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Learn Arduino Prototyping in 10 days by Kallol Bosu Roy Choudhuri

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Using relays with AC powered devices

In this section, we will learn the concept of separating a DC circuit from an AC circuit by using a relay device. AC powered devices operate at dangerous voltages and currents, whereas the Arduino Uno is a 5V, low current device in comparison to an AC powered device. Therefore, in order to interface the Arduino with an AC powered device, an intermediate device known as a relay is used. A typical relay device is shown in the following figure:

Figure 1:&# A typical relay device

As we can see, there are three socket type ports on the left-hand side of the Relay device. Usually, these ports are marked with ...

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