of U2 LPC2368, one end of the 9th filter capacitor C8 are connected with the first crystal oscillator Y1 other end; The other end of the 8th filter capacitor C7 is connected with the other end of the 9th filter capacitor C8 and ground connection; 23 pins of U2 LPC2368, one end of the tenth filter capacitor C9 are connected with second crystal oscillator Y2 one end; 22 pins of U2 LPC2368, one end of the 11 filter capacitor C11 are connected with the second crystal oscillator Y2 other end; The other end of the tenth filter capacitor C9 is connected with the other end of the 11 filter capacitor C11 and ground connection;
5V voltage conversion circuit comprises power management chip U1 LM2596S, the first polar capacitor C1, the second polar capacitor C2, the first inductance L 1 and voltage stabilizing diode D1, and the positive pole of the first polar capacitor C1 is connected with 1 pin of power management chip U1 LM2596S and VDD12 power supply; The anode of the negative pole of the first polar capacitor C1,3 pins of power management chip U1LM2596S, 5 pins, voltage stabilizing diode D1 is connected with the negative pole of the second polar capacitor C2 and ground connection; The positive pole of 4 pins of power management chip U1LM2596S, one end of inductance L 1, the second polar capacitor C2 is connected with VDD5.0; 2 pins of power management chip U1LM2596S, the other end of the first inductance L 1 are connected with the negative electrode of voltage stabilizing diode D1;
3.3V voltage conversion circuit comprises power management chip SPX1117M3-3.3, the 3rd polar capacitor C5, the first filter capacitor C3, the second filter capacitor C4; One end of first filter capacitor C3 is connected with VDD5.0, the positive pole of the 3rd polar capacitor C5 and 1 pin of power management chip SPX1117M3-3.3; The negative pole of the 3rd polar capacitor C5, the other end of the first filter capacitor C3,2 pins of power management chip SPX1117M3-3.3 are connected with the other end of the second filter capacitor C4 and ground connection; 3 pins, the second filter capacitor C4 of power management chip SPX1117M3-3.3 are connected with VDD3.3 voltage output end;
Memory module comprises the first resistance R1, the second resistance R2, the 3rd filter capacitor C6 and storage chip U4 SST25VF016B; 1 pin of storage chip U4 SST25VF016B is connected with the SSEL pin of processor U2 LPC2368; 2 pins of storage chip U4 SST25VF016B are connected with the MISO pin of processor U2 LPC2368; 3 pins of storage chip U4 SST25VF016B, the P0.25 pin of processor U2 LPC2368 are connected with one end of the second resistance R2; The 4 pin ground connection of storage chip U4 SST25VF016B; 5 pins of storage chip U4 SST25VF016B are connected with the MOSI pin of processor U2 LPC2368; 6 pins of storage chip U4 SST25VF016B are connected with the SCK pin of processor U2 LPC2368; 7 pins of storage chip U4 SST25VF016B are connected with first resistance R1 one end; 8 pins of storage chip U4 SST25VF016B, the other end of the first resistance R1 are connected with VDD3.3 with one end of the 3rd filter capacitor C6; The other end ground connection of the 3rd filter capacitor C6; The other end of the second resistance R2 is connected with VDD3.3;
Signal acquisition module comprises sensor assembly socket JP1; 1 pin of sensor assembly socket JP1 is connected with VDD5.0; 2 pins of sensor assembly socket JP1 are connected with the AD0 pin of processor U2 LPC2368; 3 pins of sensor assembly socket JP1 are connected with the P0.19 pin of processor U2 LPC2368; The 4 pin ground connection of sensor assembly socket JP1;
Communication module comprises jtag interface circuit and RS232 level shifting circuit; Described jtag interface circuit comprises the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and jtag interface CON1;
One end of 1 pin in jtag interface CON1,2 pins, the 3rd resistance R3, one end of the 4th resistance R4, one end of the 5th resistance R5, one end of the 6th resistance R6 are connected with VDD3.3; The other end of 3 pins in jtag interface CON1, the 6th resistance R6, one end of the 7th resistance R7 are connected with the nTRST pin of processor U2 LPC2368; 4 pins in jtag interface CON1 are connected with the other end of the 7th resistance R7; The other end of 5 pins in jtag interface CON1, the 5th resistance R5 is connected with the TDI pin of processor U2 LPC2368; 6 pins in jtag interface CON1 are connected with the TDO pin of processor U2 LPC2368; The other end of 7 pins in jtag interface CON1, the 4th resistance R4 is connected with the TMS pin of processor U2 LPC2368; 8 pins in jtag interface CON1,10 pins are connected and ground connection; The other end of 9 pins in jtag interface CON1, the 3rd resistance R3 is connected with the TCK pin of processor U2 LPC2368;
Described RS232 level shifting circuit comprises the 4th filter capacitor C10, the 5th filter capacitor C12, the 6th filter capacitor C13, the 7th filter capacitor C14, serial ports COM1 and level transferring chip U5 MAX3232; 1 pin of U5 MAX3232 is connected with one end of the 4th filter capacitor C10; 2 pins of U5 MAX3232 are connected with one end of the 6th filter capacitor C13; 3 pins of U5 MAX3232 are connected with the other end of the 4th filter capacitor C10; 4 pins of U5 MAX3232 are connected with one end of the 7th filter capacitor C14; 5 pins of U5 MAX3232 are connected with the other end of the 7th filter capacitor C14; 6 pins of U5 MAX3232 are connected with one end of the 5th filter capacitor C12; 11 pins of U5 MAX3232 are connected with the U0TX pin of processor U2 LPC2368; 12 pins of U5 MAX3232 are connected with the U0RX pin of processor U2 LPC2368; 13 pins of U5 MAX3232 are connected with 2 pins of serial ports COM1; 14 pins of U5 MAX3232 are connected with 3 pins of serial ports COM1; 15 pins of U5 MAX3232 are connected with the other end of the other end of the 6th filter capacitor C13, the 5th filter capacitor C12 and ground connection; 16 pins of level transferring chip U5 MAX3232 are connected with VDD3.3; The 5 pin ground connection of serial ports COM1, all the other pins are all built on stilts;
Input/output module comprises LCD interface, the first switch S 1, second switch S2, the 3rd switch S 3, the 4th switch S 4, the 5th switch S 5, the 6th switch S 6, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, the 13 resistance R13, the 14 resistance R14 and LCD socket J1; One end, one end of the tenth resistance R10 of one end of first switch S 1, one end of second switch S2, the 3rd switch S 3 are connected with the P0.8 pin of processor LPC2368; One end of one end of 4th switch S 4, one end of the 5th switch S 5, the 6th switch S 6 is connected with the P0.9 pin of processor LPC2368 with one end of the 11 resistance R11; The other end of the first switch S 1, the other end of the 4th switch S 4, one end of the 12 resistance R12 are connected with the P0.7 pin of processor LPC2368; The other end of second switch S2, the other end of the 5th switch S 5, one end of the 13 resistance R13 are connected with the P0.6 pin of processor LPC2368; The other end of the 3rd switch S 3, the other end of the 6th switch S 6, one end of the 14 resistance R14 are connected with the P0.5 pin of processor LPC2368; The other end of the 12 resistance R12, the other end of the 13 resistance R13, the other end of the 14 resistance R14 are connected ground connection; The other end of the tenth resistance R10, the other end of the 11 resistance R11 are connected with VDD3.3;
1 pin of LCD interface is connected with the 8th resistance R8 and ground connection; 2 pins of LCD interface are connected with VDD5.0; 3 pins of LCD interface, the other end of the 8th resistance R8 are connected with one end of the 9th resistance R9; 4 pins of LCD interface are connected with the P3.26 of processor LPC2368; 5 pins of LCD interface are connected with the P3.25 of processor LPC2368; 6 pins of LCD interface are connected with the P1.19 of processor LPC2368; 7 pins of LCD interface are connected with the P1.20 of processor LPC2368; 8 pins of LCD interface are connected with the P1.21 of processor LPC2368; 9 pins of LCD interface are connected with the P1.22 of processor LPC2368; 10 pins of LCD interface are connected with the P1.23 of processor LPC2368; 11 pins of LCD interface are connected with the P1.24 of processor LPC2368; 12 pins of LCD interface are connected with the P1.25 of processor LPC2368; 13 pins of LCD interface are connected with the P1.26 of processor LPC2368; 14 pins of LCD interface are connected with the P1.27 of processor LPC2368; 15 pins of LCD interface are connected with the P1.29 of processor LPC2368; 17 pins of LCD interface are connected with the P0.1 of LPC2368; 20 pins of LCD interface are connected with the other end of the 9th resistance R9.
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| US20100077829A1 (en) * | 2008-09-30 | 2010-04-01 | Anthony Batista | Low differential pressure monitoring system for rooms |
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| CN2284072Y (en) * | 1996-09-17 | 1998-06-17 | 王莉 | Portable microcomputer transfusion instrument |
| US20040101108A1 (en) * | 2002-11-27 | 2004-05-27 | Boeing Management Company | System and method of conducting digital x-ray analysis |
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