Page 1 of 1

Potentiometer giving diff values when EtherTen powered externally

Posted: Tue Apr 28, 2015 6:15 am
by AndrewTurnerAUS
Hello good people.

First off I'm not a hardware guy, I a software developer. So please be kind in helping me understand my problem. I have a single potentiometer connected to A0, I'm using the example Read Serial. When I power the board from my computer's USB I get solid readings from the potentiometer , no variation in the value printed in theserial window. This is my external power supply.
http://www.jaycar.com.au/Power-Products ... y/p/MP3800

When I connect this power supply and supply voltage past 7.2 volts the output values from the potentiometer start to fluctuate, quite a lot, anything under this is OK. Could anyone shed some light into what's going on here?

Re: Potentiometer giving diff values when EtherTen powered externally

Posted: Thu Apr 30, 2015 6:19 am
by angusgr
Hi Andrew,

What are each of potentiometer pins connected to? It should be (from one side to the other side) - Ground, A0, 5V. It doesn't matter if it's backwards, as long as GND is on one end and 5V is on the other end - the "wiper" of the pot will move from one end to the other.

If you've checked the wiring and it's correct, can I ask how exactly how much variation are you seeing and what value is the potentiometer itself?

Angus