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How to use a 5V Relay with Arduino
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Solved] Where should I put the flyback diode? - General Electronics - Arduino Forum
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Where would I add a diode on this relay to mitigate fly back EMF? This project is an automatic plant waterer using a capacitor soil moisture sensor along with a simple small
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4-Channel Relay Module - Arduino Tutorial
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arduino - Where to put the Flyback Diode in a Relay Module? - Electrical Engineering Stack Exchange
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24V in but less than 5V out on 2N4401 - General Electronics - Arduino Forum
Relay for Arduino - General Electronics - Arduino Forum