Another Arduino Laser Tripwire

Step 2 Build the Circuit

Connect the peizo's positive wire to pin 11 via a 10k resistor and ground wire to ground on the breadboard.
Connect one leg of the photocell to the 5v pin on the arduino.
Connect the other leg to analog pin 0 AND to ground on the breadboard via the second 10k resitor.
Connect ground on the breadboard to ground on the arduino.
Plug the battery (I used 12v because that was what was to hand) into the arduino power jack when you want to use it away fronm the computer but to get it up and running it can take power through the USB for now.
Strap it all together with an elastic band.

If using a laser emitter wire it to a 3v battery pack and add lots of blu-tac to make aiming it easier later on.

Comments

[gaurangb]

dear from where i will get circuit for install photosell and buzzer to dedtect beam braking conditions. [e-mail]