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PICList Thread
'Looking for a AC Current sensor'
1997\03\27@155525 by sdavidson

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I went through my old PIC messages and can't find a reference to one, but I
know I have seen one.  I need to sense if a motor is still running (current
through my relays on my PC board.)  Someone must make a PC board mountable
on/off sensor for AC current(1-10amps).  I have seen hall effect switches
mentioned, but can't find a source.  This should be electrical isolated and
will interface to my PIC.

Thanks in advance.

Steve
-------------------------------------
E-mail: spam_OUTsdavidsonTakeThisOuTspamits.bldrdoc.gov
Steven Davidson
Dept. of Comm.  NTIA-ITS.N2
325 Broadway
Boulder, CO  80303
W 303-497-3411  FAX 5995
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1997\03\27@182200 by Harrison Cooper

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Microswitch makes em

{Quote hidden}

1997\03\27@194723 by John Dammeyer

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At 01:37 PM 27/03/1997 PST, you wrote:
>I went through my old PIC messages and can't find a reference to one, but I
>know I have seen one.  I need to sense if a motor is still running (current
>through my relays on my PC board.)  Someone must make a PC board mountable
>on/off sensor for AC current(1-10amps).  I have seen hall effect switches
>mentioned, but can't find a source.  This should be electrical isolated and
>will interface to my PIC.
>

Hall effect might be kind of pricy.  A toroid core with a one layer wrap of
about 30g wire loaded with a diode and a resistor || cap should give you a
high enough voltage to determine if you have current through the primary, (1
turn), going to the motor.

John
Pioneers are the ones, face down in the mud,
with arrows in their backs.
Automation Artisans Inc.      Ph. 1-250-544-4950
PO Box 20002                  Fax 1-250-544-4954
Sidney, BC CANADA V8L 5C9

1997\03\27@201752 by Tony Matthews

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sdavidson@ITS.BLDRDOC.GOV wrote:
>
> I went through my old PIC messages and can't find a reference to one, but I
> know I have seen one.  I need to sense if a motor is still running (current
> through my relays on my PC board.)  Someone must make a PC board mountable
> on/off sensor for AC current(1-10amps).  I have seen hall effect switches
> mentioned, but can't find a source.  This should be electrical isolated and
> will interface to my PIC.
>
> Thanks in advance.
>
> Steve
> -------------------------------------
> E-mail: sdavidsonspamspam_OUTits.bldrdoc.gov
> Steven Davidson
> Dept. of Comm.  NTIA-ITS.N2
> 325 Broadway
> Boulder, CO  80303
> W 303-497-3411  FAX 5995
> -------------------------------------
I have'nt tried this but if you put a small coil of wire with a lot of
wraps around the power lead you have a transformer with a 1 turn primary
the pic 16c84 has cmos inputs with protection diodes so you would have a
60 hertz square wave to the pin or not .isolated cheap small.Maybe it'll
work to. Now go back and let the experts tell you how to do it right :}.

1997\03\28@104743 by )

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Took a quick look through the Newark Electronics catalog. Found PC mount
sensors from F.W. Bell and Honeywell (pgs. 552-553 of cat. #114). The PC
mount ones are linear output, so you might need a comparator or
something to give you a go/no-go signal. Bell's are the PI series,
Honeywell's are the CSLA1/2 series. There are other non-PC mount type
sensors with a presettable threshold which gives you logic out for above
or below the threshold by Bell, Honeywell and others. These are on the
large size; PC mouse and larger. Some relay manufacturers such as
Guardian make similar (usually relay output) devices.

Hope this is of some help.


Frank Richterkessing
Experimental Methods Engineer
GE Appliances

@spam@FRANK.RICHTERKESSINGKILLspamspamAPPL.GE.COM


{Quote hidden}

1997\03\28@111924 by motodog

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Try Microswitch?

1997\03\28@181339 by Michael S. Hagberg

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circuit cellar did an article not long ago thant used ferret beads
and wrapped wire around them to send the signal to an a/d then into
a cpu.  he monitored all the circuits in his house.


michael

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