Control a physical servo motor from multiple controllers:
- Raspberry Pi Pico (C) firmware driving the servo
- Android app that sends commands over the network (MQTT)
The goal of this project is to explore embedded control + mobile UI + messaging (MQTT) in one small, hackable setup.
- 🎛 Raspberry Pi Pico servo driver
- Uses the Pico SDK and PWM to drive a standard hobby servo\
- Designed to receive target angles from a queue / MQTT messages\
- Supports a simple mapping from logical angle (0--180°) to PWM duty cycle
- 📱 Android controller app
- UI to send control commands to the servo\
- Can be extended with sliders / buttons / presets (e.g. "Left", "Center", "Right")\
- Good playground for integrating MQTT or HTTP with Android
- ☁ Network control (MQTT-ready)
- Firmware prepared to integrate with an MQTT client module\
- Idea: publish angles from Android → MQTT broker → Pico subscribes and moves the servo
ServoControl/ ├── ServoCode/ # C firmware for Raspberry Pi Pico │ ├── CMakeLists.txt # Pico SDK build configuration │ ├── mqtt/ # MQTT-related headers/sources (WIP) │ └── ... # main servo logic, PWM, queue, etc. └── Android/ └── ControlServo/ # Android app project for remote control ├── app/ ├── build.gradle └── ...
- Raspberry Pi Pico or Pico W
- Standard hobby servo (SG90 / MG90S)
- External 5V power recommended
- Optional joystick module
- Pico SDK, CMake, arm-none-eabi toolchain
- Android Studio
- MQTT broker if using network control
git clone https://github.com/milutin2002/ServoControl.git
cd ServoControl
cd ServoCode
mkdir build && cd build
cmake .. -DWIFI_SSID=<wifi_name> -DWIFI_PASS=<wifi_password>
make
Flash the generated .uf2 to your Pico.
- Servo VCC → 5V\
- Servo GND → Pico GND\
- Servo Signal → PWM-capable GPIO (e.g., GP15)
Open Android/ControlServo in Android Studio.
No license yet --- consider MIT/Apache-2.0.
Milutin Jovanović