Day 19 Arduino Advent Calendar

First published at Tuesday, December 19 2017

 class= Let's Get Started with the Day 19 Guide!

Arduino Advent Calendar Day 19 - Laser Module!

Do not look into the Laser Module when it is powered on. Looking into lasers can cause permanent eye damage!

Today we're going to have a look at the laser module (for the purposes of build a laser trip wire)!

Remember lasers are dangerous and you should never look directly into a laser whilst it is powered.

A laser generates an intense beam of coherent (the photons are all moving in parallel) monochromatic light (the light is all the same wavelength).

The lasers we use, are a type of diode and when viewed really closely look similar to LEDs.

We can build a laser trip wire by pointing our laser at a light dependent resistor and measuring the change when an object cuts the beam.

Yup, enough talking about it let's go and build up the circuit over at !

  Let's Get Started with the Day 19 Guide!

We're happy to help!

If you find you're getting stuck with today's guide, hit up our team of highly trained Arduino ninjas on this forum thread.

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