PWM Waveform Generation and Control Using Rotary Encoder on Spartan-3E Starter Board

The paper proposed the design and implementation of generation and control of a PWM waveform that has a changing duty cycle using rotary encoder. The model was developed and executed using various frequency values. The FPGA Spartan-3E board is used to generate the waveform which has built-in rotary encoder. The desired PWM signal can be generated by on-board signal and rotary encoder. By turning the encoder in a clockwise and anticlockwise direction, the duty cycle of the PWM signal can be changed. By pressing it up and down PWM signals of different frequencies are generated. In proposed design, the range of the duty cycle is 0 to 100%. The various frequencies have been produced by changing the on-board clock signal's frequency, which is 50 MHz. Oscilloscope is used to analyze the output. PWM signal is often used to control the power sent to electrical devices, such as motors, and has a variety of applications in fields such as communications, control systems, and power electronics. FPGA use enables high-speed operation, customizability, efficient resource utilization, reusability and low cost.