Alarm PIR Resistor

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nzpilot1181

132 posts

Master Geek

#281183 4-Feb-2021 11:31

Morning All,

I am wondering if someone could assist with advising what type of resistor this is?
Essentially I am wiring in another PIR exactly the same model PIR as in the photo. My knowledge of resistors is limited so was hoping someone could tell me what I need to get from Jaycar.

Thanks
Jason

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132 posts

Master Geek

#2646964 4-Feb-2021 11:32

elpenguino

3421 posts

Uber Geek

#2646968 4-Feb-2021 11:39

It's a 'standard' resistor, either carbon or metal film.

As far as value goes, it comes out at 3.3 kilo ohm.

https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code

I can't see the PCB labels to tell if it's wired to a 12 volts on one side, and an input on the other side.

If it is, it's being used as a 'pull up' resistor.

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

nzpilot1181

132 posts

Master Geek

#2646982 4-Feb-2021 11:56

Thanks for your reply. One end is wired into 12v Negative and the other Relay slot.

cyril7

9058 posts

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#2646984 4-Feb-2021 11:59

Hi, I would have said its 110ohms not 3k3 but the colours are not clear, but if you are trying to add a PIR then that relay output is not required, what exactly are you trying to do

Cyril

elpenguino

3421 posts

Uber Geek

#2646985 4-Feb-2021 12:01

So it provides a path to earth for the relay. The other relay connection probably goes to + 12 V, at a guess.

When using a resistor as a pull up, the exact value is usually not so important, as long as it is above a certain amount.

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

pih

649 posts

Ultimate Geek

Lifetime subscriber

#2646990 4-Feb-2021 12:20

Yeah, looks like either a 2.2kOhm or 3.3kOhm to me, depending on whether they're red or orange stripes (hard to tell). But as noted it probably doesn't matter too much what the value is if it's in the kilo ohm range.

elpenguino

3421 posts

Uber Geek

#2647013 4-Feb-2021 12:39

cyril7:

Hi, I would have said its 110ohms not 3k3 but the colours are not clear.

Cyril

Knowing which end to start at can be a challenge sometimes. The end two have to be red in your scenario as orange is not a valid tolerance.

Let's get colour confirmation before the thread veers off tangent for multiple pages :-)

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

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nzpilot1181

132 posts

Master Geek

#2647027 4-Feb-2021 13:05

Hey guys thanks heaps appreciate your replies.

Here is a slightly better pic.. am out at the moment but will try and get a closer shot when home.

cyril7

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#2647036 4-Feb-2021 13:20

Ahh, got ya its on the PIR I thought it was in the main panel, so what EOL resistance is the panel expecting, different brands expect different values depending on if the PIRs are multiple per interface. Assuming its orange orange black black black then 3k3 would be right.

Cyril

Fred99

13684 posts

Uber Geek

#2647115 4-Feb-2021 14:28

cyril7:

Ahh, got ya its on the PIR I thought it was in the main panel, so what EOL resistance is the panel expecting, different brands expect different values depending on if the PIRs are multiple per interface. Assuming its orange orange black black black then 3k3 would be right.

Cyril

To be pedantic the last two look like brown & brown to *me, so I'm assuming a typo above, as 3k3 (1%) should be right.

(*disclaimer - I'm a bit colour blind)

cyril7

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#2647118 4-Feb-2021 14:37

TBH I too am unsure mix of ageing eyesight and poor photographic evidence

Cyril

Fred99

13684 posts

Uber Geek

#2647134 4-Feb-2021 15:18

cyril7:

TBH I too am unsure mix of ageing eyesight and poor photographic evidence

Cyril

A multimeter (even an el-cheapo one from jaycar etc) could give the answer, but on my display the bands definitely do look like orange orange black brown brown to me, 3, 3, 0, one more zero, one percent. so 3.3k as you stated. I don't think a 5 banded resistor with orange at one end and black at the other should exist, as neither black nor orange are valid colours for the tolerance band.

Daynger

435 posts

Ultimate Geek

#2647992 4-Feb-2021 23:12

3k3.

Yes the value does matter, close enough isnt good enough.

Im picking you are connecting to a Bosch alarm panel, you can zone double with a 6k8 if you are out of zone inputs and it is programmed appropriately.

nzpilot1181

132 posts

Master Geek

#2648023 5-Feb-2021 09:07

@daynger - yes its a Bosch 2000 panel. Have checked the panel and there are plenty of zone slots still available so the thought was just to wire the additional PIR into one of those.

Daynger

435 posts

Ultimate Geek

#2648638 6-Feb-2021 12:08

nzpilot1181:

@daynger - yes its a Bosch 2000 panel. Have checked the panel and there are plenty of zone slots still available so the thought was just to wire the additional PIR into one of those.

Then a 3k3 is what you want, sometimes techs leave the spares that come with the panel in the enclosure.

If you are in south central auckland i have about six to seven million of them in my car, you can have one for free.

You will need installer code access to program in the new zone, or blow the panel away and reprogram from scratch.

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