![]() Contacts: The contacts are the switching elements of the relay and can be normally open (NO) or normally closed (NC). Coil: The coil generates a magnetic field when an electrical current is passed through it, which is used to open or close the switch contacts.Ģ. The construction of a single-channel relay typically consists of the following components:ġ. Remember to check the annotations on the PCB or the datasheet before making the connections Single Channel Relay Module Parts ![]() NOTE: - In a few generic versions of the relays, the pin sequence could be different. ![]() NO is normally open unless you activate the relay which then connects it to the COM terminal NC - terminal is connected to the COM terminal by default unless you activate the relay which breaks the connection IN - This pin is also called the control pin because it is used to control the output of the relay.ĬOM - is connected to the device you intend to connect. ![]() VCC - this pin provides power to the module In this blog, we will explore how a relay works, how to interface a single-channel relay with an Arduino Uno, and demonstrate a simple example of how to use the 5v relay module to control a lamp. By using an Arduino Uno and a single-channel relay module, you can control high-voltage or high-power devices, such as lights, motors, and appliances, from your computer or mobile device. A single-channel relay is an electronic switch that can be controlled by a low-power electrical signal, such as the output from an Arduino microcontroller. ![]()
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