I have this grill / smoker that uses an auger to push wood pellets (saw dust pressed into what looks like rabbit food) into a fire bowl. It takes very little electricity and give fantastic flavor to everything! The trick is that it only has 3 settings: Smoke, Med, and High. They work by turning the auger on and off for certain amounts of time. Smoke is 1 min on 3 off, Med is 2 on 2 off, and High is always on. Different woods burn at different temperatures, and I have enough control issues to want finer tuning. They sell an add on unit that will let you control this more finely, but its 180 bucks! So i built my own!
LED tells me when the auger is on, display shows what percentage of the time the auger will be on, and knob is your control. Small oops, don't use MEK to clean stuff off of those cheap radio shack project boxes. It uses a solid state relay to do the actual switching
4511 display ICs driving a 2 digit 7-seg display.
Arduino Pro 5v and a 5v voltage regulator I made after another oops with the arduino on board regulator.
No schematic because I only started using eagle yesterday, and my code is probably a long messy path around a short fence so I won't damage the coders out there with it.
Also a very special thank you to RuggedCircuits and SuperCow for helping me figure out my power issues. Next time Ill use multiplexing!