I have been searching around the web for information on how to build a good Bench Power supply, and alot, if not all designs had some sort of display which acted as a voltmeter. I read into this, and all the information given to me was that they used a microcontroller, then they went ahead and gave me the code. But I was wondering, with microcontrollers like the Arduino Uno or the Raspberry Pi, how would I use them practically in my project? I have only ever seen somebody play around with it, flashing LEDs or whatever on Youtube, but of course it was only short term. An Arduino Uno is quite pricey (36 or so bucks) so I highly doubt I just throw the board in there and make it act as a second board, I've had a look around google myself and I have found nothing, If anybody could help in telling/showing me how to actually use a microcontroller in a long-term project, that would be very helpful!