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This device is built from ESP32, Waveshare E-Paper 4.2, and Si7020 temp&humidity sensor.

It has three programmable buttons and a 1000mAh battery that provides power for roughly four months.


To achieve this lifespan the esp32 is in "deep sleep", and it "wakes" itself every hour. It connects to custom API through WiFi and go in "deep sleep" again.


At any time it can be wake via one of the buttons to execute a pre-defined task.



You can check more details on my blog

Jan 26,2021
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    • Pavel Novoselov from RUSSIAN FEDERATION, THE
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