28 Jan '15, 12pm

Laser Trip Wire With Keypad Arming

Laser Trip Wire With Keypad Arming

Most of us have had a sibling that would sneak into our room to swipe a transistor, play your guitar or just mess with your stuff in general. Now there’s a way to be immediately alerted when said sibling crosses the line, literally. [Ronnie] built a laser trip wire complete with an LCD screen and keypad for arming and disarming the system. The brains of the project is an Arduino. There’s a keypad for inputting pass codes and an LCD screen for communicating if the entered code is correct or not. [Ronnie] wrote his own program using the keypad.h, liquidcrystal.h and password.h libraries. A small laser pointer is shined at a Light Dependent Resistor which in turn outputs an analog signal to the Arduino. When the laser beam is interrupted, the output voltage drops, the Arduino sees that voltage drop and then turns on the alarm buzzer. The value that triggers the alarm is set m...

Full article: http://hackaday.com/2015/01/28/laser-trip-wire-with-keypa...

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Arduino Laser Trip Wire - #arduino

Arduino Laser Trip Wire - #arduino

electronics-lab.com 08 Feb '15, 8am

by ronnietucker @ instructables.com: So, first thing I did was to get the LCD and keypad working together. For this I pret...

Another Trip to España!

Another Trip to España!

theshoesnobblog.com 02 Feb '15, 11am

I just touched down in Madrid, heading to the factory that does the handstitching on our apron vamps and to see about crea...

#2NE1's Minzy sharpens her dance skills on her US trip.

#2NE1's Minzy sharpens her dance skills on her ...

xin.msn.com 28 Jan '15, 1am

While most people would usually choose to stroll around places or try new food on trips, 2NE1′s youngest member, Minzy, pr...