Hey
Thanks so much for the links. There great because the dont have interrepts and they are not too complicated!!!
Yes youre right 20MHz is WAY too much for this project. I could use only 32KHz and bring down the current draw.
I am going to use an LM34 or LM35 to measure temperature, and I was thinking of shutting it down while im waiting to save power. How long before making the actual measurement do you think I should turn it on so that the sensor has stabilized???
Thanks
Manuel