Grove - Buzzer

Buzzer-modulen har en piezo-summer som huvudkomponent. Piezoen kan anslutas till digitala utgångar och kommer att avge en ton när utmatningen är hög. Alternativt kan den anslutas till en analog pulsbreddsmoduleringsutmatning för alstring av olika toner och effekter.

Kompatibilitet

• Arduino
• Raspberry Pi

Port

Digital

Exempelkod

Arduino

Short:

Long:

<syntaxhighlight lang="C++" line>
/* Melody
 * (cleft) 2005 D. Cuartielles for K3
 * This example uses a piezo speaker to play melodies.  It sends
 * a square wave of the appropriate frequency to the piezo, generating
 * the corresponding tone.
 * The calculation of the tones is made following the mathematical
 * operation:
 *
 *       timeHigh = period / 2 = 1 / (2 * toneFrequency)
 *
 * where the different tones are described as in the table:
 *
 * note  frequency  period  timeHigh
 * c          261 Hz          3830  1915
 * d          294 Hz          3400  1700
 * e          329 Hz          3038  1519
 * f          349 Hz          2864  1432
 * g          392 Hz          2550  1275
 * a          440 Hz          2272  1136
 * b          493 Hz          2028 1014
 * C         523 Hz         1912  956
 *
 * http://www.arduino.cc/en/Tutorial/Melody
 */
int speakerPin = 3;                  // Grove Buzzer connect to D3
int length = 15; // the number of notes
char notes[] = "ccggaagffeeddc "; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 300;

void playTone(int tone, int duration) {
    for (long i = 0; i < duration * 1000L; i += tone * 2) {
        digitalWrite(speakerPin, HIGH);
        delayMicroseconds(tone);
        digitalWrite(speakerPin, LOW);
        delayMicroseconds(tone);
    }
}

void playNote(char note, int duration) {
    char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
    int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };

    // play the tone corresponding to the note name
    for (int i = 0; i < 8; i++) {
        if (names[i] == note) {
            playTone(tones[i], duration);
        }
    }
}

void setup()
{
    pinMode(speakerPin, OUTPUT);
}

void loop() 
{
    for (int i = 0; i < length; i++) 
    {
        if (notes[i] == ' ')
        {
            delay(beats[i] * tempo); // rest
        }
        else
        {
            playNote(notes[i], beats[i] * tempo);
        }

        // pause between notes
        delay(tempo / 2);
    }
}

Raspberry Pi

import time
import grovepi

# Connect the Grove Buzzer to digital port D8
# SIG,NC,VCC,GND
buzzer = 8

grovepi.pinMode(buzzer,"OUTPUT")

while True:
    try:
        # Buzz for 1 second
        grovepi.digitalWrite(buzzer,1)
        print ('start')
        time.sleep(1)

        # Stop buzzing for 1 second and repeat
        grovepi.digitalWrite(buzzer,0)
        print ('stop')
        time.sleep(1)

    except KeyboardInterrupt:
        grovepi.digitalWrite(buzzer,0)
        break
    except IOError:
        print ("Error")

Mer information

http://wiki.seeedstudio.com/Grove-Buzzer/