Paul Kocialkowski's coding blog

Free software, programming and stuff

Arduindoor

Written by Paul Kocialkowski no comments

Quite a while ago, I bought some device with a laser pointer. I did lost it over time and eventually ran into it just a couple days ago. In the meantime, I bought an Arduino and started experiencing with it, especially with photo-sensitive resistors (photoresistors).

Installation So I wondered what kind of fun could come out of a laser + a photoresistor + an Arduino. Actually, it didn't take long to figure out what to do. Remember all the Mission: Impossible-like movies and shows, where people are to move into laser-secured rooms, without interrupting any of the laser beams? Well, that's pretty-much the idea I came up with: "securing" my room door with such things.

Setup The setup is pretty easy: the Arduino is on one side of the door, with the photoresistor and another 10k resistor that we need to have a changing voltage. The laser is on the other side of the door, directed right to the photoresistor and connected to the Arduino via a couple wires. So the general idea here is to make the Arduino power the laser and get the tension from the photoresistor (or the 10k resistor) a couple times every second. Here is a scheme:

Scheme

Here is a demo video of the Arduindoor system running (first time making an alarm ring, second time playing/pausing music) :


If you're interested in the idea, you can setup your own with the additional help of:

Rss feed of the category
Fatal error : type : 8192 message : Function utf8_decode() is deprecated file : /core/lib/class.plx.utils.php line : 843 See https://www.php.net/manual/en/errorfunc.constants.php about type of error ============================================================ Drop this plugin now for running PluXml and report to its author !!