So one day you wake up and you think…why should I buy an alarm installation if I can just make my own. The normal answer is because you usually don’t have the skills nor the time for it. In my case I preferred the answer, because you can learn new skills and do cool stuff. Well that motivated me so here I am writing about how I build my first amateur laser alarm(which is far from finished). Keep on reading if you are curious about my first steps into the hardware world.