Relay causing noise

I have an Arduino Due switching some relays and one display lcd 20x4 connected on Due I/Os too, and when the relays are switched shows some noise characters in the lcd, how to reduce or to end with it? I tried to use 100nF but didn't work.

You need to do some more debugging, as we can't.

Is the problem caused by the relay closing contacts or opening the contacts?

Is just one relay causing the problem, or do all cause the problem?

What is connected to the relay/relays causing the problem?

Is the wiring to the relays kept well away from all your other Arduino wiring?

Paul

I appreciate your answer!!

I didn't notice this information, I will test again with more attention and return here.

There is nothing connected to the displays, but I would like to use it with small motors.

What is connected to the relay/relays causing the problem?

Paul

Let’s see the actual wiring.