4-Channel 5V Relay Module Expansion Board for Arduino



http://dx.com/p/arduino-4-channel-5v-relay-module-expansion-board-137109

// the setup routine runs once when you press reset: void setup { // initialize the digital pin as an output. pinMode(2, OUTPUT); // relay 1 pinMode(3, OUTPUT); // relay 2 pinMode(4, OUTPUT); // relay 3 pinMode(5, OUTPUT); // relay 4 }

// the loop routine runs over and over again forever: void loop { digitalWrite(2, HIGH);  // turn the relay 1 on (HIGH is the voltage level) delay(1000);              // wait for a second digitalWrite(2, LOW);   // turn the relay 1 off by making the voltage LOW delay(1000);              // wait for a second digitalWrite(3, HIGH);  // turn the relay 2 on (HIGH is the voltage level) delay(1000);              // wait for a second digitalWrite(3, LOW);   // turn the relay 2 off by making the voltage LOW delay(1000);              // wait for a second digitalWrite(4, HIGH);  // turn the relay 3 on (HIGH is the voltage level) delay(1000);              // wait for a second digitalWrite(4, LOW);   // turn the relay 3 off by making the voltage LOW delay(1000);              // wait for a second digitalWrite(5, HIGH);  // turn the relay 4 on (HIGH is the voltage level) delay(1000);              // wait for a second digitalWrite(5, LOW);   // turn the relay 4 off by making the voltage LOW delay(1000);              // wait for a second }