MakerHawk Obstacle Avoidance Sensor Lidar Detector Tiny Lidar Module 0.1-12m Measurement Range Distance Resolution 1mm with UART and I2C Interface for Arduino, Pedestrian and Vehicle Detection

I think it's a best performing sensor module to detect approaching targets. I've used it with an Arduino to gauge distance of people approaching to turn on an LED, and compared to the HC-SR04 ultrasonic sensor or a PIR motion sensor. It works better! The arduino code referenced in the item description on github works great, because it not only gives a readout of the distance of an object, it gives the strength, which lets you determine whether it's just a small animal passing by or a more substantial object (like a human)

It simply does not work. Set up as described in pixhawk documentation, module is totally dead, what a waste of money.