IVD Laser Based - Strip Reader

• IVD Laser Based - Strip Reader
  • Features
  • Two motion phases
  • Hardware
  • Demo

This project drives a stepper motor with a DRV8834 driver for an in-vitro diagnostic (IVD) device. The motor positions samples for laser scanning, with homing via an optical switch (GK152) and a controlled scan routine.

Features

• Homing: Uses a GK152 optical switch to find zero position, with automatic back-off.
• Microstepping: Configurable (default 1/16) for smooth motion.

Two motion phases

• Fast pre-scan positioning at 300 RPM
• Slow scan at 18 RPM for laser reading
• Button input (debounced) to start a scan sequence.
• Interrupt handling: Optical switch events stop the motor safely.

Hardware

• MCU: Arduino (tested with Arduino framework)
• Driver: DRV8834 stepper motor driver
• Motor: Nema 17 stepper motor
• Optical Switch: GK152 for homing detection
• Inputs: Push-button trigger

Demo

ivd_demo.mp4