Arduino Uno R3 DFPlayer Mini 3 relays I also connected the Ignition Wire to this system — meaning when I turn the key ON or OFF, the Timer Relay gets a pulse too. So no matter if I lock, unlock, or ...

The wiring is easy to remember – wire the diodes in a way that they don’t conduct from 3.3 V to GND, so, in reverse, same way you’d wire up a diode to shunt a relay coil.

Using relays as the primary switching elements is at the core of his educational goal — anyone can understand how a relay works. Understandably, this thing is big.

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This Arduino Nano project uses a soil moisture sensor, two potentiometers and a relay to automatically control a device based on soil moisture levels. The relay is turned on below a minimum threshold ...

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