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Arduino Relay Basics - How It Works and How to Use ItHi, I'm Bill. I'm a software developer with a passion for making and electronics. I do a lot of things and here is where I ...
and this is not enough to switch the relay and the LOAD. That is why you must use an external power supply (Vcc) that is between 7 to 12 volts to power up the Arduino board and the transistor + relay.
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