Development_Help.md

Development Info/Help

• GPIO: https://www.raspberrypi.org/documentation/usage/gpio/

• DHT22 (AM2302) - temperature- and humidity sensor:

  • Shop (de): https://www.rasppishop.de/Luftfeuchtigkeit-und-Temperatusensor-DHT22-AM2302
  • Shop (int.): https://www.adafruit.com/product/393
  • Info: https://learn.adafruit.com/dht
  • Python Libary: https://learn.adafruit.com/dht/dht-circuitpython-code + https://github.com/adafruit/Adafruit_CircuitPython_DHT
  • Go Libary: https://github.com/d2r2/go-dht + https://github.com/MichaelS11/go-dht (https://www.jeremymorgan.com/tutorials/go/get-temperature-raspberry-pi-go/)

• Docs/Examples:

  • https://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging/python-setup
  • https://tutorials-raspberrypi.de/raspberry-pi-luftfeuchtigkeit-temperatur-messen-dht11-dht22/
  • https://buyzero.de/blogs/news/tutorial-dht22-dht11-und-am2302-temperatursensor-feuchtigkeitsensor-am-raspberry-pi-anschliessen-und-ansteuern
  • https://www.laub-home.de/wiki/Raspberry_Pi_DHT22_Temperatur_Sensor#Adafruit_DHT_Python_Libraries
  • https://mariadb.com/resources/blog/how-to-connect-python-programs-to-mariadb/
  • https://stackoverflow.com/a/4907053 - Python env variable

• GPIO in Docker: https://blog.alexellis.io/gpio-on-swarm/ (--device /dev/gpiomem). Only work as root in container?...

• Help/Issues found:

  • use env-variable with board.x: adafruit/Adafruit_CircuitPython_DHT#57
  • full buffer: adafruit/Adafruit_CircuitPython_DHT#33
  • DHT sensor not found: adafruit/Adafruit_CircuitPython_DHT#49
  • Checksum not validate: sleep time problem or use other pin?

• Other info:

  • Tested 2020-02-25 with: RPi.GPIO==0.7.0 (with gcc 9), adafruit-circuitpython-dht==3.5.4/3.5.5, mariadb==1.0.6 on Alpine 3.12 mit Python 3.9
  • Alpine 3.13? Then echo "@previous https://dl-cdn.alpinelinux.org/alpine/v3.12/main" >> /etc/apk/repositories and to install gcc version 9.x gcc@previous for RPi.GPIO