You could use a motion sensor as an added security in your next house project.

This sensor is based on infrared technology and can work by itself with high sensitivity and reliability. It uses only a small amount of power. It could run in 4.5V to 20V, and the output is 5V digital. The delay between readings is 8 seconds by default. The sensing distance of this sensor is within 3 meters and could work at a temperature of -20°C

to 80°C. To integrate with your MCU, you only need GND, VCC, Digital for the output.

You could use this module for projects like a motion-controlled lamp, home security, motion-sensing robot, and more.