Modulo rele 12vdc 1 canal shield

Especificaciones

12V 1-Channel Relay interface board, and each one needs 15-20mA Driver Current & 5mA trigger current
Equiped with high-current relay, AC250V 10A ; DC30V 10A
Fault-tolerant design, even if the control line is broken, the relay will not trigger accidently
Standard interface that can be controlled directly by microcontroller & Alarm system
Full screw terminal for ease installation & secure connection
Indication LED’s for Relay output status (Red color) & Power (Green color)
High / Low input signal trigger selection by jumper. Support NPN / PNP PLC extension / Selectable Positive / negative trigger signal.
Dual side printed FR-4 PCB for Stable high current as in specification
Manufacturer under IPC-610 standard for stable & durable
4 mounting hole for easy installation
Hole diameter: 3.1mm
Distance between holes: 44.5mm x 20.5mm
Dimensions: 5.0 cm x 2.6 cm x 1.85 cm)
Terminals:

DC+ Power supply Positive 12V DC
DC- Power supply Negative 0V DC
IN: Signal Input Can be TTL High / Low depends on jumper setting
NO: Dry contact normally Open
COM: Dry contact Common
NC: Dry contact normally Close
High / Low Level TTL Trigger setting:

High level trigger: Short the Pin HIGH & COM
Low level trigger: Short the Pin LOW & COM

Sample code:
void setup(){
pinMode(7,OUTPUT);
}
void loop() {
digitalWrite(7, HIGH);
delay(2000);
digitalWrite(7,LOW);
delay(2000);
}