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Temperature Data Logger and Graphic Output to a GNU-Plot PNG Image (view source)
Revision as of 03:48, 4 November 2017
, 03:48, 4 November 2017Created page with "Setup Raspberry Pi with BME280 Sensor (triple Sensor) and USB Stick * python 2.7 * bme280 drivers and software installed * gnuplot Metapackage installed Sensor Log Script: <..."
Setup Raspberry Pi with BME280 Sensor (triple Sensor) and USB Stick
* python 2.7
* bme280 drivers and software installed
* gnuplot Metapackage installed
Sensor Log Script:
<pre>
#!/bin/bash
date=$(date +"%Y-%m-%d %H:%M")
cd /home/pi/bme280/
sudo python sensor-bme280.py|sed -n 3,5p > /tmp/test.txt #read sensor
TEMP=$(cat /tmp/test.txt|grep Temp|grep Temp|cut -d":" -f2|cut -d"C" -f1)
HUM=$(cat /tmp/test.txt|grep Hum|grep Hum|cut -d":" -f2|cut -d"%" -f1)
BARO=$(cat /tmp/test.txt|grep Press|cut -d":" -f2|cut -d"h" -f1)
echo "$date;$TEMP;$BARO ;$HUM" >> /usbdisk/weatherdata.csv # create easy csv data file
</pre>
Remark: Run the Read-Script by cron every 5-10 Minutes
Plot CSV to Graphic:
gnuplot Config:
/usbdisk/config.gnuplot
<pre>
set datafile separator ";"
set terminal png size 1280,800
set title "Weatherdata"
set ylabel "Celsius"
set xlabel "Time"
set xdata time
set timefmt '%Y-%m-%d %H:%M'
set xrange ['2017-11-01 00:00':'2017-11-30 00:00']
#set xrange ['0':'10000']
set yrange ['-50':'+70']
set format x "%Y/%m/%d"
set key left top
set grid
plot "/usbdisk/weatherdata.csv" using 1:2 with lines lw 2 lt 3 title 'Temperature'
</pre>
Generate with:
<pre>
gnuplot < config.gnuplot > /var/www/html/temperature-history.png
</pre>
Remark: Change Rows "using 1:2 to 2:3" for other Images for Air Pressure and Humitdity
* python 2.7
* bme280 drivers and software installed
* gnuplot Metapackage installed
Sensor Log Script:
<pre>
#!/bin/bash
date=$(date +"%Y-%m-%d %H:%M")
cd /home/pi/bme280/
sudo python sensor-bme280.py|sed -n 3,5p > /tmp/test.txt #read sensor
TEMP=$(cat /tmp/test.txt|grep Temp|grep Temp|cut -d":" -f2|cut -d"C" -f1)
HUM=$(cat /tmp/test.txt|grep Hum|grep Hum|cut -d":" -f2|cut -d"%" -f1)
BARO=$(cat /tmp/test.txt|grep Press|cut -d":" -f2|cut -d"h" -f1)
echo "$date;$TEMP;$BARO ;$HUM" >> /usbdisk/weatherdata.csv # create easy csv data file
</pre>
Remark: Run the Read-Script by cron every 5-10 Minutes
Plot CSV to Graphic:
gnuplot Config:
/usbdisk/config.gnuplot
<pre>
set datafile separator ";"
set terminal png size 1280,800
set title "Weatherdata"
set ylabel "Celsius"
set xlabel "Time"
set xdata time
set timefmt '%Y-%m-%d %H:%M'
set xrange ['2017-11-01 00:00':'2017-11-30 00:00']
#set xrange ['0':'10000']
set yrange ['-50':'+70']
set format x "%Y/%m/%d"
set key left top
set grid
plot "/usbdisk/weatherdata.csv" using 1:2 with lines lw 2 lt 3 title 'Temperature'
</pre>
Generate with:
<pre>
gnuplot < config.gnuplot > /var/www/html/temperature-history.png
</pre>
Remark: Change Rows "using 1:2 to 2:3" for other Images for Air Pressure and Humitdity