Command explorer · Pico + FS90 bench

Understand the servo command

Predict what the starter controller will command, then inspect its sampled pulse trace one step at a time. This is a behavior model of the exact starter firmware logic—not a model of the servo mechanism.

Make a prediction

Choose a firmware scenario

Scenario

The button is released at boot, pressed from 0.10 s to 2.00 s, then released.

Your prediction

What is the first command after the press at 0.10 s?

1500 us (7.5% duty)10000 us (50% duty)No pulse until the next sample

On the real bench

Check this scenario on hardware

With external servo power off first, optionally check GP0-to-GND with a logic analyzer or oscilloscope and confirm a 1500 us first pulse within the bounded guide procedure.

Open the build guide Open the starter