✍ Relay Shield (ie 5V Quad less module) is a small current power signal control equipment commonly used
electronic module, which allows single-chip high-power control devices are widely used in the SCM system to make project smart home; and the use of various types of motherboards can be inserted directly into the Arduino, eliminating patch cable problems.

✍ Note: Only four Arduino Digital I/O pins, pins 4-7, are required to control the four different relays. Additionally, the 5V and two GND Arduino pins are also required to power up the Relay Shield.

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▼ Features:
Arduino Uno/MEGA/Leonardo compatible; Other board or microcontroller via jumper cables
Three M3 screw positioning holes for easy installation
High units (5V or 3.3V) closing of the normally open contact
Interface via digital I/O pins 4,5,6, and 7
Relay screw terminals
Standardized shield shape and design
Onboard LED indicator working status indicators for each relay
COM, NO (Normally Open), and NC (Normally Closed) relay pins for each relay

▼ Specifications:
Power consumption: 180mA each relay contact
Maximum switching voltage per channel: 125VAC / 24VDC
Maximum switching current per channel: 3A
Dimensions: 7.6 x 1.3 x 0.5 cm

▼ Occupied Arduino Pins
Digital 4 – controls RELAY4’s COM4 pin (located in J4)
Digital 5 – controls RELAY3’s COM3 pin (located in J3)
Digital 6 – controls RELAY2’s COM2 pin (located in J2)
Digital 7 – controls RELAY1’s COM1 pin (located in J1)

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▼ Contact relay
COM1 (Common Pin) : The relay pin controlled from the digital pin.
NC1 (Normally Closed): This terminal will be connected to COM1 when the RELAY1 control pin (Digital 7 I/O pin) is set low and disconnected when the RELAY1 control pin is set high.
NO1 (Normally Open): This terminal will be connected to COM1 when the RELAY1 control pin (Digital 7 I/O pin) is set high and disconnected when the RELAY1 control pin is set low.

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