DollaTek 4 Channel 5v Relay Shield Module, Four Channel Relay Control Board Relay Expansion Board for R3 Mega 2560

• This relay module is 5V active low.
• It is an 4-channel relay interface board, which can be controlled directly by a wide range of microcontrollers such as For Arduino, AVR, PIC, ARM, PLC, etc.
• It is also able to control various appliances and other equipments with large current.
• Standard interface can be directly connected with microcontrollers.
• Red working status indicator lights are conducive to the safe use.

Description: 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 compatible the use of various types of motherboards, eliminating the patch cable troubles. Module features are as follows: Standard For Shield interfaces and shape Can continue to stack other For expansion boards M3 screw positioning holes for easy installation High Drive (5V or 3.3V) normally open contact closure 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: 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 includes: 1 x 4 Channel Relay Module