A simple, browser-based tool to help you accurately tension the belts on your 3D printer using your device's microphone.

When I was tensioning the belts on my Prusa Core 3D printer, I ran into a frustrating problem: none of the existing tools seemed to work for me. The official Prusa app wasn't compatible with my phone, and the web-based solutions I found gave strange and unreliable readings, often showing bizarre values like --121Hz.

I needed a straightforward, reliable tool that just worked. So, I built this.

This project is a simple, no-fuss belt tension meter that runs directly in your web browser. It listens to the sound of your belt being plucked and provides a clear frequency reading, helping you dial in the perfect tension.

• Real-time Frequency Analysis: Get instant feedback as you adjust your belts.
• Visual Gauge: A simple visual indicator helps you see if the tension is too loose, too tight, or just right.
• No Installation Needed: Runs entirely in your browser.
• Simple & Clean UI: UI: No distractions, just the information you need.

The tool uses the Web Audio API to access your microphone and analyze the incoming audio stream. It performs a frequency analysis to find the fundamental frequency of the sound produced when you pluck the belt.