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Example implementation of BME680 software. The I2C/SPI drivers are meant to run on a Raspberry Pi 4.
Connecting the purple BME680 module board to SPI:
| SPI func | BME680 Pin | Raspberry Pi Pin |
|---|---|---|
| MISO | "SDO" | GPIO 9 (Pin 21) |
| MOSI | "SDA" | GPIO 10 (Pin 19) |
| SCLK | "SCL" | GPIO 11 (Pin 23) |
| CS | "CS" | GPIO 8 (Pin 24) |
$ make
This will create demo programsbme680_i2c andbme680_spi, and logging programsbme680_log_i2c andbme680_log_spi. They all expect the pin/devices specified inspi.c andi2c.c.
The loggers spit out the following every minute:
2024-08-19T18:20:00+0100 22.2358 101068 65.8092 11054.4 1Date,Temperature °C,Pressure Pa,% RH,Measured Gas resistance Ω,Heat stability bit
Note: disregard measured gas resistance if the heat stability bit is not 1.
par_t1: 26203par_t2: 26519par_t3: 3par_p1: 35008par_p2: -10284par_p3: 88par_p4: 9692par_p5: -202par_p6: 30par_p7: 24par_p8: -4par_p9: -3469par_p10: 30par_h1: 794par_h2: 1007par_h3: 0par_h4: 45par_h5: 20par_h6: 120par_h7: -100par_g1: 208par_g2: 59781par_g3: 18range_switching_error: 19res_heat_range: 1res_heat_val: 46float modetfine: 104906.162500temp: 20.489485 degCpress: 100089.609193 Pahumidity: 64.456540 % RHgas resistance: 12100.310308 Ohm== for heater target=300.0 and ambient temp=19.0 (degC)=== gas_valid_r: 1=== heat_stab_r: 1See filecmd/log.c
Compile and run
$ make$ mkdir data$ stdbuf -o0 ./bme680_log_i2c2>&1| tee -a data/i2c.txt&$ stdbuf -o0 ./bme680_log_spi2>&1| tee -a data/spi.txt&# wait a couple of hours or days ..$cd plot$ ./plot.sh