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HELP: To Drive DC motor and get it feedback, uning PID FPGA

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koolslash

koolslash

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dc motor fpga

If anybody can tell me how to measure the speed or rpm of a DC MOTOR. if i m giveing the digital PID controller output to PWM and then driving DC MOTOR TO CONTROL SPEED.now i am stuck at giving back the feedback to the controller.
i have few ideas:
:idea:1. use LDR and LED circuit to measure pulses generated at diffent frequecy and use freq to Volt converter and give it to ADC which will give me a digital output for PID controller.

:idea:2. use R & C accross the DC MOTOR to calculate frequecy and follow the same procedure...

NEED YOUR HELP!!!! ASAP :cry: :cry:
 

sir if you have solved this problem kindly let me know how you did it i am in a same type of problem
 

You may have to add an encoder to measure the position or calculate the speed. Here you find some application examples with magnetic or optical encoder: iC-Haus Homepage - Applications: Application Guide .
The principles are shown here: **broken link removed**

Enjoy your design work!
 

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