Servo jitter, shake. xiao nrf52840 sense

[msfujino]

@PJ_Glasso

So I don’t like the schematic you show,
How can you connect 3.3V INTO the Xiao when it’s an OUTPUT?
here is the chunk from the schematic

Hi PJ,
Judging from the video posted by OP, the level converter used is probably a slow level shifter for I2C consisting of FETs and pull-up resistors. The wiring from the XIAO’s 3V3 pin to the level converter is probably to supply 3.3V to the 10k pull-up resistor on the board.

I’m not sure whether the servo OP is using is for a single cell or a dual cell, but if it’s for a single cell, the voltage may be too high in a series battery, causing excessive servo gain and vibration.