Connection between Raspberry Pi + Arduino + Relays gets lock up

Hi, @johanma44
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".

This will help with advice on how to present your code and problems.

A circuit diagram would be greatly appreciated, please include component names and pin lables along with your power supplies.

Thanks.. Tom.. :smiley: :+1: :coffee: :australia: