Description

This is a project for lightweight temperature tracking. It includes code for micropython (https://micropython.org/) which reads temperature and humidity from a DHT11 sensor every 10min and transmits it to the server which renders the measurements in two plotly plots. The microcontroller code is tailored towards ESP-8266 where the device goes into deep sleep between measurements.

Wiring Diagram

TODO

Code Deployment to ESP-8266

0. Create a virtual python environment, e.g.

   mkvirtualenv --python=/usr/bin/python3 esp
   

1. Download ESP-8266 micropython firmware from https://micropython.org/download/esp8266/
2. Install esptool

   pip install esptool
   

3. Flash microtpython onto ESP-8266 (you will most probably have to run it as sudo)

   esptool.py --port <esp port> --baud 460800 write_flash --flash_size=detect 0 <micropython firmware>
   

   In my case, <esp port> is /dev/ttyUSB0
4. Install adafruit-ampy (https://pythonforundergradengineers.com/upload-py-files-to-esp8266-running-micropython.html)

   pip install adafruit-ampy
   

5. Adapt esp/config_base.json and save it as esp/config.json
   • Set your wifi credentials (I use a guest access on my router for my sensors)
   • Define a location name which will be displayed on the temperature graph
   • Define your server route -- see description below
6. Upload files to ESP-8266 (again, you will most probably have to run it as sudo)

   ampy --port <esp port> --baud 115200 put boot.py
   ampy --port <esp port> --baud 115200 put main.py
   ampy --port <esp port> --baud 115200 put config.json
   

Server Application

TODO