4 channel 5v relay shield module for Arduino UNO R3

Product Description:High Quality. Relay Shield (i.e. 5 V Quad Relay Module) is a small current signal control power equipment widely used electronic module, making high-power single-chip control devices are widely used in SCM system to create smart home project; and can be directly into the compatible with the use of various types of motherboards, eliminate the patch cable problems see Features Features : 1. Standard for Shield interfaces and shape 2. Can leave others in place for expansion boards 3. 3 M3 screw position holes for easy installation 4. High Drive (5V or 3.3V) normally open contact closure. 5. Onboard relay indicator (red) Special note: When using the For UNO board is connected to it, because UNO USB interface is extremely high, should avoid green terminals are scale. Relay Shield Interface: (the last image shows the last image) Relay: sky- 5V DC relay, model HJR-4102-L-5V, of which Relay1 is the 1st relay, the others and so on. Power Interface: 5V DC power interface Indicator: four lights are red when the relay is 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 , the NCx pin is normally closed, COMx is common, i.e., when the relay is not controlled, NOx and COMx open between two pins, NCx and COMx connection; When the relay (x) control signal pin is high drive relays, NOx and COMMA. connection open bed between NCx and Comx. Scope of delivery: 1 x 4 channel 5 V relay shield module 2 x HJR 4102 L 5V relay