DIY Laser Security with Arduino

DIY laser security systems often use an Arduino Uno, a laser diode module, and a light-dependent resistor (LDR). When the laser beam is interrupted, the LDR's resistance changes, triggering a buzzer alarm and/or an LED indicator. These systems can be expanded with GSM or Wi-Fi modules for remote alerts. The concept dates back to the early 1990s, but early versions were expensive and hard to monitor. Modern systems are cost-effective and simple to construct, making them popular for home security, lab safety, and school projects. They can secure doorways, hallways, or restricted areas. Despite their affordability and flexibility, Arduino-based security systems have vulnerabilities. These include weak encryption, susceptibility to denial-of-service attacks, and insecure hardware interfaces. Attackers can exploit these weaknesses to disrupt services, steal data, or gain unauthorized control. Alternatives to DIY Arduino security systems include Z-Wave options for smoke detection and combined Arduino/Raspberry Pi setups. Raspberry Pi's can be used for computer vision applications that Arduino's cannot handle. More complex systems use QR codes, keypads, and backend databases for authentication.