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Relays are used to protect a circuit from a high voltage that exceeds the value of the board’s max input/output. There are different types of relays that can either create contacts, break contacts or even a combination of the two. Some examples of relay variants are solid state relays, reed relays and control relays.
Relays
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Arduino 2 way relay module with optocoupler protection 12VZAR 32.58 ZAR 28.33 -
