Its a Scientific Calculator (4 decimal accuracy) with functions like +, -, *, %, Sin, Cos, Tan, arcSin, arcCos, aTan, log made using evive.
Project tutorial by evive: an opensource embedded platoform
Make simple math with arduino UNO
Project tutorial by Joprp05
Basic calculator using the arduino mega and without the keypad library
Project showcase by FZD1416
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