Raspberry Pi

• SenseHAT

- api Referenz: https://pythonhosted.org/sense-hat/api/

https://learn.adafruit.com/what-is-the-command-line/getting-a-terminal-on-your-raspberry-pi

• bei Meldung

E: Für das Depot »http://raspbian.raspberrypi.org/raspbian buster InRelease« wurde der »Suite«-Wert von »testing« in »stable« geändert.
N: Sie müssen dies explizit bestätigen, bevor Aktualisierungen von diesem Depot angewendet werden können. Lesen Sie die apt-secure(8)-Handbuchseite, wenn Sie weitere Informationen benötigen.

sudo apt update

• rrd-Tool

install

sudo apt-get install rrdtool

• Beispiel

rrdtool create temperature.rrd --step 300 \
 DS:temp:GAUGE:600:-273:5000 \
 RRA:AVERAGE:0.5:1:1200 \
 RRA:MIN:0.5:12:2400 \
 RRA:MAX:0.5:12:2400 \
 RRA:AVERAGE:0.5:12:2400

• This sets up an RRD called temperature.rrd which accepts one temperature value every 300 seconds.
• If no new data is supplied for more than 600 seconds, the temperature becomes *UNKNOWN*. The minimum acceptable value is -273 and the maximum is 5'000.

A few archive areas are also defined.

• The first stores the temperatures supplied for 100 hours (1'200 * 300 seconds = 100 hours).
• The second RRA stores the minimum temperature recorded over every hour (12 * 300 seconds = 1 hour), for 100 days (2'400 hours).
• The third and the fourth RRA's do the same for the maximum and average temperature, respectively.