Data Sheet

J1 Interface:
COM1- Common pin
NC1- Normally Closed. Will be connected with COM1 when RELAY1 pin is set low and disconnected when
RELAY1 is high;
NO1- Normally Open. Will be connected with COM1 when RELAY 1 pin is set high and disconnected when
RELAY1 is low;
J2-4 Interface are similar to J1 interface, except that the control ports are RELAY2-RELAY4.
4 Digital Pins to control 4 Relays: RELAY1-RELAY4 pins could be connected directly with Arduino pin
number of 7-4, so that four relays could be easily controlled by the Arduino
Usage
The relay have some practical application. For example: low-voltage control of high voltage; remote control;
anti-hearing alarm, automatic temperature alarm; incubators and so on. Application schematic is shown below: