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plotting

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This commit is contained in:
William Clark 2024-08-19 18:52:31 +01:00
parent 644f99985e
commit 20b8c8c0f0
4 changed files with 50 additions and 63 deletions
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4
.gitignore vendored
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@ -2,4 +2,6 @@
bme680
bme680_i2c
bme680_spi
bme680_log*
bme680_log*
plot/*.png
plot/*.txt

67
README.md
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@ -106,8 +106,6 @@ gas resistance: 14702.868852 Ohm
=== heat_stab_r: 1
```
Note: Do not trust the gas resistance measurement if `heat_stab_r` is not `1`.
## Burn-in / logging
See file `example/log.c`
@ -119,64 +117,9 @@ See file `example/log.c`
Compile and run
```sh
stdbuf -o0 ./bme680 2>&1 | tee -a log.txt
```
This will give an output similar to this:
```
2024-05-14T13:03:02+0100 20.8916 99836.7 68.6594 7180.73 1
2024-05-14T13:04:03+0100 20.8658 99840.3 68.7844 7171.53 1
2024-05-14T13:05:03+0100 20.8979 99838.6 68.7759 7162.35 1
2024-05-14T13:06:03+0100 20.9208 99843.8 68.6436 7166.93 1
2024-05-14T13:07:03+0100 20.9303 99845.4 68.747 7144.05 1
2024-05-14T13:08:03+0100 20.9249 99846 68.7122 7139.49 0
2024-05-14T13:09:04+0100 20.9036 99845.2 68.7224 7157.76 1
2024-05-14T13:10:04+0100 20.8737 99850.5 68.575 7144.05 1
2024-05-14T13:11:04+0100 20.8753 99850.6 68.8879 7139.49 1
2024-05-14T13:12:04+0100 20.9152 99849.3 68.8602 7134.94 1
```
If last field is not 1 then the measurement, at least for gas resistance, cannot be trusted.
```sh
sed -n '/1$/p' log.txt > test.txt
```
Then graph with gnuplot
```
# gnuplot
reset
set key autotitle columnhead
set terminal pngcairo enhanced size 2*1920/3,2*1080/3
set grid
set xdata time
set timefmt "%Y-%m-%dT%H:%M:%S%z"
# gas res vs time
set title "[I_{dac}=100, 100ms, target=300 C] GasRes over time"
set xlabel "Time"
set ylabel "Gas Resistance (OHM)"
set output "gas.png"
plot 'test.txt' u 1:5 w p pt 3 ps 1 t "BME680"
set title "[I_{dac}=100, 100ms, target=300 C] Temperature over time"
set xlabel "Time"
set ylabel "Temperature (C)"
set output "temp.png"
plot 'test.txt' u 1:2 w p pt 3 ps 1 t "BME680"
set title "[I_{dac}=100, 100ms, target=300 C] Pressure over time"
set xlabel "Time"
set ylabel "Pressure (Pa)"
set output "press.png"
plot 'test.txt' u 1:3 w p pt 3 ps 1 t "BME680"
set title "[I_{dac}=100, 100ms, target=300 C] Humidity over time"
set xlabel "Time"
set ylabel "Humidity (%RH)"
set output "hum.png"
plot 'test.txt' u 1:4 w p pt 3 ps 1 t "BME680"
$ stdbuf -o0 ./bme680_log_i2c 2>&1 | tee -a data/i2c.txt &
$ stdbuf -o0 ./bme680_log_spi 2>&1 | tee -a data/spi.txt &
# wait a couple of hours or days ..
$ cd plot
$ ./plot.sh
```

37
plot/gnuplot.gpt Normal file
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@ -0,0 +1,37 @@
# gnuplot
reset
set key autotitle columnhead
set terminal pngcairo enhanced size 2*1920/3,2*1080/3
set grid
set xdata time
set timefmt "%Y-%m-%dT%H:%M:%S%z"
# gas res vs time
set title "[I_{dac}=100, 100ms, target=300 C] GasRes over time"
set xlabel "Time"
set ylabel "Gas Resistance (OHM)"
set output "gas.png"
plot 'i2c.txt' u 1:5 w p pt 3 ps 1 t "bme680-i2c", \
'spi.txt' u 1:5 w p pt 3 ps 1 t "bme680-spi"
set title "[I_{dac}=100, 100ms, target=300 C] Temperature over time"
set xlabel "Time"
set ylabel "Temperature (C)"
set output "temp.png"
plot 'i2c.txt' u 1:2 w p pt 3 ps 1 t "bme680-i2c", \
'spi.txt' u 1:2 w p pt 3 ps 1 t "bme680-spi"
set title "[I_{dac}=100, 100ms, target=300 C] Pressure over time"
set xlabel "Time"
set ylabel "Pressure (Pa)"
set output "press.png"
plot 'i2c.txt' u 1:3 w p pt 3 ps 1 t "bme680-i2c", \
'spi.txt' u 1:3 w p pt 3 ps 1 t "bme680-spi"
set title "[I_{dac}=100, 100ms, target=300 C] Humidity over time"
set xlabel "Time"
set ylabel "Humidity (%RH)"
set output "hum.png"
plot 'i2c.txt' u 1:4 w p pt 3 ps 1 t "bme680-i2c", \
'spi.txt' u 1:4 w p pt 3 ps 1 t "bme680-spi"

5
plot/plot.sh Executable file
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@ -0,0 +1,5 @@
#!/usr/bin/env sh
sed -n '/1$/p' ../data/spi.txt > spi.txt
sed -n '/1$/p' ../data/i2c.txt > i2c.txt
gnuplot gnuplot.gpt