help!-electrical noise problem
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i've been using the BASIC stamp 2 for a robotic sculpture. the stamp
is controlling a 12v dc gear motor, and a radio shack sampler which i
modified so that it's triggered by a relay. my program for the stamp
is working fine (i tested it with LEDs) but the sampler is being
triggered when i don't want it to be. i was told that this is
interference of electrical noise from the motor...any suggestions on
how to get around this problem?
dianefig@yah
is controlling a 12v dc gear motor, and a radio shack sampler which i
modified so that it's triggered by a relay. my program for the stamp
is working fine (i tested it with LEDs) but the sampler is being
triggered when i don't want it to be. i was told that this is
interference of electrical noise from the motor...any suggestions on
how to get around this problem?
dianefig@yah
Comments
> i've been using the BASIC stamp 2 for a robotic sculpture. the
stamp
> is controlling a 12v dc gear motor, and a radio shack sampler which
i
> modified so that it's triggered by a relay. my program for the
stamp
> is working fine (i tested it with LEDs) but the sampler is being
> triggered when i don't want it to be. i was told that this is
> interference of electrical noise from the motor...any suggestions
on
> how to get around this problem?
> dianefig@yah
Hi,
electrical noise can be tricky. There are two types in general. One
type is radiated noise, which can be fixed by either moving the
sampler a distance away from your motor and shielding the sampler
with an aluminum or metal box. The other type is conducted, this
noise which is conducted through the wires connecting to your sampler.
Using shielded wires will help but it is best resolved with an
electronic filter comprised of caps and inductor feeding the power
source to the sampler. It would help if you could use a scope to see
the noise level and frequency range. However you can try the following
just to see if it solves the problem:
<--- 100 mH ----> power source to sampler
| |
- 1 uf cap - 1 uf cap
- -
| |
<
> gnd
I am not quite sure what a radio shack sampler is or how your robotic sculpture
is set up but I know in rc cars most motors have a small value capacitor (.1 uf
or so) directly across their terminals to reduce spurious emissions. You can
also put a small capacitor (100pf) across the positve and negative terminals
wherever you have an ic: say for instance your stamp. It should be fine if you
leave it on the board of education because it is already properly bypassed but
if you have taken the stamp out and placed it into a breadboard you might want
to bypass it with the small capacitors. The other problem could be lead lengths,
if your board is 'sloppily' put together ie. 1 foot jumper cables connecting ic
pins this could also result in noise. I hope this at least gets you started on
something!
Have a good day!
-Randy Knutson
dianefig <dianefig@y...> wrote: i've been using the BASIC stamp 2 for a
robotic sculpture. the stamp
is controlling a 12v dc gear motor, and a radio shack sampler which i
modified so that it's triggered by a relay. my program for the stamp
is working fine (i tested it with LEDs) but the sampler is being
triggered when i don't want it to be. i was told that this is
interference of electrical noise from the motor...any suggestions on
how to get around this problem?
dianefig@yah
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trigger wires in close proximity to the motor?
dianefig <dianefig@y...> wrote: i've been using the BASIC stamp 2 for a
robotic sculpture. the stamp
is controlling a 12v dc gear motor, and a radio shack sampler which i
modified so that it's triggered by a relay. my program for the stamp
is working fine (i tested it with LEDs) but the sampler is being
triggered when i don't want it to be. i was told that this is
interference of electrical noise from the motor...any suggestions on
how to get around this problem?
dianefig@yah
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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Yahoo! - Official partner of 2002 FIFA World Cup
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trigger wires in close proximity to the motor?
dianefig <dianefig@y...> wrote: i've been using the BASIC stamp 2 for a
robotic sculpture. the stamp
is controlling a 12v dc gear motor, and a radio shack sampler which i
modified so that it's triggered by a relay. my program for the stamp
is working fine (i tested it with LEDs) but the sampler is being
triggered when i don't want it to be. i was told that this is
interference of electrical noise from the motor...any suggestions on
how to get around this problem?
dianefig@yah
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and Body of
the message will be ignored.
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