Turning a buzzer on by pressing a push-button.

Introduction: The buzzer is a electronic device that makes a sound (a buzz) when the crystals in his interior are excited by electic current.

Components needed:

→ One push-button;

→ A Buzzer

Buzz

→ One 1k Ohm resistor;

→ Protoboard;

→ Jumpers.

1st Step:

On a Protoboard, assemble the circuit below:

Proto4

Where:

→ Red wires and black wires referes to VCC 5V and GND, respectively;

→ The Orange wire represents the signal received by Galileo when the push-button is pressed;

→ The green wire connects the buzzer to Galileo’s Digital 3.

Schematic

Schem4

2nd Step:

Upload the following code to Galileo, using the Arduino IDE or compiling directly from Linux terminal:
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26. 		    const int pinBuz = 3; //Buzzer Pin
    const int pinSwi = 2; // Push-button pin
       
    void setup() {
        Serial.begin(9600); // Opens Serial communication
        pinMode(pinBuz,OUTPUT); //Defines pinBuz as an Output
        pinMode(pinSwi,INPUT); // Defines pinSwi as an input
              }
    void loop () {
      int botao; // To save the last logic state of the button
      botao = digitalRead(pinSwi); //Put the reading value of the switch on botao
      Serial.println(botao); //Shows the logic state of the input on Serial Monitor
      if (botao == 1) // Pressed button, logic State HIGH (5V)
      {
      digitalWrite(pinBuz,1); //Switch pressed, buzzer on
      }else
      {
      digitalWrite(pinBuz,0); //If the switch isn’t pressed, buzzer off.
      }
      delay(10); //reading delay
                }