Description:

• This is a 5V, 10A 2-Channel Relay interface board.
• It can be used to control various appliances, and other equipments with large current.
• It can be controlled directly with 3.3V or 5V logic signals from a microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).

Parameters:

• High current relay, AC250V 10A, DC30V 10A
• 2 LEDs to indicate when relays are on
• Works with logic level signals from 3.3V or 5V devices
• Opto isolation circuitry
• PCB size: 50 x 41 x 18.5 mm
• With 4 fixed bolt holes, hole 3.1mm, spacing 44.5x35.5mm

Module interface:

• DC+: connect the power positive 5V
• DC-: the negative pole of the power supply
• IN1:1 circuit signal trigger terminal, can set high or low level control relay attract
• IN2:2 circuit signal trigger terminal, can set high or low level control relay attract

Relay output:

• NO1:1 road relay normally open interface, the relay before hanging, suspended, and after the short connection with the COM1
• COM1:1 road relay common interface
• NC1:1 road relay normally closed interface, before the relay is pulled in, short connection with COM1, left after attracting
• NO2:2 road relay normally open interface, the relay before hanging, suspended, and after the short connection with the COM2
• COM2:2 road relay common interface
• NC2:2 road relay normally closed interface, before the relay is pulled in, short connection with COM2, left after attracting.

High level trigger select end:

• S1 for 1 way relay, high and low level trigger selection;
• S2 for 2 way relay, high and low level trigger selection;
• When the com is shorted to the low, the corresponding relay is triggered at a low level, and the high is shorted to the high level when the com is short circuited

Ex with Arduino: 

Choose low activation. At S1 jump connected to Low.  

Schematic: