A PID Controller for Real-Time DC Motor Speed Control using the C505C Microcontroller

This paper presents a real-time DC Motor speed controller design using a microcontroller-based network system. The design architecture was developed using two Phytec evaluation boards each having an Infineon eightbit C505C-L microcontroller. The system detects the realtime speed of the motor using the sensor device and then transfers data to the first Phytec board’s microcontroller using serial communication. This data is processed and transferred to the second Phytec board’s microcontroller using a Controller Area Network (CAN) communication scheme. The second microcontroller uses the received data to calculate the real-time control value to monitor and keep the motor speed constant based on a command signal. Data is then transferred back to the first Phytec board’s microcontroller using CAN and is utilized to change the motor voltage such that its speed is constant. The importance of the proposed design architecture is its ability in controlling precisely the motor speed and/or direction especially when used in modern automobiles where the CAN protocol is quite popular. Moreover, the proposed real-time controller approach is based on the closed loop feedback error principle unlike the existing open loop designs. The paper details the system design and the experimental results that were obtained.