Relay Shield (ie 5V Quad Relay Module) is a small current signal control power equipment commonly used electronic module, enabling high-power single-chip control devices are widely used in SCM system to make smart home project; and can be directly plugged into the Arduino compatible the use of various types of motherboards, eliminating the patch cable troubles.
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Module features are as follows:
| Standard Arduino Shield interfaces and shape. |
| Can continue to stack other Arduino expansion boards. |
| 3 M3 screw positioning holes for easy installation. |
| High Drive (5V or 3.3V) normally open contact closure. |
| Onboard relay indicator (red). |
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Special Note: When using the Arduino UNO board connected to it, because UNO USB interface is extremely high, should avoid green terminals are shorted its shell.
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Relay Shield Interface:
| Relay: sky- 5V DC relay, model HJR-4102-L-5V, which Relay1 behalf of the 1st relay, the other and so on. |
| Power Interface: 5V DC power interface. |
| Indicator: four lights are red when the relay is driven high, the corresponding indicator will light up. |
| Relay Terminals: Terminal high-power, high-current high voltage can be connected to the device . The 1st foot ( i.e. NOx) is a normally open pin, NCx pin is normally closed, COMx is common, i.e., when the relay is not driven, NOx and COMx open between two pins, NCx and COMx connection ; When the relay (x) control signal pin is high drive relays, NOx and COMx connection open between NCx and COMx. |
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