You can use the reset button of the Arduino Uno shield like a push button. The data stored at SRAM and will keep after reset.
An AC load controller to periodically turn on/off any AC load.
Project showcase by Shahariar
A system to truly control power saving for any project which is made using a development board that isn't power saving in nature!
Project tutorial by Shahariar
Microcontroller based Solar PV System's charge controller, inverter, PowerBank & LED lamp with menu-based navigation system on LCD display
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