Why Standard Browser Testers Cannot Read Gyroscope Telemetry
Virtually all generic gamepad testers on the web rely solely on the browser's standard navigator.getGamepads() API. While sufficient for face buttons and analog thumbstick potentiometers, the standard Gamepad API completely omits 6-axis IMU (Inertial Measurement Unit) sensors like gyroscopes and accelerometers.
Our motion diagnostic engine uses the modern WebHID API to communicate directly with Sony DualSense (PS5), DualShock 4 (PS4), Nintendo Switch Pro, and Joy-Con microcontrollers. By sending specific hardware feature report packets, we wake the sensor pipeline and read raw 16-bit gyroscope samples at full device report rates (up to 1000Hz over USB).
Stationary Drift Measurement
Micro-Electro-Mechanical Systems (MEMS) gyroscopes inside gamepads measure rotational velocity ($\text{deg/s}$). Because of thermal fluctuations and manufacturing variations, every gyro exhibits a slight bias (zero-rate level). If this bias exceeds $\pm 0.5^\circ/\text{s}$, your in-game crosshair will slowly drift during gyro aiming. Our 60-second stationary drift test calculates your exact hardware offset per axis.