The relay can be imagined as a remote control, with which we perform the necessary actions using relatively “weak” signals. The Arduino sends a signal, while the very closing or opening of the “powerful” circuit will relay special internal mechanisms. With the help of an Arduino and a relay, we control the process of switching on or off in the same way as we switch on or off the light in the house – by giving the command to short or open. In its turn, the foot mechanically closes the load contacts. There is a field in the coil, which attracts a metal foot. Supply voltage to the electromagnetic coil. The working principle of the relay is as follows. 3.7 Example of a Sketch Working Principle of Relay
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