Getting Started With The 4 Channel Relay Breakout
The 4 Channel Relay Breakout is an easy way to use your Arduino, Raspberry Pi, or other microcontroller to switch high voltages and high current loads. The board is both 3.3V and 5V logic compatible and uses 4 digital outputs to control 4 individual relays. Each relay has the common, normally open, and normally closed pin broken out to a convenient 5.0mm pitch screw terminal. If this all sounds over your head, don’t worry, we will be going into this in great detail!
A Few Considerations:
Before we jump into getting this relay breakout board hooked up there are a few points to consider.
• While this board can be used to switch mains power, it should be done so using extreme caution. This should not be done without the aid of an experienced electrician.
• This board uses through hole components that could short if the board is placed on a conductive surface. We recommend this board be mounted using the four corner mounting holes before use.
How It Works:
This breakout takes care of all the extra components required to use a relay with a microcontroller. Each relay can be individually driven on this board; when one of the input pins is set high it will trigger a transistor that will trip the corresponding relay and illuminate an indicator light. Each input can be directly connected to an Arduino (or other microcontroller / single board computer) without worry of damage.
If you have any questions, or need further clarification please post in the comments section below; this way future users of this tutorial can see the questions and answers!