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My pleasure Nick, thanks for the positive feedback.
Hi there Jose, thanks for your questions.1. I think that it would be OK to run the pots off the battery rail. I didn't do it for two reasons, the first reason was that I wanted to make sure my batteries would last as long as possible, and the second was I figured that there might be a bit of electrical noise that could make an issue with the signal (not sure on this though, just wanted to be on the safe side)2. No real reason for this other than the fact that I use a 3 pin jack to connect my servos to the breadboard
Hi OmarA231, Thanks for your question, I would use as close to 10k as you can get, it is a good solid value that avoids most of the problems that can nail your circuit. Here is a good video for you that explains whats going on with resistors and switches:https://www.youtube.com/watch?v=wxjerCHCEMg
I had this problem when I was trying to use a 9v square battery to power the circuit, nearly drove me daft until I changed it out for 4 AA batteries.
Hi Robot55. thanks for your kind words!. You could exchange S2 and S3 with potentiometers (leave S1 as a button though)If you want to see how the code looks for moving servos with potentiometers, have a look at another one of my instructables, here: https://www.instructables.com/id/Controlling-3-serv...that should set you on the right path :) Any problems let me know and I will help you with it.
Updated the code for this as the previous version I uploaded was the wrong revision, sorry about that guys
Simple 3 button controller ...View Instructable »
It's mostly for voltage stability and of course safety. If you don't link the ground you will notice the circuit behaving weirdly at odd times.