Spynet Laser Trip Wire
About this deal
If you are planning on protecting your staircase with the laser tripwire, then it is better to set it up as shown in the following example. It was quite lowtech: A small switch with really thin wires at the bottom of the door, an enclosure with some transistors, resistors, a capacitor an optocoppler hidden behind the fourniture and a special mouse with wires attached to the left key. Nominally this is used to send the keyboard command that hides all open windows, but we’re sure the imaginative readers of Hackaday could come up with all sorts of alternate uses for this capability. Despite the fact that security systems have evolved tremendously, it is always a good idea to constantly seek out new and innovative ways to keep our surroundings safe.
The Laser Doorway Tripwire is a great way of gaining supporting evidence and supporting your own observations. Ghz on the ISM band) and can be used to invisibly cordon off a door or hallway and fire a scripted action on your computer if its beam has been broken. Finally, laser trip wire alarms are a versatile and effective tool for safeguarding valuables and identifying intruders. Attaching the laser tripwire to a terminal gives additional options, such as arming and disarming all attached traps, or specifying who can trigger the tripwire.
While laser tripwires were exclusively stationary in previous games, Human Revolution also includes some that move back and forth, sweeping over entire areas.
Notwithstanding the fact that these devices have been available for some time, they are still poorly understood by the general public. A tripwire is a device triggered by physical movements, you can use it to detect people, animals, cars. Note that the relay should energized (and latched) when the laser beam does not shine on the photoresistor.
When the beam is broken, the resistance of the photoresistor drops and the input voltage goes to digital low. The laser beam is projected across an area and is disturbed when an intruder passes through it, resulting in an alarm. For the repeating loop, I wrote an IF/ELSE statement that continuously polls the photoresistor digital input. In this article you will learn how to build a laser trip wire out of inexpensive electronic components, and you will build two circuits – the laser beam sender circuit and the laser beam receiver circuit. It was received by an LDR connected to a video game controller button, so a PC could sense it (before I knew about microcontrolers).