Hi to all,
i’m using arduino DUE with an optoisolated relay board for an autofiller water tank (230v solenoid valve) .
I’m using also an i2c 20x04 display, it works quite well when used alone, but every time a relay is energized, the display starts showing strange characters until arduino stops.
I tried to use DUE without display and relays work without problems and without arduino locks.
So I tried to use shielded control cables (for the relay), I tried to change the display i2c, relays board, I tried to filter the input current with capacitors (for decoupling), but was not able to run the relays 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.