Rototron highlights a project which adds solar powered sensors and home automation to a vegetable garden and transmits the data using MQTT for review and control on a mobile app.
An ESP32 running MicroPython will be used to poll the controller for voltage and current levels. A step down regulator will drop the 12 VDC output of the controller down to 5 V to power the ESP32 via its micro USB jack. The 3.3 V TTL communication lines from the MPPT charge controller are connected to the ESP32’s serial port.
See the video below and all the details of the project in the post here.
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