Gary Neal wrote:
>Hello,
>
>        I've got a 16f870 that I'm using to turn a relay (Tyco V23105 150 mW
>Nominal Coil Power, 960 ohm, 12 volt Nominal Coil Voltage) on/off.  This
>relay is controlling a very small DC motor (~0.5amps).  About 10% of the
>time when this relay turns on/off, it resets the PIC.  I've verified this
>is what's happening.  Seems to work fine when the motor isn't connected to
>the relay.  Only resets when the motor is connected.
.......


Sounds like you need a suppressor across the relay "contacts", or
better yet at the motor itself. Since a DC motor, try a reverse
diode there or a snubber - 10-100 ohm resistor in series with a
0.1 uF cap across the motor winding. The cap should be better
quality than simple low-V ceramic. 200V or so polypropylene.

- dan michaels
www.oricomtech.com
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