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Jun 20, 2018 at 10:30 comment added Majenko @Anna It's a common worry. As long as the 12V doesn't get connected to the Arduino it's fine.
Jun 20, 2018 at 10:28 vote accept Anna
Jun 20, 2018 at 10:28 comment added Anna Great! Thank you! As a beginner I was a bit worried about damaging the Arduino.
Jun 20, 2018 at 10:23 history answered Majenko CC BY-SA 4.0