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    Re: PWM fan speed control with a 12F683

    You are so smrt. I mean smart.

    I assumed a DC fan would run slower at half of rated voltage and slower still at quarter of rated voltage. When I tried your test on my test fan, sure enough it...
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    Re: PWM fan speed control with a 12F683

    I didn't have a coil so I tried the cap across the motor and voila!

    Thanks.

    I still can't get the fan to do three speed steps it's either on or off. Any ideas?
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    Re: PWM fan speed control with a 12F683

    Using Sayzer's code, attached, I've been able to control an LED as desired.

    Coupling that to a larger current drawing device is a problem. Of the schematic page provided, the top drawing has...
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    Re: PWM fan speed control with a 12F683

    Ok forget about the FET and talk to me about the PWM signal. Should it be 5V pulses or 2.2V pulses? If 5V, what do I need to set to make it be that level?
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    Re: PWM fan speed control with a 12F683

    Got the program and got the circuit set up. It seems to work well with LEDs but feeding the output to a FET, at least the FET I'm using, won't trigger the FET.

    I looked at it with a scope and...
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    Re: PWM fan speed control with a 12F683

    I have a couple of questions I hope you'll answer so I can understand what's going on better.

    Why is it important to put the fan on gpio.2? I realize it's the "on-board pwm module" but what does...
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    Re: PWM fan speed control with a 12F683

    You are my hero. I've yet to try it but I really appreciate your help. Thanks
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    Re: PWM fan speed control with a 12F683

    Since you were able to provide an answer for that, do you have any ideas how I can run two outputs simultaneously but each at different output levels?

    What I want to do is have a switch turn on a...
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    Re: PWM fan speed control with a 12F683

    Thanks Sayzer,
    I've had some other issues to resolve before I finally got to try it today. It works fine and does exactly what I want to accomplish.

    I do have a few questions about how the...
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    PWM fan speed control with a 12F683

    Ladies and Gents,
    I'm trying to use a 12F683 to control a fan motor. I want to be able to push a button and have the fan cycle through speeds from off to high in 3 steps.

    The problem is I can't...
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