william/bme680
1
1
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

update README and remove duplicate file

Browse Source
This commit is contained in:
William Clark 2024-08-21 00:13:33 +01:00
parent 06baae7e04
commit d942cd8d9e
2 changed files with 2 additions and 142 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
README.md
View File

@ -28,7 +28,7 @@ The loggers spit out the following every minute:
>Note: disregard measured gas resistance if the heat stability bit is not 1.
## spi demo
## bme680_{i2c,spi} demo output
```
par_t1: 26203
par_t2: 26519
@ -67,48 +67,9 @@ gas resistance: 12100.310308 Ohm
=== heat_stab_r: 1
```
## i2c demo
```
par_t1: 26125
par_t2: 26370
par_t3: 3
par_p1: 36262
par_p2: -10371
par_p3: 88
par_p4: 6713
par_p5: -103
par_p6: 30
par_p7: 31
par_p8: -251
par_p9: -3158
par_p10: 30
par_h1: 776
par_h2: 1010
par_h3: 0
par_h4: 45
par_h5: 20
par_h6: 120
par_h7: -100
par_g1: 183
par_g2: 59281
par_g3: 18
range_switching_error: 19
res_heat_range: 1
res_heat_val: 39
float mode
tfine: 97289.819111
temp: 19.001918 degC
press: 100226.479673 Pa
humidity: 67.022216 % RH
gas resistance: 14702.868852 Ohm
== for heater target=300.0 and ambient temp=19.0 (degC)
=== gas_valid_r: 1
=== heat_stab_r: 1
```
## Burn-in / logging
See file `example/log.c`
See file `cmd/log.c`
![Graph of gas resistance measured over time](.gitea/gas.png)
![Graph of temperature measured over time](.gitea/temp.png)

101
example/log.c
View File

@ -1,101 +0,0 @@
#define _DEFAULT_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include "bme680.h"
#include "i2c.h"
#define AMBIENT_TEMP_GUESS 19.0
#define HEATER_TARGET 300.0
int main(void) {
bme680_t bme680;
uint8_t mode;
double temperature = AMBIENT_TEMP_GUESS;
time_t curr_time;
char date[100];
bme680.dev.init = i2c_init;
bme680.dev.read = i2c_read;
bme680.dev.write = i2c_write;
bme680.dev.deinit = i2c_deinit;
bme680.dev.sleep = usleep;
mode = BME680_MODE_FLOAT | BME680_I2C | BME680_ENABLE_GAS;
if (bme680_init(&bme680, mode) != 0) {
fprintf(stderr, "bme680_init()\n");
exit(EXIT_FAILURE);
}
START:
bme680_reset(&bme680);
if (bme680_calibrate(&bme680) != 0) {
fprintf(stderr, "bme680_calibrate()\n");
bme680_deinit(&bme680);
exit(EXIT_FAILURE);
}
bme680.cfg.osrs_t = BME680_OVERSAMPLE_X16;
bme680.cfg.osrs_p = BME680_OVERSAMPLE_X16;
bme680.cfg.osrs_h = BME680_OVERSAMPLE_X8;
bme680.cfg.filter = BME680_IIR_COEFF_127;
bme680.cfg.res_heat[0] = bme680_calc_target(&bme680, HEATER_TARGET, temperature);
bme680.cfg.idac_heat[0] = BME680_IDAC(100);
bme680.cfg.gas_wait[0] = BME680_GAS_WAIT(25, BME680_GAS_WAIT_X4);
bme680.setpoint = 0;
if (bme680_configure(&bme680) != 0) {
fprintf(stderr, "bme680_configure()\n");
bme680_deinit(&bme680);
exit(EXIT_FAILURE);
}
if (bme680_start(&bme680) != 0) {
fprintf(stderr, "bme680_start()\n");
bme680_deinit(&bme680);
exit(EXIT_FAILURE);
}
if (bme680_poll(&bme680) != 0) {
fprintf(stderr, "bme680_poll()\n");
bme680_deinit(&bme680);
exit(EXIT_FAILURE);
}
if (bme680_read(&bme680) != 0) {
fprintf(stderr, "bme680_read()\n");
bme680_deinit(&bme680);
exit(EXIT_FAILURE);
}
curr_time = time(NULL);
strftime(date, 100, "%FT%T%z", localtime(&curr_time));
printf("%s %g %g %g %g %d\n",
date,
bme680.fcomp.temp,
bme680.fcomp.press,
bme680.fcomp.hum,
bme680.fcomp.gas_res,
!!bme680.heat_stab);
temperature = bme680.fcomp.temp;
// 60 secs
usleep(1000*1000*60);
goto START;
bme680_deinit(&bme680);
return 0;
}