![]() They are often used to control lights, motors, and other high-power devices, and can be controlled by a variety of signals, such as switches, sensors, or microcontrollers. Relays are used to switch high power loads using a low power control signal, providing electrical isolation between the control circuit and the load. This type of relay is often used in more complex applications where multiple loads need to be switched, such as controlling two separate lights or motors. This type of relay is typically used in simple applications where only one load needs to be switched, such as turning a single light on or off.Ī 2-channel relay, on the other hand, has two switches or channels, which means it can control two separate loads or circuits independently. Common questions about Single Channel Relay Module What is the difference between 1 channel and a 2-channel relay?Ī 1-channel relay has a single switch or channel, which means it can only control one load or circuit at a time. In addition to these basic components, some relays may also include additional features, such as LED indicators, protection diodes, snubber circuits, or other components to enhance their performance and reliability. The coil is connected to a control circuit, while the contacts are connected to the load. Terminals: The terminals provide a means of connecting the relay to external circuits. Frame: The frame provides mechanical support for the relay components and protects the relay from external damage.ĥ. It opens or closes the contacts, depending on the state of the coil.Ĥ. ![]() Armature: The armature is a movable component that is attracted by the magnetic field generated by the coil. ![]() When the coil is energized, the magnetic field attracts a movable armature, which opens or closes the contacts.ģ. 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. And of course the possibilities are now endless, for example we can control the devices using TV Remote, Bluetooth, SMS, Internet, and so on.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. So that’s how we can control any High Voltage Device using Arduino or actually any other microcontroller. First a 100W light bulb, then a desk lamp and a fan heater. There is a demonstration of this example at the end of the video of this tutorial. I will mention once again here that the input of the module works inversely so a logic low at the input will actually active the relay and vice versa. Here’s the simple code, we will just use the pin number 7 for controlling the relay, so we will define it as output and make a program that will just activate and deactivate the relay each 3 seconds. Now what’s left for this tutorial is to make a simple code and test relay module how it will work.
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