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'RE lock up PIC with motor'
2000\05\10@004640 by Gennette, Bruce

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As others have said it's the noise from the commutator being fed back
through the power lines to the PIC.

The motor DOES NOT need regulated power so long as it is feed with enough DC
power at around the correct voltage.

I think you would be better off to select a motor that suits your power
input (after the diode bridge, but before the power supply caps and
regulator and run the motor off a diode isolated, unregulated branch.  This
should remove all the motor noise from the PIC circuit and give a bonus of
better performance from the higher voltage and current the motor gets.
After the diode bridge use a large current diode from the +V line to the
relay contacts, then to the motor, then back through another large current
diode to the -V line.  When sizing the motor don't forget the 2 diodes will
take out 1.2-1.4V.

Use a courier or system font to view this ASCII diagram in proper
proportions


          Bridge      Diode          Relay        __Motor (7.7V)
             +9VDC                  /----        /  \
            /\-----\---|>|---------/  -------\-||    ||--/---\
           /  \    |                         |   \__/    |   |
~ ---------/    \   \----->                   |           |   |
~ ---------\----/       To PIC power supply   \----|<|----/   |
6.3VAC      \  /     /---->                                   |
            \/-----/---|<|-----------------------------------/
             -0V      Diode

DC electric motors often have wider than 50% tolerance, meaning a nominal 6V
one will perform well from about 3.5V up to 8.5V.  For the values shown you
should use a 6V motor and 3A 1N5404 diodes (or get a couple of high power
diodes from a wrecked car alternator).

Bye.

2000\05\11@132147 by mark

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> As others have said it's the noise from the commutator being fed back
> through the power lines to the PIC.
>
> The motor DOES NOT need regulated power so long as it is feed with enough DC
> power at around the correct voltage.
>

I solved a problem exactly like that by using separated power supplies
for the motor and the PIC circuit.

Even interconnecting the two GNDs rised the problem again.


Marcelo Puhl
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