Browsing for related DIY projects (I'm less experienced, but still determined to conquer this learning curve), many roads seem to lead back to this project on the arduino page. Bonus: AD595/594 uses 5v. I think I kind of understand the several ways to design the hardware for the PID, but...
@epicfail How's your Arduino eNail project going? I've finally wrapped my head around PID controllers and standard DIY enail boxes and I want to understand how to do it with an arduino - where's a good place to start? fyi I'm novice - the parts you listed in your last post are beyond my working...