emmanuelle1670:
hello
if you look at the datasheet of the tmp36, you can observe that it is very sensitive to electrostatic fields other device. and requires a electrical stability. So I think the bateries is not the best solution. to have less interference with other equipment, you can add a ceramic capacitor 0.1 uf in parallel and add a resistor of 750 owm on the analog pin tmp36good luck!
Emmanuelle
Think you hit the nail on the head there.
I did not have a 0.1uF ceramic, but instead a 10uF elecrolitic from another project. I think the fact that I have neglected the decoupling capacitors and this was causing a fluctuation (noticeable on the meter). One day I'll fix the scope.
After putting this across the main +- feed, this cured the readings...
Still just to work on a battery meeter now, but thats half the battle done now.
Many thanks for the help lesson learnt here is to use decoupling capacitors for everything. lol
Jimmy