AVR-Chat

If there are two parallel tracks/wires on the circuit board, and those two 
are in close proximity to each other; Then it is possible, by induction, for 
a signal of one track/wire to generate an �electrical noise� on the other 
track/wire.
It might be that, on the circuit board, the track/wire leading to the 
analogue input pin of the microcontroller is picking noise from some digital 
track/wire. Hence, as mentioned before, Electrical Noise.


>On Tue, 23 Aug 2005 15:52:19 -0500, you wrote:
>
> >On Tue, Aug 23, 2005 at 03:04:21PM -0500, Michael Haisley wrote:
> >> I'm having a problem with a tiny26, the ADC values seem to be just a
> >> little bit insane.  The chip works on another board just fine, and
> >> only some of our boards are having the problem so, i'm thinking defect
> >> or tolerance issue, is causing the ADC to go nuts.  Does anyone have
> >> any insight as to things that could cause the ADC to get upset?
> >
> >Electrical noise.
>
>I have seen a Tiny26 ADC do odd things if you forget to connect the analog 
>Vdd pin, like do one good
>conversion after powerup then return garbage afterwards