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Pico W Servo Controller

A simple, elegant web-based servo controller using the Raspberry Pi Pico W (or Pico 2 W) and MicroPython. Move a slider in your browser to rotate a servo connected to the Pico at 0–180°.

Features

  • Wi-Fi enabled web interface served from the Pico W
  • Responsive HTML slider (0–180°) with smooth update
  • Safe angle clamping
  • Clean PWM duty-cycle mapping for servo control

Hardware Required

  • Raspberry Pi Pico W / Pico 2 W
  • SG90 or any hobby servo
  • 5V power supply for servo
  • Jumper wires
  • Breadboard

Use common GND between servo power and Pico.

Wiring

Circuit Diagram

Servo Pin Connect To
Signal GP15
VCC 5V
GND GND

Setup

  1. Flash MicroPython firmware on Pico W
  2. Upload main.py and secrets.py
  3. Reset the Pico
  4. Watch serial output → find IP address
  5. Open IP in browser → control servo

How It Works

  • Pico starts an HTTP server on port 80
  • Browser slider sends: 
    GET /?value=90
  • Code extracts value
  • Converts angle → pulse width → PWM duty
  • Updates servo instantly

Servo pulse math:

SERVO_MIN_US = 500      # 0°
SERVO_MAX_US = 2500     # 180°
Period = 20,000 µs (50 Hz)
duty = (pulse_us / 20000) * 65535

Servo Calibration Tips

  • If servo doesn't reach 0° → decrease SERVO_MIN_US
  • If servo doesn't reach 180° → increase SERVO_MAX_US
  • Add 50 µs steps for smooth tuning

Troubleshooting

  • No WiFi: Check ssid/password, router range
  • Servo jitter: Use proper 5V supply + capacitor
  • Page not opening: Ensure phone/PC on same network
  • Socket errors: Reboot Pico

Security Notes

  • Use local network only (no internet exposure)
  • Add simple PIN authentication if needed

Future Improvements

  • Add presets (0°, 45°, 90°, 135°, 180° buttons)
  • Smooth tweening animation for servo
  • Real-time position feedback
  • Bootstrap UI / dark theme

Author

Kritish Mohapatra
MicroPython | ESP32 | Embedded Systems | IoT Projects
GitHub: [https://github.com/kritishmohapatra]