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

anon35827816 September 20, 2021, 8:15pm 9

What's the mystery power source that goes into the 'DC in jack'?

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