Piezo buzzers are used for making beeps, tones and alerts. The once we have in hackSpace are little but loud! Drive it with 3-30V peak-to-peak square waves. To use, connect one pin to ground (either one) and the other pin to a square wave out from a timer or microcontroller. For the loudest tones, stay around 4 KHz, but they do work quite well from 2KHz to 10KHz.
Wiring the buzzer is very simple you only have a positive and negative. The positive would be connected to one of the digital pins on your Arduino, the tone values will be transmitted though the buzzer.
/*http://kingstonhack.spacepiezo buzzer digital trumpet*/int freqs[] = {1915,1700,1519,1432,1275,1136,1014,956}void setup() { // put your setup code here, to run once: pinMode(11,OUTPUT); pinMode(3,INPUT);//first valve pinMode(4,INPUT);//second valve pinMode(5,INPUT);//third valve pinMode(6,INPUT);//extra button for embrasure}void loop() { // put your main code here, to run repeatedly: //====================C if(digitalRead(3)==LOW&&digitalRead(4)==LOW&&digitalRead(5)==LOW&&digitalRead(6)==LOW){ tone(0); } //====================D if(digitalRead(3)==HIGH&&digitalRead(4)==LOW&&digitalRead(5)==HIGH&&digitalRead(6)==LOW){ tone(1); } //====================E if(digitalRead(3)==HIGH&&digitalRead(4)==HIGH&&digitalRead(5)==LOW&&digitalRead(6)==LOW){ tone(2); } //====================F if(digitalRead(3)==HIGH&&digitalRead(4)==LOW&&digitalRead(5)==LOW&&digitalRead(6)==LOW){ tone(3); } //====================G if(digitalRead(3)==HIGH&&digitalRead(4)==LOW&&digitalRead(5)==HIGH&&digitalRead(6)==HIGH){ tone(4); } //====================A if(digitalRead(3)==HIGH&&digitalRead(4)==HIGH&&digitalRead(5)==LOW&&digitalRead(6)==HIGH){ tone(5); } //====================B if(digitalRead(3)==HIGH&&digitalRead(4)==HIGH&&digitalRead(5)==LOW&&digitalRead(6)==HIGH){ tone(6); } //====================C if(digitalRead(3)==LOW&&digitalRead(4)==LOW&&digitalRead(5)==LOW&&digitalRead(6)==HIGH){ tone(7); } } void tone(int frequency){ digitalWrite(11,HIGH); delayMicroseconds(frqs[frequency]); digitalWrite(11,LOW); delayMicroseconds(frqs[frequency]); }