In a recent YouTube video, Koshiro – a fourth year student from Hiroshima University shows how to transform your basic SG90 RC Servo Motor into a fully functional Smart Servo with advanced capabilities. Powered by an STM32 microcontroller, this upgrade replaces the generic motor driver board that we see in servo motors by adding a custom made driver board that includes PID control, lowpass filtering, and I2C communication to provide smooth and vibration-free movements.
This Smart Servo Driver not only enables precise control but also allows you to read real-time data such as angle, speed, and torque. Through I2C communication, you can fine-tune parameters like PID gains, lowpass filter settings, and maximum torque using a Raspberry Pi or Arduino. The STM32 microcontroller ensures consistent hardware PWM, eliminating vibration issues caused by software PWM, making it ideal for slow-speed operations.
The circuit design incorporates robust components, including a TL431 shunt regulator for precision voltage reference, an LP2900 voltage regulator, and a dedicated motor driver IC to amplify PWM signals. The carefully designed PCB features noise-resistant routing and a large ground plane for stable operations. The project also leverages USB PD for multi-servo control, enabling up to three motors to function simultaneously.
The accompanying GitHub repository includes all manufacturing files, programs, and design details, enabling anyone to recreate and experiment with this project. Whether you’re into robotics or DIY projects, this upgrade can make your SG90 Servo motors a lot more easier and reliable.
