ESP8266 WLAN Room Climate Sensor Case (DHT22 + SSD1306 OLED)
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This is a modular 3D printed case for a small WiFi room climate sensor.
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ESP8266 WLAN Room Climate Sensor Case (DHT22 + SSD1306 OLED)
This is a modular 3D printed case for a small WiFi room climate sensor based on the ESP8266. The sensor measures temperature and humidity with a DHT22. It shows the values on a 128x64 SSD1306 OLED and serves them over a simple JSON REST API in your home network. I built these sensors to make a rented floor heating system smarter, without replacing the fixed room thermostats. One sensor goes into each room.
The case is designed in several parts. This has two benefits. First, the DHT22 sits in its own vented tower. The airflow around the sensor stays free, so a closed housing does not distort the readings. The tower also keeps the sensor away from the small amount of heat the ESP8266 produces. Second, you can print each part in a different color. Every room gets its own color scheme.
Included STEP files
ESP8266-case.step: main enclosure for the ESP8266
ESP8266_cover.step: bottom cover for the enclosure
ESP8266_OLED_mount.step: mount for the SSD1306 OLED
ESP8266_OLED_cover.step: front frame for the OLED
ESP8266_sensor_mount_cover_box_DHT22.step: vented cover for the DHT22 tower
ESP8266_sensor_mount_cover_box_mount_DHT22.step: base mount for the DHT22 tower
Print notes
No supports needed for most parts. The vented tower prints cleanly thanks to the horizontal slots. PLA or PETG both work fine for indoor use. Print the parts separately so you can mix colors per room.
Electronics and firmware
The firmware is open source. It auto-detects one or two DHT22 sensors. WiFi setup runs over a captive portal hotspot, so no credentials live in the source code. Each device gets its name in the browser and is then reachable via mDNS, for example http://kinderzimmer.local. The web interface also offers a per-sensor offset calibration in 0.1 C steps.
My blog post: https://www.byteyourlife.com/do-it-yourself/esp8266-raumklima-sensor-mit-dht22-fussbodenheizung-smart-machen/10413
Firmware and wiring: https://github.com/custom-build-robots/esp8266-room-climate-sensor
Have fun building. Feedback and remixes are welcome.