![]() If red is off – means relay is off – means – Common terminals of Relay are connected to NC – Thus Yellow LEDs are ON. Green LED – Connected to NO terminal of Relay Yellow LED – Connected to NC terminal of Relay ![]() If Status LED is on it means that relay is on (Common is connected to NC.) and vice versa. The Status LED tells that Relay is on of Off. Two at Normally Connected pins and two are normally open pins. ![]() Our relay has got two poles, thus we have connected 4 LED to this. This circuit is to make you understand the concept of relay. Building Circuit – 1 (Understanding of Relay) Following Diagram will give you better understanding about the relay we are using.įollowing Hardware will be required to perform the example of this tutorials. This relay has got two poles, means there are two switches but both are trigged by a single Coil thus they operate simultaneously. To use Relay with micro controller we need Transistor also for switching.
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