This question requires a bit of background.
I am building a resistor colour-band machine out of an egg carton. The idea is - you are making a project. You are unsure of a precise resistance value you need, so you use a pot. Once you have the setting right, you take the pot, plug it into this machine and it gives you the 5-band colour code for the resistor you need.
The trouble is how to display the colours in the egg-carton cups. I can come up with a few ideas - all flawed:
- RGB LEDs - but how do you display black and brown?
- LCD - but where do you get a 2X2cm LCD?
- Color wheel driven by servo/stepper - but how do you make it fit?
Can you think of any ideas that will work?