Temperature / humidity sensor with Raspberry Pi, MQTT and Graphite / Grafana

Raspberry Pi (v1) with temperature/humidity sensor (DHT11) sending MQTT messages to MQTT broker while displaying current temperature and humidity on 2x16 LCD display. Includes MQTT subscriber to push MQTT metrics to Graphite / Grafana for easy graphing.

Hardware

• Raspberry Pi v1
• Chinese DHT11 temperature / humidity sensor
• Chinese 2x16 LCD display

Prerequisites

• Install Adafruit Python DHT library on you Raspberry Pi
• Install all the requirements pip install -r requirements.txt
• Start mqtt broker (testing only) docker run -d --name mqtt-broker -p 1883:1883 -p 9001:9001 toke/mosquitto
• Have Graphite with Grafana installed
• Follow the instructions here to enable I2C and find your display address
• mqtt and graphite are locally resolvable domain names in my case, change them to reflect your settings

TODO

• Add TLS
• Buy a better sensor (DHT11 has accuracy of +/- 2 degrees for temperature or +/- 5% for humidity)