impossible to use I2c display without crash

Discussion in 'Troubleshooting' started by motodaddo, Apr 9, 2014.

  1. motodaddo

    motodaddo New Member

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    Hi to all,
    i'm using udoo with an optoisolated relay board for an autofiller water tank.
    I'm using also an i2c display, it works quite well when used alone, but every time a relay is energized, the display starts showing strange characters udoo until it stops.
    I tried to use udoo without display and relays work without problems and without udoo locks.
    So I tried to use shielded control cables (for the relay), I tried to change the display i2c, I tried to filter the input current with capacitors (for decoupling), but was not able to run the relay along with the display .
    They are about 2 months since I stopped at this point and I do not know how to go on ...
    Have you any suggestions?
    attached you can see the display used.
    Thank you.
     

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  2. peter247

    peter247 New Member

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    Does the relay have a diode across the coil to stop back emf ? , or is a just a voltage drop spike causing your problem.
     
  3. motodaddo

    motodaddo New Member

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    Yes there is a diode across the coil
     

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