[Diy_efi] The so called "Noid" lights ?
Mike
niche
Mon Sep 10 04:41:51 UTC 2007
Very true Bobby,
From V=IR and the volt drop of the LED, 4v for white, 2v for red/green/yellow etc
decide on your current 20mA for red/green/yellow 40mA for white etc...
I'm looking at this from the design perspective, if I can bring out a low cost
yet reasonably smart noid light that tells you if you have a shorted turn on
an injector as well as polarisation issues then maybe I can get enough takers
if I bundle it with some other things, like the fuserail I designed a few years ago,
cheers
mike
At 12:17 PM 9/10/07, you wrote:
>Mike,
>
>(I am not an electronics expert - you may want check this with someone who
>knows which end of the soldering iron to hold.)
>
>It is probable that the injector drive circuit can source the extra current
>to drive the LED while it is also driving the injector. So using a LED in
>parallel to the injector is probably OK.
>
>I believe that you want to put a current limiting resistor in series with
>the LED to avoid burning out the LED.
>
>Bobby
>
>On 9/9/07, Mike <niche at iinet.net.au> wrote:
>>
>> Thanks for the comments guys,
>>
>> It probably would help if I explained the reason I raised the subject.
>>
>> These days modern electronics can be quite sophisticated, small and low
>> cost,
>>
>> It should therefore be possible to design a "smart" noid light which does
>> the very least such as:-
>>
>> a. Be "inline" with the drive to the injector to observe simultaneous
>> operation.
>> b. Have it show polarity is the same on all injectors (assuming all 6 are
>> wired correctly)
>> in situations where people build up looms and/or wishing to avoid
>> polarisation if that is an issue.
>> c. Have it indicate whether the injector has a shorted turn.
>>
>> I dont need a Noid light for myself, though it might be a handy tool to
>> leave in the box.
>>
>> Its raised my interest how people swear by them on the forum I listed yet,
>> to me, they
>> seem very simple dumb devices and for the price I would have expected a
>> little more.
>>
>> These days with LEDs using so little current (in comparison with the
>> injector) it shouldnt
>> be necessary to worry about the injector resistance and just wire in a
>> light in parallel in
>> some type of inline connector arrangement.
>>
>> Of course the electronics can be cheap and low cost even for a little
>> sophistication
>> but it seems the packaging and presentation can still be a pain and I
>> guess this is a stumbling
>> block...
>>
>> Thanks for the link to etoolcart but so far, that is the only one I have
>> found even from the calaisturbo
>> site, there just dont seem to be any other people doing them on a
>> commercial basis anywhere,
>>
>> Thanks
>>
>> Mike
>>
>>
>>
>>
>>
>>
>> At 10:36 AM 9/10/07, you wrote:
>> >Mike,
>> >
>> >I made one - I measured the resistance of the injector - then a small
>> light
>> >- I added resistors to make the resistance similar. I wired it in in
>> place
>> >of the injector. It seemed to work - it would light up about when I
>> thought
>> >it it should.
>> >
>> >It seemed to work - but I never got the car running - so I'm not sure
>> this
>> >is a good idea.
>> >
>> >Bobby
>> >
>> >On 9/9/07, Mike <niche at iinet.net.au> wrote:
>> >>
>> >> Over here in Oz, a "Noid" light seems to be just a simple LED
>> >> which goes in parallel with the injector, its a tool to verify the ECU
>> >> is driving its injector output and that the signal is getting as far
>> >> as the injector, ie All the way through the loom.
>> >>
>> >> You basically, unplug the injector connector and plug in the Noid
>> >> light intot he injector and the injector connector into the noid so
>> >> the noid is "inline" to the injector, when the injector is driven the
>> >> light is supposed to come on.
>> >>
>> >> My question is,
>> >>
>> >> Is this just a basic light or are there any inline type testers like
>> this
>> >> that
>> >> are any more sophisticated ?
>> >>
>> >> I'm not complicating this at present with any Duty cycle issues, just
>> >> wishing
>> >> to find out if people are using anything more sophisticated than a
>> simple
>> >> LED for their inline injector testing ?
>> >>
>> >> Regards
>> >>
>> >> Mike
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> At 02:35 AM 9/10/07, you wrote:
>> >> >Im not exactly sure what you are looking for, but this little tester
>> is
>> >> very
>> >> >cool. Its a dual led test light. Magnetic pickups can light the leds
>> in
>> >> >this. Its a pretty helpful little test light.
>> >> >http://www.etoolcart.com/index.asp?PageAction=VIEWPROD&ProdID=248
>> >> >
>> >> >You could try searching "injector pulse width meter" Not too much
>> comes
>> >> up
>> >> >but i think this is more what your lookin for. Besides these, i cant
>> >> think
>> >> >of anything besides an oscilloscope.
>> >> >
>> >> >On 9/9/07, Mike <niche at iinet.net.au> wrote:
>> >> >>
>> >> >> Hi chaps,
>> >> >>
>> >> >> Nice to see some activity here re logging, a subject in itself, I
>> have
>> >> >> idea for small cheapie
>> >> >> logger and finally pinned down an enclosure/connector combo, but its
>> >> not
>> >> >> USB, just serial
>> >> >> but would work for the most part with the cheapie usb to serial
>> >> >> adaptors...
>> >> >>
>> >> >> Anyway, i digress...
>> >> >>
>> >> >> I'm on http://www.calaisturbo.com.au from time to time as "Niche" -
>> >> funny
>> >> >> that...!
>> >> >>
>> >> >> And some people use "Noid" lights to test they have drive to the
>> >> >> injectors, which is (as far
>> >> >> as I understand) just a LED light in a moulding which is pluggable
>> >> inline
>> >> >> with the loom
>> >> >> to the injector at the actual injector. So you can see it blink when
>> >> >> cranking etc...
>> >> >>
>> >> >> I'm interested to know if anyone has a "noid" like type tester or
>> item
>> >> >> which does any more
>> >> >> than just light up an LED when the driver wants to turn on the
>> injector
>> >> ?
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >> Regards from
>> >> >>
>> >> >>
>> >> >> Mike
>> >> >> Perth, Western Australia
>> >> >> VK/VL Commodore Fuse Rail panel that wont warp, twist or melt,
>> >> >> guaranteed !
>> >> >> Twin tyres for most sedans, trikes and motorcycle sidecars
>> >> >> http://niche.iinet.net.au
>> >> >> _______________________________________________
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>> >> >>
>> >> >_______________________________________________
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>> >>
>> >>
>> >>
>> >> Regards from
>> >>
>> >>
>> >> Mike
>> >> Perth, Western Australia
>> >> VK/VL Commodore Fuse Rail panel that wont warp, twist or melt,
>> >> guaranteed !
>> >> Twin tyres for most sedans, trikes and motorcycle sidecars
>> >> http://niche.iinet.net.au
>> >> _______________________________________________
>> >> Diy_efi mailing list
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>> >> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
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>> >>
>> >
>> >
>> >
>> >--
>> >Toward freedom,
>> >
>> >Bobby Yates Emory
>> >_______________________________________________
>> >Diy_efi mailing list
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>
>
>
>--
>Toward freedom,
>
>Bobby Yates Emory
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
>Main WWW page: http://www.diy-efi.org/diy_efi
Regards from
Mike
Perth, Western Australia
VK/VL Commodore Fuse Rail panel that wont warp, twist or melt, guaranteed !
Twin tyres for most sedans, trikes and motorcycle sidecars
http://niche.iinet.net.au
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