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    ADC Value gets changed when a Digital output enables

    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?

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    Re: ADC Value gets changed when a Digital output enables

    electrical noise may lead ADC value
    I Respect You



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  3. #3
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    Re: ADC Value gets changed when a Digital output enables

    Hi,

    Impossible to help without schematic and PCB layout / wiring.

    My guess: ground bounce.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.


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