Raspberry Pi Zero Sensor Dashboard hosted on Balena.io

A dashboard to show temperature and humidity readings from Raspberry Pi Zero.

Adapted from Balena Sense project https://github.com/balenalabs/balena-sense for Raspberry Pi Zero and DHT22 sensor.

I recommend starting with this tutorial: https://www.balena.io/docs/learn/getting-started/raspberry-pi/python/

Features

• Flask webserver - interface to the sensor.
• Influx DB - time series db to store the metrics.
• Grafana - UI for monitoring and analytics.
• Telegraf - an agent to collect metrics. Takes a reading every 10 seconds.
• Sensor driver - a deprecated Adafruit_DHT python library installed through wheel.
• Test mode - runs without sensors. Controlled by the HAS_SENSORS env variable.

Hardware

• Raspberry Pi Zero Wireless WH (Pre-Soldered Header).
• DHT22 AM2302 Digital Temperature and Humidity Sensor Module. The sensor is connected to +5V, Ground and Pin 38 (GPIO20).

Dashboard

Balena

Build on Balena cloud

balena login
cd <project_folder>
balena push <app-name>

Build locally

• This requires "local mode" to be enabled on the device in Balena Cloud
• ssh requires a "development" OS image

# build locally
balena push <device_ip> --nolive

# ssh to the local device
ssh root@<device_ip> -p 22222

# ssh to a service
balena ssh <device_IP> <service_name>

#check what containers are running
ssh root@<device_ip> -p 22222
balena-engine ps -a

# a container can be forced to stay live and not exit by adding this to Dockerfile
CMD tail -f /dev/null