Prueba de rueda del ratón — Verificar dirección, velocidad y encoder

A scroll wheel test measures the events generated by your mouse's scroll wheel as you rotate it. Each detent (the tactile click felt when the wheel rotates) should generate a consistent scroll event with a fixed delta value. Skipped detents, reversed direction events, or inconsistent delta values are signs of a worn or dirty rotary encoder.

Most desktop mice use either an optical encoder (a notched disc interrupting an LED beam) or a mechanical encoder (metal contact strips). Both wear over time, but mechanical encoders are more susceptible to dust, debris, and oxidation that cause the symptoms this test surfaces.

Scroll wheels are used hundreds of times per day — for browsing documents, code, web pages, and zooming in design or CAD software. A wheel that skips, reverses, or stutters is a constant productivity drag.

In games, the scroll wheel often binds to weapon switching, zoom, or inventory cycling. A misfiring wheel can cost you a fight. This test surfaces issues before they become permanent: a wheel that occasionally reverses direction today will likely reverse far more often after another month of use.

The test listens to the browser's wheel events, captured with a non-passive event listener so the page itself does not scroll. Each event provides a deltaY value (positive = down, negative = up) and a high-resolution timestamp via performance.now().

From these we compute total up/down distance in pixels, peak velocity (delta per millisecond), and a per-event log. Comparing the up and down distances after deliberate equal-length scrolls reveals whether the encoder is symmetric. Velocity and delta consistency reveal encoder health — a wheel with a worn detent will produce visibly different delta values for what should be identical rotations.

Compressed air: Aim a short blast into the gap around the wheel and rotate it while spraying. Dust is the cause of the majority of scroll-skip issues.

Contact cleaner: For mechanical encoders, a few drops of electronics-safe contact cleaner (DeoxIT D5) into the encoder, followed by rotating the wheel for 30 seconds, can restore reliable contact.

Replacement: Encoders are inexpensive (typically $1–3 for an Alps or TTC unit). Replacement requires desoldering the old encoder from the PCB and is feasible for anyone with basic soldering experience. Free-spin and high-resolution scroll wheels (e.g. Logitech MX Master) use proprietary encoders and usually require manufacturer service.