Classic Controller analog triggers and sticks have jitter and range issues

Expected Behavior

Classic Controller triggers read 0 when unpressed and 1 when pressed. Analog sticks reach full range and do not jitter.

Current Behavior

On my controller, the left trigger is unable to reach 0 (minimum of around 0.13), with a maximum below 0.9. Strangely, with the shell on, the right trigger can reach 0 (sometimes, other times 0.04) and 1, but with the shell removed, f i move the sliders to their maximal positions, both can't exceed a range of 0.04 to 0.92.

My left analog stick can't quite reach full left (-0.95-96), while my other cardinals range from 0.97-98 to 0.99x. Ideally it would be possible to calibrate the stick range so all cardinals can output a full ±1.00 or within a rounding error of.

Additionally both analog sticks (and sometimes triggers) have jittering positions even when I don't touch the sticks.

• I checked for jitter using https://hardwaretester.com/gamepad, and ranges using that and Dolphin Emulator.

Context

• GP2040-CE_0.7.11_Pico.uf2
• Stock firmware, configured with force_webconfig.uf2 and Classic Controller addon
• Pi Pico 1 RP2040 from raspberrypi.com
• See https://discord.com/channels/1049366310389289001/1049370085413888111/1402518913857622068 and below.

Steps to Reproduce

1. Wire Classic Controller to Pi Pico I2C pins using WiiChuck adapter.
2. Enter web UI using force_webconfig.uf2 and setup keybinds.
3. Try to calibrate controller.

Screenshots & Files

Please include any relevant screenshots, photos/recordings, or files here.

https://github.com/user-attachments/assets/e150ee8c-42d3-439c-8123-ae45c865850b