Post by thread:Looking for a AC Current sensor

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_OUTsdavidsonTakeThisOuTits.bldrdoc.gov Steven Davidson Dept. of Comm. NTIA-ITS.N2 325 Broadway Boulder, CO 80303 W 303-497-3411 FAX 5995 -------------------------------------

Microswitch makes em {Quote hidden}>---------- >From: .....sdavidsonKILLspam@spam@ITS.BLDRDOC.GOV[SMTP:sdavidsonKILLspamITS.BLDRDOC.GOV] >Sent: Thursday, March 27, 1997 2:37 PM >To: .....PICLISTKILLspam.....MITVMA.MIT.EDU >Subject: Looking for a AC Current sensor > >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: EraseMEsdavidsonspam_OUTTakeThisOuTits.bldrdoc.gov >Steven Davidson >Dept. of Comm. NTIA-ITS.N2 >325 Broadway >Boulder, CO 80303 >W 303-497-3411 FAX 5995 >------------------------------------- >

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

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: sdavidsonspam_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 :}.

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.RICHTERKESSINGKILLspamAPPL.GE.COM {Quote hidden}>---------- >From: KILLspamsdavidsonKILLspamITS.BLDRDOC.GOV[SMTP:RemoveMEsdavidsonTakeThisOuTITS.BLDRDOC.GOV] >Sent: Thursday, March 27, 1997 4:37PM >To: spamBeGonePICLISTspamBeGoneMITVMA.MIT.EDU >Subject: Looking for a AC Current sensor > >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: TakeThisOuTsdavidsonEraseMEspam_OUTits.bldrdoc.gov >Steven Davidson >Dept. of Comm. NTIA-ITS.N2 >325 Broadway >Boulder, CO 80303 >W 303-497-3411 FAX 5995 >------------------------------------- >