Program in Toit to switch a power outlet on and off based on the current price of electricity in Denmark. This is also a good proxy for the greenness of the electricity, as the price is largely determined by the amount of wind and solar power available.
Thanks to https://www.elprisenligenu.dk/ for the free electricity price API.
Runs on an ESP32-based smart plug, which is unfortunately not currently available for sale. Should be easy to adapt to a different ESP32-based smart plug. Join the Toit chat to learn more about Toit.
The smart plug has a button. Pressing the button moves between the three modes, AUTO, ON, and OFF. After a power cut it starts in the AUTO mode,
There is an RGB LED, controlled by the ESP32's PWM generator. The color coding is:
- Green
- Electricity is cheap, power is on.
- Orange
- Electricity is expensive, power is off.
- Red
- Electricity is very expensive, power is off.
- Blue + Green (Turquoise/Cyan)
- Plug is in manual override mode, on.
- Blue + Red (Purple)
- Plug is in manual override mode, off.
- Off
- Plug cannot fetch price data, off.
