Piezo with an Arduino & photoresistor

Short video (m4v) of a piezo, photoresistor and Arduino….

Pt 1951
Here’s the breadboard view to wire this up yourself…

And.. here’s the code we used from TodBot!

 
 
int photosensorPin = 0;
int piezoPin = 9;

int val = 0;

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

void loop() {
  digitalWrite(piezoPin, LOW);
  val = analogRead(photosensorPin);
  val = val/2;

  for( int i=0; i<500; i++ ) {  // play it for 50 cycles
    digitalWrite(piezoPin, HIGH);
    delayMicroseconds(val);
    digitalWrite(piezoPin, LOW);
    delayMicroseconds(val);
  }
}

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5 Comments

  1. MikeD
    May 20, 2009 at 2:37 pm

    Cool little project. I just bought a photoresistor but didn’t know what to do with it. I’ll try this soon!

    Also: how did you do the breadboard/Arduino diagram? From scratch or is there a template that can be used with other software?

  2. adafruit
    May 20, 2009 at 2:57 pm

    check out fritzing.org – that’s how we make the diagrams.

  3. Len
    May 20, 2009 at 4:26 pm

    It looks like the source code was accidentally mutilated.

  4. adafruit
    May 20, 2009 at 5:28 pm

    fixed – we were adding some new formatting.

  5. Jon
    May 21, 2009 at 11:23 pm

    The “for” Loop needs to be updated with “piezoPin” instead of “speakerPin” in the digitalWrite elements.

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Filed under: Adacast, arduino, projects — by adafruit

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