Programmable logic controllers are widely used in industrial automation systems to control machinery, monitor sensors, and manage manufacturing operations. Although PLCs provide reliable machine ...

Microwave Doppler sensors are used alongside pyroelectric infrared sensors as human presence sensors. They emit microwaves and detect moving objects from the burst signals (Doppler signals) reflected ...

The system detects motion after shop hours and activates an alarm with different alert levels. It also flashes LEDs, logs motion events, and is designed to support Telegram notifications when deployed ...