Compact 3D Object Scanner with RPLidar

  • This project is a compact 3D scanning system I built for small objects using an RPLidar, an Arduino-controlled stepper motor, and a custom 3D-printed turntable. As the object rotates in precise increments, the lidar collects full 360-degree distance data that can be used to reconstruct its geometry.

  • The scanner is housed in a self-contained enclosure designed to keep the process consistent and largely hands-free. Once running, the system rotates the object automatically and records spatial data without needing constant manual adjustment. I built it as a way to explore low-cost 3D scanning through a combination of custom fabrication, electronics, and sensing.

  • The project reflects a broader interest of mine in building technical systems from the ground up and using accessible components to make useful tools. In this case, the goal was to create a compact platform for scanning small parts, models, and prototypes in a repeatable way.

Connection Table

Component Pin Connects To
CNC Stepper Driver PUL+ (STEP+) Arduino Digital Pin 3
PUL− (STEP−) GND
DIR+ Arduino Digital Pin 4
DIR− GND
ENA+ (optional) GND or Digital Pin 5
ENA− (optional) GND
Stepper Motor (NEMA 23) A+ / A− Connect to one coil (check motor datasheet)
B+ / B− Connect to the other coil
Power Supply V+ 24–48V DC Positive
V− Power Supply GND
RPLidar A1/A2 VCC 5V (Arduino or USB)
GND GND
TX Arduino RX (via level shifter)
RX Arduino TX
MOTOR CTRL (optional) Arduino PWM (e.g. Pin 6) or leave unconnected