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Protect your space with this easy-to-build Laser Security Alarm! Learn how to use a laser diode, LDR (light-dependent resistor), ...

Water Level indicator 12th #science Project Medidor de Nivel de Agua #medidores #agua #proyectos #escolares ...

Want to build a simple wireless voltage detector? In this project, I'll show you how to make a wireless AC line detector using a ...