Summary of "Micropython - controlling a servo"

Micropython servo control tutorial

What the video covers

Introduction to hobby servos: small motors with a limited range (typically about 180°) used for short-range motion. A hobby servo contains a motor, a small microcontroller and a potentiometer for closed‑loop position feedback.
Control method: servos are driven with a PWM (pulse‑width modulation) control pulse. The MicroPython servo module converts desired angles into the appropriate PWM/duty values (the library handles the angle→PWM mapping).

Hardware / wiring

Power
- Connect the servo red wire to VBUS (5 V) on the Raspberry Pi Pico — do NOT use 3.3 V for reliable operation.
Ground
- Connect the brown (or black) wire to GND.
Signal
- Connect the control wire (usually white/orange/yellow) to a GPIO pin (the demo uses pin 16).
Note: powering the servo from 5 V is recommended for better torque and motion.

Warning: be careful with VBUS connections to avoid damaging other parts. When using multiple servos, test wiring incrementally and consider a dedicated power supply or proper decoupling to avoid brownouts and noise on the Pico.

Software / workflow (MicroPython on a Raspberry Pi Pico)

Copy the provided MicroPython servo module (from the raw link shown in the video) onto the Pico and save it as servo.py (lowercase).
Create a test script, e.g. servo_test.py, and import the module:
- from servo import Servo
Instantiate a servo object:
- s = Servo(pin=16)
- Optional constructor parameters: frequency, min_us, max_us, and degrees to match specific servo ranges.
Basic commands
- Move to endpoints: s.write(0) and s.write(180) (include time.sleep() between commands to allow motion).
- Sweep example:

import time
from servo import Servo

s = Servo(pin=16)

# sweep from 0 to 179
for i in range(180):
    s.write(i)
    time.sleep(0.02)   # adjust delay as needed

# sweep back
for i in reversed(range(180)):
    s.write(i)
    time.sleep(0.02)

Timing notes: too-short delays may prevent the servo from reaching target positions. Adjust sleep values (e.g., 0.01 s to 0.1 s per step) and include longer pauses as needed.

Implementation notes / tips

The servo module handles the angle → PWM duty calculation, so you do not need to compute PWM duty cycles manually.
Tweak frequency, min_us, max_us, and degrees in the Servo constructor to match different servo models and achieve accurate endpoint positions.
Test wiring and delays incrementally.
For multiple servos, pay attention to power supply capability and decoupling to prevent voltage drops or noise that can affect the Pico and servos.

Resources / files used

Servo MicroPython module (copied from a raw link into the Pico as servo.py).
servo_test.py example created on the Pico to demonstrate write and sweep operations.