Tiny LiDAR Rangefinder

Adu_Echo ordered a new TF-Luna LiDAR module for a build contest, with the idea that it could be implemented to track his kid’s remote control toy car. While this application work out per the car’s not-quite-straight operation and the limits of the LiDAR’s two-degree field-of-view, he was able to make a delightfully tiny rangefinder unit with the help of recycled parts.

The circuit, as described in this project write-up, is quite simple, consisting of the TF-Luna module, an STC8F1K08 MCU for control, and a 128x32 I2C OLED display. Other components used include a Micro USB connector recycled from a Bluetooth earpiece, and an LED, button, and charging IC from a face wash tool. Harvesting these parts and properly attaching them together would, of course, vary depending on what’s available.

Instead of buying or 3D printing an enclosure, Adu_Echo (2D) printed a pattern on paper, and used this to cut and bend drink can into shape. It’s a rather impressive feat of bending and flattening, though as noted, you’ll want to use gloves if you try something similar. The edges can be quite sharp.

The device is programmed to take measurements 10 times per second, and it averages five readings when calculating the output for improved accuracy. The result is a LiDAR range measurement unit that can easily fit in your pocket, and measures distances up to 8.9 meters.