Long story short, I’ve pimped out my apartment with a lot of Ikea Smart products, such that I can control (and automate) everything from Home Assistant. While I admittedly have a love-hate relationship with Home Assistant, it is generally speaking a pretty impressive software.
One thing I’ve been meaning to do for some time is to log the temperature in various rooms. Since I didn’t want to put a Raspberry Pi in every room, I opted for an ESP32 with a DH22 sensor. While I initially planned to write a simple web server or MQTT client to export the data, I was lucky to run across ESPHome, which does all of this out of the box. Moreover, it also integrates seamlessly with Home Assistant.
As someone who haven’t spent a ton of time with embedded hardware, it took me a little while to get this all working. Most of the time however was spent trying to get my JZK ESP-32S ESP32 to properly read the sensor. Due to very poor documentation for the board, I wasted a lot of time. However, after finding these schematics I was able to get it to work on D25.
For those who bought the JZK ESP-32S ESP32, here is the configuration that I ended up for in ESPHome:
esphome: name: office platform: ESP32 board: esp32doit-devkit-v1 wifi: ssid: "not-my" password: "wifi-confi" # Enable fallback hotspot (captive portal) in case wifi connection fails ap: ssid: "Office Fallback Hotspot" password: "xxxx" captive_portal: # Enable logging logger: sensor: - platform: dht pin: 25 model: DHT22 temperature: name: "Office Temperature" humidity: name: "Office Humidity" update_interval: 60s # Enable Home Assistant API api: ota:
Other pro-tip for people new to Home Assistant:
- Don’t use a Raspberry Pi if you’re doing something beyond very basic. Instead use a virtual machine or similar.
- Switch to using MySQL instead of the default Sqlite3 database as the backend as it will significantly improve performance.
- Bonus: Adopt InfluxDB, which you can then consume from Grafana for better visualization.
Update 1: Air quality monitor
The next step is to solder this together on a smaller breadboard to reduce the footprint.
Update 2: Transferred to a proper board
Today I finally received my breadboard and transferred the components. Looking pretty sleek.