servo/motor problem

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  1. - 10th February 2009, 16:19 #1
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    mackrackit
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    Are the batteries rechargeable? The total voltage could be with fully charged cells 4.8 to 6 volts nominal. One could be a bit low if you are running at 10MHz or above and the other is a bit high.

    The 4.8 v will be fine if nothing causes to much of a voltage drop. The batteries may seem fine after everything stops due to rebound. Try a voltmeter when it is running to monitor the voltage to see for your self.

    Solution might be to have a separate set of batteries for the PIC and another for the motors. Share the zero rail.

    If you are not running rechargables then a regulator is recommended for the PIC. Keep the voltage at 5 volts or less here. If you run the PIC at 4 MHZ or so the voltage can be much lower, check the data sheet under electrical characteristics. A low drop out regulator may also be handy. If the batteries are max voltage 4.8 and you run at 4 MHz then you will not need the regulator.

    This "science olympiad ", is this something with a secondary school or university ?
    Dave
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  2. - 10th February 2009, 16:34 #2
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    Acetronics2
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    Hi,Dave

    The internal resistance of those batteries is FAR too high to power a servo , so a servo and a Motor ...

    Want some values ??? just to laugh a bit ...

    running the PIC @ 3 v could be a solution ... for the Pic only !!!

    Alain
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  3. - 10th February 2009, 17:28 #3
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    Quote Originally Posted by Acetronics View Post
    The internal resistance of those batteries is FAR too high to power a servo , so a servo and a Motor ...
    eYup, I was not really thinking about the motors, more to the PIC browning out. Good point.
    Dave
    Always wear safety glasses while programming.
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