I made a project which sounds a 220v bell 4 times a day (5 seconds each time). It uses an Arduino nano, RTC, OLED display and a relay module. Sometimes the relay connection ends with the system hanged. Brainstorming it a little bit I’m mostly sure it’s EMI disturbing the i2c communication or somethi…

Here's an MOV that should help considerably. Here's how to connect it: [image]

Arduino hangs due to EMI

JohnRob September 20, 2021, 8:09pm 8

To start, I would put 0.1µF capacitors on every power line +v to Ground at each board. And at the input to the relay board.

1 Like

Topic		Replies	Views
uno hangs on switching the relay Motors, Mechanics, Power and CNC	6	7641	May 6, 2021
Throuble with EMI Noise General Guidance	3	967	May 5, 2021
Arduino resets from relay, some sort of interference? General Guidance	11	5394	May 5, 2021
Relay module effecting Arduino General Electronics	17	14165	May 6, 2021
240V causing trouble General Guidance	24	3037	May 5, 2021