Yeah. I thought of the 675 but I wanted more IO as I want to control a LCD too and that would eat a few pins. Also, the 675 doesn't have PWM and a PWM channel would be great for doing the voltage-regulation with a FET and maby a energy-storing coil. I am now aiming for the 16F818 or 819 as it has 5 AD channels and 1 PWM. The fact that I have some samples of that exact chip made the decision easy :) The FET idea is great! I'll explore it right away :) Won't need too many stages. Only to keep the accuracy to 5 or 10 mV/cell. You don't happen to have a done schematic of a voltage-booster circuit I can use ? I would love to have up to 5 amps available at up to 25 volts. (Would be cool to support 12 cells. More is not needed for most "regular" flyers in my future club.) Kyrre Aalerud ----- Original Message ----- From: "Lucas Hartmann" To: Sent: Wednesday, November 19, 2003 9:54 PM Subject: Res: [EE:] Sampling battery voltage with PIC ADC. You may use a voltage divider with a few FETs adding paralel resistances to the lower side of the divider. This way, if you use high resistance values the resistance of the FET can be ignored. Which model of PIC you intend to use? I once though of using a 8-pin PIC12F675 for a NiMh/NiCd charger, but I had no time to spend in making it work. Lucas Hartmann. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics