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ADC Value gets changed when a Digital output enables

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Thamilarasan

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Hi,
I have designed a temp controller. The temp from the sensor is measured and amplified. I have an relay in my circuit.
The relay is connected with the Analog port, but in different pin.

Whenever the relay gets turned on the ADC value gets increased.
The voltage reference is same at all instance.

The chip i have used : Atmega3208.

What will be the cause?
 

Hi,

Impossible to help without schematic and PCB layout / wiring.

My guess: ground bounce.

Klaus
 
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