WSM – A Wireless Speedometer is a model railroad car which measures speed of a train and transmits it via Bluetooth. It is developed as a fully opensource and openhardware project. This page contains basic info about the project.

Photo of a WSM.

Features

• Speed-measuring based on opto-sensor.
• Very small electronics (Size 50×18 mm).
• Transmits data via bluetooth to any device.
• No external power supply is required (no current from tracks).
• Runs on battery, can measure up to 8 hours based on chosen battery.
• Integrated charging circuit.
• Charging from a micro-USB connector.
• Embedded ON/OFF switch.
• Measuring of a battery level & undervoltage protection.
• Simple & multiplatform desktop client application.
• Fully opensource & openhardware solution.