connecting a 12V relay to the Arduino
Connecting_a_12V_Relay_to_Arduino.pdf
You can watch this animation of a relay to get a sense of how it works.
The use of a diode with a relay is detailed here as well.
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Connecting_a_12V_Relay_to_Arduino.pdf
You can watch this animation of a relay to get a sense of how it works.
The use of a diode with a relay is detailed here as well.