Temperature and Humidity sensor for ESP8266 for DHT11 and AM2315, with neopixel status/night light
- ESP8266
- DHT-11 or AM2315 temperature/humidity sensor
- Optional WS2812B neopixel LED
- 3D printed case
- USB Power Adapter (fits case) - Amazon
- USB A to micro adapter (fits case) - Amazon
The comments in the source code give wiring instructions. I chose to wire-wrap the components since there are really no external forces or vibration on the sensor once it is plugged in.
The DHT-11 case is designed to allow the sensor to slide (tight fit) into the bottom of the case. Solder or wire-wrap leads to the sensor before inserting into the case, making sure they are long enough to reach the ESP8266 pins before assembly. Connect the components to the ESP8266.
I chose to cut a small square of anti-static foam and insert it into the bottom of the case. It provides some insulation between the temperature sensor and the ESP8266, and also provides some pressure to keep the two halves of the case tightly together.
I hot-glued the neopixel onto the back side of the ESP8266 making that the "front" of the device.
Slide the ESP8266 into the case with the proper orientation, plug the USB adapter into the ESP8266, plug the adapter into the power adapter, then slide the box for the adapter from back to front, sliding the tabs on the longer portion of the case into the box portion, locking the two together.
The finished result can be seen above.
The sensor started as a special purpose project to push data from multiple sensors around the house into a dashboard application.
When the device is first powered on, it creates a Wifi access point called "AutoConnectAP". Connect to that WiFi access point with your external device and you should be presented with the initial configuration page for the device. Some of the settings are likely not suitable for your application and should be adjusted accordingly in the source code.
Once WiFi is configured, the device starts its internal HTTP processes and begins collecting and transmitting data. The built-in web server handles several routes.
Given a host name like "outside_temp.local", the default route http://outside_temp.local/ will return a JSON object containing temperature and humidity values.
Other routes include:
- GET /get - returns a JSON object containing the current configuration data
- POST /set - receives a JSON object containing configuration data to change within the sensor. See the example CURL command in the source code
- GET /reset - forces the device to re-enter wifi configuration mode
- GET /push - forces the device to execute its data "push" functionality
Here are a few more images of the internals:
