Happy Halloween from Adafruit! Check out some scary #electronichalloween posts, the frightening Halloween section and spooky videos!

May 19, 2009 AT 10:53 pm

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// play it for 50 cycles
    digitalWrite(piezoPin, HIGH);
    delayMicroseconds(val);
    digitalWrite(piezoPin, LOW);
    delayMicroseconds(val);
  }
}


 

Check out all the Circuit Playground Episodes! Our new kid’s show and subscribe!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground”Adafruit’s Apps!



5 Comments

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

  3. It looks like the source code was accidentally mutilated.

  4. fixed – we were adding some new formatting.

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

Sorry, the comment form is closed at this time.