This 5V 4-Channel Relay Shield 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 shape2. Can continue to stack other For expansion boards3. 3 M3 screw positioning holes for easy installation4. High Drive (5V or 3.3V) normally open contact closure5. Onboard relay indicator (red)Relay Shield Interfaces:Relay: 5V DC relay, HJR-4102-L-5V,Power Interface: 5V DC PowerIndicator: 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.
