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Topic: analogRead with Potentiometer / Watt (Read 1 time) previous topic - next topic


ARef should have a capacitor across it. It should not be connected to +5V.


Posted on: November 12, 2011, 05:33:35 PM
Posted by: Frank Burns
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ok, i tested the poti in on a fresh breadboard and it works.
on the new breadboard the ARef is conn. to +5V. maybe
thats the different.
now i will test the poti in the complete circuit of the PCB
(this time with conn. ARef).

i will report if it DONT work. otherwise thanks for help :-)

Posted on: November 13, 2011, 05:21:57 AM
Posted by: Frank Burns
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ok, it works.....

the only thing i done is to connect ARef with +5V.

somewhere i read that without a connection to ARef
the Atmega uses a 1.1V Ref.Voltage.
Maybe this is why my poti smokes if i use it with 5V.

plz read my post nr. #4.

iam on a breadboard where ARef was not connected

Do you know what you have or are you changing things and not saying until later?
Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

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