![]() Wiring a Two-Channel Relay Module to an Arduino NO terminal is normally open, unless you activate the relay that connects it to the COM terminal. NC terminal is normally connected to the COM terminal, unless you activate the relay, which breaks the connection. Output Terminals:ĬOM terminal connects to the device you intend to control. Keep this pin disconnected if you remove the jumper. VCC pin is shorted to the JD-VCC pin with the jumper cap on. Without the jumper cap, you’d have to connect it to a separate 5V power source. When the jumper is in place, JD-VCC is shorted to VCC, allowing the electromagnets to be powered by the Arduino’s 5V line. JD-VCC provides power to the relay’s electromagnet. These are active low pins, which means that pulling them LOW activates the relay and pulling them HIGH deactivates it. VCC pin provides power to the built-in optocouplers and, optionally, the relay’s electromagnet (if you keep the jumper in place). Here’s a small animation showing how a relay links two circuits together. A relay can be thought of as an electric lever you turn it on with a relatively small current, and it turns on another device with a much larger current. How Do Relays Work?Īt the core of a relay is an electromagnet (a wire coil that becomes a temporary magnet when electricity is passed through it). This tutorial will walk you through setting up the relay module to turn on a lamp or other device, but first, a quick primer on relays. The only downside is that, because these are electro-mechanical devices, they are more prone to wear and tear over time. These well-contained modules are inexpensive, simple to connect, and ideal for home-brew projects that require switching modest amounts of AC or DC power. This is where relay modules come into play. ![]() However, because the Arduino runs on 5 volts, it cannot directly control these high-voltage appliances. The options are limitless as what you could do with this relay shield.In your upcoming project, you might want to use your Arduino to control a high-voltage device, like a lamp, fan, or other household appliance.Fully Assembled - Except for the microcontroller header.3 position screw terminals for the relays.The screw terminals may come in green or blue. The female headers are included if you want the capability of easy prototyping or swapping between controllers. Therefore it can be soldered directly to the board for a permanent solution. This is because the Nano Family exept for the Nano has castellated holes and no components on the bottom side. ![]() This relay shield comes fully assembled except for the female headers for the microcontroller. If you are looking to expand the number of relays to control or want to connectorize a sensor there is a 6 pin male connector on board that has 5 volts, ground, and four digital pins. These relays are rated for 10 amps up to 250 volts. There are two individually controllable relays on board that isolated from the microcontroller. Adding to it's functionality is all of the microcontrollers I/O and communication pins are also broken out to male pin headers for easy access. Thus giving you plenty of juice for your projects. The on board power supplies can provide 5 volts at up to 1.5 amps of current draw and 3.3 volts at up to 1 amp current draw. Making it perfect for both 12 volt and 24 volt systems. It superior functionality come from its capability to accept a supply voltage of up to 35 volts. This relay shield is flexible in that it works with the Arduino Nano Family of microcontrollers. The Arduino Nano Family Relay Shield provides both flexibility and functionality to the user, yet it is elegantly simple in design.
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