User manual

www.sainsmart.com

int jdqPin=13;

void setup()

{

pinMode(jdqPin,OUTPUT);

Serial.begin(9600);

}

void loop()

{

digitalWrite(jdqPin,HIGH);

delay(1000);

digitalWrite(jdqPin,LOW);

delay(1000);

}

Here I introduce how to use multimeter test relay pin.

General relay has housing mark. If not, is also very simple test with a multimeter:

 5V power supply

 Multimeter

1. Find the coil pins

Use multimeter to measure the resistance between the pins. The value of which 2 feet is in

hundreds to 1 k ohm resistance are coil pins. Note some of the relay coils are positive and

negative, the reverse may not damage, but no action.

2. Find the NO (normally open) contact, NC (normally closed) contact.

Use multimeter measuring four pins, which two pins breakover are NC contact, coil with 5v

direct current, the relay action, they should be disconnected; If there is no disconnect, the

internal relations is short sub.

Add 5v direct current to coils, make the relay action, this time test with a multimeter, if that

two pins which disconnect before but connect this time, they are NO contact.

The pins which have something to do with NO contact, and have something to do with NC

contact, is common port.