Search found 19 matches

The PIC is being run off of a 10 MHz oscillator. The problem is simply that it is giving me bogus values. The values it gives are proportional to changes in speed, but are nothing resembling the RPM ...

I've been working on building a tachometer for a dc motor. The motor's axel has a gear with 24 teeth (24 teeth per revolution). The teeth go in between a photodiode and sensor. This creates a squar ...

I was wondering if it's possible to implement a 1Hz clock output on my 16F877 PIC without interfering with the code written below. The 1Hz clock output is somewhat unrelated to the rest of the progra ...

The solution was right under my nose. It required a gate drive. All is well now.

Given that the problem doesn't lie with my functions, the only thing I can think of is the connection of the PWM output to the switching transistors in the buck converter. If there is too high a dema ...

I've written the basic program architecture for a PIC 16F877 to control a buck converter. I tested this basic program with a potentiometer input and read the output with the oscilloscope. Everything ...

The PWM output is perfect now. Thanks for the tip.

I was finally able to get my PWM to operate at 100KHz, but now I'm observing some strange behavior. Currently, I am using a potentiometer to control the input to the PIC 16F877's ADC port. I scale t ...

That did the trick! Many thanks...

Right now, I'm drawing up an outline for my dc motor control. I was trying to compile this preliminary program, but I get error messages that say "A numeric expression must appear here" for ...

Does anybody have experience with rotary encoders for measuring a motor's rotational speed? I'm using a slotted-optocoupler as a rotary encoder to help me determine a dc motor's speed. The optocoupl ...

You guys were both dead on! I now understand the scaling factor and that works quite well. The 10bit adc seems to have fixed a lot of problems as well. Thank you.

thanks

I now understand why the PWM only accepts values from 0 to 19, but I'm not sure why the A/D converter returns a number 0 to 1023. I tried implementing the change with no success. The scope output is ...

Okay, here's a new problem. I've been informed that I need to output a 500KHz PWM signal, instead of a 20KHz signal. I manipulated the code a little bit and was able to get an output of 500KHz, but ...