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I programmed a smart plug to react to the greenness of the grid
- ErikCorry 4y agoThis smart plug has an ESP32 microcontroller in it. Using 200 lines of Toit code and libraries for NTP, HTTPS, JSON, etc., it fetches the current electricity price from a free online service and uses it to switch on a lava lamp only when the electricity is green and cheap. There's a manual override.