add an output device to a microcontroller board you've designed and program it to do something
For my modification, I chose to add a button (to the RESET) and a servo motor to an ADC pin on the ATTiny44 chip with my unipolar stepper motor:![](proj_public/09/output.jpg)
![](proj_public/09/unipolarStepper_schematic.png)
![](proj_public/09/moto.jpg)
![](proj_public/09/successProgramming.jpg)
![](proj_public/09/arduino.png)
![](proj_public/09/functionalParts.jpg)
Tools:
Datasheets > Eagle > FabModule > modela > AVRDUDE