A Relay is a digital switch to control much higher voltages and currents than your normal Arduino boards does. When inputs a logic voltage, the relay will switch to allow current to flow or cutoff, depending on your wiring. A Relay usually consists of a coil, 1 common terminal, 1 normally closed terminal and one normally open terminal. When the coil is energized, the common terminal and the normally open terminal will have continuity.
Why do we want to use a relay and do we really need to? Anytime you want
to switch on/off a device which draws more current or works with a high
voltage, you'll need to use a relay, such as controlling of headlights,
parking lights, horns, etc. There are also the 1-Channel Relay Module
and 2-Channel Relay Module for your option. Please Note that Connect the
VCC to JD-VCC with the jumper when using.
- Control Voltage: 5V DC
- Max Control Capacity: 10ADocumentSchematic