laser trip wire alarm

Attending: Les, Tony, Elizabeth, Keiran, Joe and Mike.

Les led another Arduino teach in session.
This week it was laser trip wire alarm system, using a light dependent resistor and a torch standing in for the laser. When the light beam is broken, the LED flashes and the buzzer sounds repeatedly.
The TV on the back wall goes off by itself after a couple of hours, and seems to be a temperature related fault. The following project could possibly be used to fix it.
A temperature sensor which turns on a fan when a set temperature is reached and off again if the fan reduces the temperature. 

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