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The (numerous) PIC MCU's I've got are all 5v so will need to use an LDO to get the voltage for it, but the ADC should only need a simple potential divider to bring it into the range that the ADC can cope with. I was considering an external current sensor for checking the ohms of the atomizer but wondered if a voltage divider could also work for that as with a known resistance and a set voltage across the divider it should be a very simple piece of math to calculate the atomizer ohms. I'd guess I'd need to have the atomizer on the ground side of the divider though and use another MOSFET to switch out the rest of the circuit from the actual atomizer driving circuit to make sure it's not going to fry the ADC channel when actually triggering the atomizer. The only thing I need to play with is the lowest voltage I can output through the atomizer without actually triggering it which will probably be a trial and error thing I'd guess.
Iam learning a lot just by reading your threads breaktru and craig. Im also reading this http://www.ladyada.net/learn/arduino/ . The only thing thats bothering me is how to start with my own sketch. i really hate math!
Hmmm.. i thought anything bigger than a 64 would be too many. Im a definite electronics noob!! Which one would you recommend?