“It’s really easy these days to get your hands on a relay board but you’ll quickly find out that most of them are designed for 5V which can a problem for a poor raspberry pi or any other microcontroller running on 3.3V, They just don’t have the voltage required to trigger the transistor controlling the relay. So in this tutorial, I’ll show you a simple modification of these relay boards to make them 3V3 compatible.”
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