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thanks a lot Owain, for the link. If i can find the hardware used to make that, it will greatly help me with my project so i'll look into it. Also, hoover, i think making it so that it reacts when the beam is broken will be harder. i think the sonar method is more practical here.

Hello, I'm totally new to DIY and I'm making a very basic alarm system from scratch. I would rather not be specific about the details but I basically need to make a rig which continously sends out sound signals and if the signal bounces off anything in its range (kind of like a radar), makes...