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4 Channel 5V Relay Module
Relay Shield (i.e. 5V Quad Relay Module) is a commonly used electronic module for controlling small current signals, making powerful single chip control devices widely used in SCM system to make smart home project; and can be directly connected to the use of various types of motherboards, eliminating patch cord problems.
1. Standard Shield interfaces and shape
2. Can continue to stack other expansion cards
3.3 M3 screw holes for easy installation
4. High drive (5V or 3.3V) normally open contact closure
5. Relay indicator on board (red)
Special Note: When using the UNO card connected to it, because the UNO USB interface is extremely high, avoid shorting green terminals in the shell.
Relay Shield interface:
Relay: sky-5V DC relay, model HJR-4102-L-5V, which relay1 on behalf of the 1st relay, the other and so on.
Power supply interface: 5V DC power supply interface
Indicator: four lights are red when the relay is driven high, the corresponding indicator will be on.
Relay Terminals: Terminal high-power, high-current high voltage can be connected to the device. The 1st foot (ie NOx) is normally open pin, NCx pin is normally closed, COMx is common ie when the relay is not driven, NOx and COMx open between two pins, NCx and COMx connection; When the relay control signal pin (x) is high, control relay, NOx and COMx connection open between NCx and COMx.