Youmile 4 channel 5v relay shield module for Arduino UNO R3 Relay Shield Interface 4 Four Channel For PIC AVR DSP ARM MCU Arduino UNO R3

• Standard for Shield interfaces and shape
• Can continue to stack other for expansion boards
• 3 M3 screw positioning holes for easy installation
• High Drive (5V or 3.3V) normally open contact closure
• Onboard relay indicator (red)

Description: 100% brand new and high quality Relay Shield (i.e. 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 compatible the use of various types of motherboards, eliminating the patch cable troubles. Features: 1. Standard for Shield interfaces and shape 2. Can continue to stack other for expansion boards 3. 3 M3 screw positioning 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 connected to it, because UNO USB interface is extremely high, should avoid green terminals are shorted its shell. Relay Shield Interface: (the last picture show) 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. Package included: 1 x 4 channel 5v relay shield module 2 x HJR 4102 L 5V relay