Flow chart circuit
- 1. Is Tx Complete ? Is Rx Flag ? Is 9 byte in FIFO ? Start Settings and read IRQ status Reset FIFO Exit A Give error code Exit Read data from FIFO Exit Send data to serial port A Read 9 bytes data from FIFO Is IRQ interrupt pin high ? Exit Is Rx flag ? Read IRQ status Exit No No No Yes Yes Yes Yes Yes No No
- 2. Start Settings SPI, ADC Read ADC results from interface circuit Wait one second Write ADC result to RF chip
- 3. RA7 Vcc RA5 R3 10k R11 R_LED SS J1 CON6 1 2 3 4 5 6 U2 MLX90129 5 14 15 4 16 17 18 1 2 3 6 7 8 9 10 11 12 13 19 20 Xin SEN3 SENUP2 Vreg SENUP1 SEN2 SEN1 Coil1 Coil2 Vf eil Xout AT IRQ MISO MOSI SCK SS SEN4 VSS VBAT V_129 C2 1uF AT RST SDO Vcc_MCU AT SS J5 Sensor 2 1 2 3 4 SDI Vmode Vreg C1 47pF RA5 J6 Sensor 1 1 2 3 4 Vbat R2 0 Ohm Vcc L1 Antenna CLK ANT2 Vreg EN RST Vchg R9 0Ohm Y2 CRYSTAL1-4/SM 1 4 2 3 SDI J3 CON3 1 2 3 Vcc CLK Vcc_MCU Vmode J9 CON5 1 2 3 4 5 IRQ SS1 RA3 U3 PIC16F1513 9 20 2 1 28 11 6 5 4 3 26 25 24 23 12 27 19 18 17 16 15 13 10 22 21 14 8 7 RA7/CLK OUT VDD RA0 VPP/MCLR RB7/ICSPDAT RC0 RA4 RA3 RA2 RA1 RB5 RB4 RB3 RB2 RC1 RB6/ICSPCLK VSS RC7 RC6 RC5 RC4 RC2 RA6/CLK IN RB1 RB0 RC3 VSS1 RA5 LED LED V_129 ICSPDAT SDO C7 1uF SS4 D3 1N4148 RA6 ICSPCLK RA4 ANT1 J4 CON6 1 2 3 4 5 6 ICSPCLK SDI SS2 U4 TPS76350DBVT 4 3 1 2 5 NC/FB EN IN GND OUT TX INT ANT1 D4 LED Xin J8 Vpow 1 2 CLK SS3 D1 DIODE ZENER C4 4.7uF SDO Reset_3150 Xout SS J10 CON2 1 2 SSup1 EN INT R6 DNP Xout SS4 SSup2 RA7 IRQ Xin SS3 Vmode J2 CON4 1 2 3 4 ICSPDAT R7 0 C5 0.1uF Reset_3150 C3 100nF J7 Vreg 1 2 Vcc SSup2 U5 CBC3150 5 14 15 4 16 17 18 1 2 3 6 7 8 9 10 11 12 13 EN GND NC Vchg NC NC NC Vbat Vout v dd Vmode NC RESET CP CN NC NC NC RA3 R10 0Ohm R50 RX Vcc Vreg SSup1 RA4D2 1N4148 RST Vbat R8 0 Vcc_MCU SS2 RA6 Vcc ANT2 C6 Vchg Vcc_MCU SS1 R4 0 Ohm_programer
- 4. C76 DNP L15 INDUCTOR TORROID C64 10uF/50V C46 100pF C40 12pF 1 C74 10uF/10V-A 5V R30 100 C750.1uF 1 C38 220pF C49 100pF R26 500 TP20 1 C50 0.01uF C47 100pF C24 47pF 3 C22 560pf C73 0.1uF R27 220 R23 0 C63 DNI U7 LM1085A 3 1 2 VIN ADJ VOUT L9 538nH C65 10uF/50V U5 LM317/CYL 3 1 2 VIN ADJ VOUT C77 DNI D9 LED Amp R20 10K Q3 RF510 C51 0.01uF R24 0 L6 538nH C21 100pF C43 27pF TP22 TEST POINT 1 TP6 TEST POINT 1 L11 4.7uH R32 50 R39 220 C41 68pF C69 10uF/25V D7 DIODE C58 560pF TP7 TEST POINT 1 U6 LM317/CYL 3 1 2 VIN ADJ VOUT C611000pF TP24 TEST POINT 1 C23 470pF C57 47pF R36 390 C48100pF TP23 TEST POINT 1 C42 68pF TP5 TEST POINT 1 TP9 TEST POINT 1 L8 538nH C55 10uF/50V TP21 TEST POINT 1 L5 1uH R21 10K C560.1uF C70 0.1uF R40 0 J11 CON2 1 2 Tx_out C62 DNI D8 DIODE C37 27pF C20 0.01uF C59 470pF C52 DNI C53 0.1uF Rx1 R1 0 R38 121 J9 DC Jack 1 2 TP18 1 C44 220pF 15V J10 CON3 1 2 3 R34 500 C45 220pF L12 422nH C66 0.01uF Rx2 C670.1uF J8 DC Jack 1 2 R11 0 C60 1000pF 5V R22 0 R29 DNP TP19 1 R31 40 L7 538nH C27 220pF R35 100 R33 10K C39 220pF C72 0.1uF 12V C68 10uF/50V J2 ANT 1 2 C36 220pF R10 0 R25 R 3 L13 169nH L14 INDUCTOR TORROID Q2 RF510 C71 1uF R37 374 TP8 TEST POINT 1 TP17 TEST POINT 1 C19 0.1uF L10 4.7uH 3
- 6. R1 11k VDD R3 1M Vref U3 MAX660 5 8 3 2 4 7 1 6 OUT V+ GND CAP+ CAP- OSC FC LV C8 10uF VDD Vref J1 Power 1 2 3.3V C5 0.02uF 3.3V C6 10uF 3.3V U5 Sensor 3 21 RE WECE U4 TPS7333Q 2 3 1 5 4 GND EN IN OUT FB/nc -3.3V -Vcc C3 0.1uF C7 4.7uF J2 Output Signal 1 2 R7 10k R4 33 -3.3V - + U1A OPAMP SINGLE SUPPLY 3 2 1 84 J3 CON2 1 2 -Vcc R6 100k -Vcc R5 11.5K - + U2A OPAMP SINGLE SUPPLY 3 2 1 84 C1 0.02uF 3.3V C2 0.02uF R2 11k C9 10uF J4 Jumper 1 2 3 4 3.3V C4 0.1uF Vref Q1 JFET P DGS
- 7. Modulator Interface circuit MCU A D C Demodulator Impedance matching Power Harvester and Voltage Regulator PCB antenna Gas Sensors
- 8. (a) (b)