Vol. 121, Issue 10, October 2010, pp.94-105

Embedded Based DC Motor Speed Control System

Chandrasekhar T., Nagabhushan Raju K., ¹V. V. Ramana C. H.,
Nagabhushana KATTE and Mani Kumar C.

Embedded systems Lab, Department of Electronics, Sri Krishnadevaraya University,
Anantapur -515 055, A.P., India

¹ Scientific Instrumentation Lab, Department of Instrumentation, Sri Krishnadevaraya University, Anatapur-515 055 A.P., India

E-mail: chandru_ele@yahoo.co.in

Received: 8 September 2010   /Accepted: 18 October 2010   /Published: 26 October 2010

Abstract: An embedded based DC motor speed control system using cygnal microcontroller (C8051F020) has been designed and developed. It is based on frequency domain technique. The principle is opto-coupler senses the speed of the motor in the form of TTL pulses, which is given to F/V (frequency to voltage) converter. The output of the F/V converter voltage is fed to an inbuilt 12-bit ADC of cygnal microcontroller. The converted digital value applied in Liner equitation for converting back to frequency and speed is displayed on two lines LCD in RPM. Microcontroller is applied for PID control action to correct error in the form of voltage to the motor through built-in 12-bit D/A converter, PWM circuit, and actuator. The present study discusses the design, development, fabrication, and analysis of cygnal microcontroller based PID logic controller for DC motor speed control systems. Software is developed in ‘C’ language using Si-Lab IDE C-cross compiler. The paper deals with the hardware and software details.

Keywords: Speed control, PID logic, Frequency to voltage converter and Cygnal Microcontroller based control

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