Testare modul cu 2 relee folosind Arduino

   Pe piata exista un modul cu 2 relee care se alimenteaza la 5V, pentru a fi folosit cu Arduino.
   Pentru a verifica rapid functionarea unui asemenea modul, avand la dispozitie decat o placa Arduino si niste fire Dupont, am facut un mic montaj:

iar ca sketch, am folosit ca baza pe cel numit "Blink" din exemplele programului Arduino IDE.
   Am facut un filmulet, numit test placa cu 2 relee in care apare un Arduino Mega, care este conectat la fel (D8 si D9).

   Schema de conectare este

iar sketch-ul folosit este:

/*
  "Blink" is original sketch
 
  changed sketch by niq_ro for test 2 relay board
  http://nicuflorica.blogspot.ro/
  http://www.tehnic.go.ro
  http://www.niqro.3x.ro
  http://arduinotehniq.blogspot.com/
 */
 
// inputs for relays:
int pin1 = 7;  // D7 for relay 1
int pin2 = 8;  // D8 for relay 2

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(pin1, OUTPUT);     
  pinMode(pin2, OUTPUT);    
 digitalWrite(pin1, LOW);    // turn the relay 1 off by making the voltage LOW 
 digitalWrite(pin2, LOW);    // turn the relay 2 off by making the voltage LOW
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(pin1, HIGH);   // turn the relay 1 on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(pin1, LOW);    // turn the relay 1 off by making the voltage LOW
  delay(1000);               // wait for a second

  digitalWrite(pin2, HIGH);   // turn the relay 2 on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(pin2, LOW);    // turn the relay 2 off by making the voltage LOW
  delay(1000);               // wait for a second
}