Relay 4 – internally connected to Arduino pin12.The list below displays the type of pin control in each relay Signal pin/Input pin/Controlled pins You’ll internally connect the controlled pins to Arduino pins during Arduino stacking. NC (Normally Closed): It disconnects to COM when the Relay1 control pin is set high but connects when the Relay1 Digital 7 I/O pin (control pin7) is set low.ĬOM (Common Pin): You can control it from the digital pin. NO (Normally Open): It disconnects to COM when the Relay1 control pin is set low but connects when Relay1 control pin7 is set high. Mostly, you’ll connect them to high-voltage devices regulated by a relay shield. Output pins All four relays have three pins, namely COM, NO, and NC. There are four relays in a Relay Shield, that is, Relays 4, 3, 2, and 1. No wiring is needed you’ll only stack it on an Arduino. It’s compatible with only Mega, UNO Wifi, and Arduino boards. It is compatible with all Arduino boards. You can control it by pre-fixing Arduino’s digital pins (inflexible). You can control it using an Arduino’s digital pins. The table below summarizes the differences between the two modules. Technologists often use a Relay Shield or its alternative 4-channel relay module. The Differences between A Relay Shield and A 4- Channel Relay Module Today’s tutorial will show you how to use an Arduino Relay Shield. Some of them are four dynamic LED indicators displaying the relays’ states, four high-quality relays, NC/NO interfaces, etc. A relay shield also has exceptional features. The devices include fans, light bulbs, LED strips, pumps, actuators, etc. The shield, in turn, helps control high-power devices. Generally, individually controlling the four relays in a relay shield requires Arduino code.
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