This laser tripwire uses an Arduino, photoresistor, and of course a laser. There will be two main parts of the tripwire. The first part is the source which consists of a laser, switch, and a power source. The second part of the tripwire is the receiver. The receiver is controlled by the Arduino. It consists of the buzzer and photoresistor which measures the amount of light. If the laser is on the photoresistor then the Arduino will not sound the buzzer if the laser is not on the photoresistor then the buzzer will set off. The video below shows how to make the tripwire.
This relates to engineering because this build can help solve many problems such as privacy. An electrical engineer must have worked on this, to make the project.
