Hi;
Sounds weird but I will suggest one :D
If you are looking for a general purpose Circuit then :
I advice you to make a PCB where you put some training components for embedded systems programming like :
Push buttons ;
Potentiometers ;
7-segments display
Some LEDs
Some motor drivers like l298 IC
And all powered by an ATmega328p TQFP package MCU that you can program through a USB to serial chip like the famous CH340 or an FTDI chip
Text me here if you need further guidance
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