HC-SR501 Motion Sensor usually known as the PIR sensor is used in many kinds of Security Alarm Systems and Motion Detector systems. Instead of emitting infrared signals, it absorbs IR signals and that’s why it is called PIR (Passive Infrared) Sensor.
Raspberry Pi 4 is the improved version of Raspberry Pi 3 B+. Raspberry Pi 4 comes with Cortex-A72 quad-core processor running at 1.5GHz with memory bumped up to the LPDDR4. It has three times better processing performance and speed than the Raspberry Pi 3.
There are many kinds of Wi-Fi door lock available in the market which makes your home more secure and saves time in finding the keys. We previously built a smartphon
CCTV cameras are very common now days and they are good tool to monitor and surveillance the home or office for any mishapenings. But still IP cameras, which provide video feed accessible from anywhere, are costlier.