Advantages over normal infrared motion sensors a.k.a. PIR, is that it can sense reptiles and insects, it can also log the distance of the object, and it haves a range of 4 meters.
Step 1: Get the Parts
1 Gopro or any other camera
1 Ultrasonic Motion Sensor HC-SR04
1 100uF/25V capacitor
lots of rubberbands