What is a Relay Module for Arduino? - Function | New Topic

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In this note, we will about the what is a Relay Module for Arduino? and Its Function. Welcome to Diploma to Degree, an ultimate solution for diploma and degree engineering notes.

Author Name: Arun Paul.
What is a Relay Module for Arduino? - diploma to degree

What is a Relay Module for Arduino?

A relay module is an electrical component that acts as a switch, allowing low-power signals (such as those generated by a microcontroller) to control high-voltage or high-current devices like lights, motors, and domestic appliances. It acts as a bridge between logic-level electronics and electrical devices that require higher voltage or current to function.

Important Function of Relay Module

A relay module serves two basic functions: electrical isolation and switching control. When a little input voltage (often 5V or 3.3V) is provided to the module, an electromagnetic coil within the relay activates, causing an internal switch to open or close. This approach enables:

  • High-voltage devices can be turned on and off using a low-voltage control signal.
  • Protecting the regulating circuit from electrical spikes and overload.
  • Offering safe and automated switching of AC or DC devices.

Key Components of  a Relay module and Its Terminal

  • Relay (Electromagnetic switch)
  • Optocoupler (For isolation)
  • Transistor (For driving the relay)
  • Flyback Diode (To suppress voltage spikes)
  • LED Indicator (To show status)
  • Screw Terminals (For output connection)
For complete notes, check out the main website or click here to read.




 
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