Arduino Servo Robotics Control

Project Description – 2-Axis Laser Pointer System for VLM

Background

I am managing the development of Vertical Lift Module (VLM) solutions within the Gonvarri Material Handling group, operating under brands such as Constructor and Dexion across Europe.

Our current VLM design uses a mechanically traversing light pointer moving approximately 4 meters across the pick opening. This solution is complex, costly, and maintenance-intensive. We are now looking to replace it with a compact, reliable, and lower-cost laser positioning system similar to competitor solutions.

Project Objective

Develop a 2-axis laser pointer system capable of accurately indicating pick positions inside the VLM opening using a single laser dot. The goal is to eliminate long mechanical traversing rails and replace them with a compact positioning system.

Scope of Work

• Mechanical design of compact 2-axis system
• Mounting concept for pick opening
• Modular approach
• Simple enclosure (low IP requirements)

• Servo-based positioning system
• Fast and smooth motion

• Single-point laser system

• Microcontroller-based control (Arduino or similar)
• Integration with existing PLC commands (activation, referencing, position, velocity, limits)

• Control software, motion smoothing, and geometry compensation
• Calibration method for accurate positioning

Key Requirements

Working area: up to 4000 × 820 mm
Accuracy: ±20 mm
Speed: full travel within ~2 seconds
Environment: indoor, low dust, room temperature
Operation: regular industrial use

System Concept

The system can be implemented using two compact laser units to cover the entire tray area. Even with two units, the solution remains significantly simpler, more cost-effective, and lower maintenance compared to the current 4-meter traversing mechanism. The design should be modular and scalable. Deliverables should include a fully working prototype design including hardware design.

Deliverables

• Mechanical design
• Component selection
• Control electronics concept
• Firmware / control logic
• Geometry compensation concept • Calibration procedure • PLC integration concept • Fully working prototype design including hardware design. Collaboration We are available for technical discussions via Zoom to finalize the concept, architecture, and integration approach. Goal To achieve a simpler, more robust, and lower-maintenance alternative to the current traversing light pointer system while maintaining sufficient accuracy for industrial picking applications.