Passive Infrared Detector - motion detector - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum

Passive Infrared Detector - motion detector

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Offline colinbm

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Passive Infrared Detector - motion detector
« on: 06 / June / 2010, 10:22:05 »
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Hi all
I have a IR-TEC passive infrared detector & want to set it up for motion detection photos.
The model is Ir-Tec Primo IR-530. http://www.irtec.com/ir-530_530c.htm
There is a link to its instructions there too.
I will set it up with 9 volts battery power.
My problem is the alarm when activated is constantly powered while the detector is seeing something.

I need to make it only send a logic signal of about 1 second or less to fire the shutter.
The voltage here is also 9 volts & it needs to be brought down to closer to 6 volts.
I don't know how these are done ? Can someone help me please ?
Cheers
Col

Re: Passive Infrared Detector - motion detector
« Reply #1 on: 06 / June / 2010, 11:08:33 »
First of all, remove the jumper from the NC/NO selector to make the relay contacts normally open.
That is equivalent to an unpressed button on a USB switch.

You can switch a voltage to a mini USB 'B' connector via those contacts.

Connect  a resistor of a few kohms to the detector V+ and other end of the resistor to the cathode of a 4v7 zener diode.
The diode anode connects to detector '-'.

The zener cathode is wired to one of the alarm contacts.
The other alarm contact is wired to usb V+ on your mini 'B' connector.
USB V- connects to detector '-'.



David
« Last Edit: 06 / June / 2010, 11:11:15 by Microfunguy »

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Offline colinbm

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Re: Passive Infrared Detector - motion detector
« Reply #2 on: 06 / June / 2010, 11:24:01 »
Thanks Microfunguy
I have an idea of what you are saying.
Will this drop the voltage to the detector ? or only the alarm ?
It is late here 1:30 am.
I will digest it better when I awake  :-)
Will try then, thanks
Cheers
Col

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Offline colinbm

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  • Canons S2IS Infrared, S5IS, A570 pair, SIGMA DP2
Re: Passive Infrared Detector - motion detector
« Reply #3 on: 06 / June / 2010, 11:41:26 »
Hi Microfunguy
Is this what I need to make ? The zener diode example is near the bottom of the page.
http://www.kpsec.freeuk.com/components/diode.htm
Cheers
Col


Re: Passive Infrared Detector - motion detector
« Reply #4 on: 06 / June / 2010, 14:19:50 »
Will this drop the voltage to the detector ? or only the alarm ?

It provides a 4.7V supply to the detector relay contacts (and therefore to the camera USB V+ connection).


Quote
Is this what I need to make ? The zener diode example is near the bottom of the page.
http://www.kpsec.freeuk.com/components/diode.htm

That is exactly it.



David
« Last Edit: 06 / June / 2010, 17:30:58 by Microfunguy »

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Offline colinbm

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  • Canons S2IS Infrared, S5IS, A570 pair, SIGMA DP2
Re: Passive Infrared Detector - motion detector
« Reply #5 on: 06 / June / 2010, 20:43:35 »
Thanks Microfunguy
I will go shopping for the parts now.
Cheers
Col

Re: Passive Infrared Detector - motion detector
« Reply #6 on: 07 / June / 2010, 05:55:47 »
Report back on your progress, it will be interesting to see how it works.

It is possible to create a shorter shutter-pulse than the alarm contacts provide .. but that is another story.


Are you in Thailand or Eastern India ?
« Last Edit: 07 / June / 2010, 06:01:11 by Microfunguy »

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Offline colinbm

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  • Canons S2IS Infrared, S5IS, A570 pair, SIGMA DP2
Re: Passive Infrared Detector - motion detector
« Reply #7 on: 07 / June / 2010, 08:36:12 »
Hi Microfunguy
Yes I have the parts to add to the PIR.
I am trying to get it finished before I go to bed :-)
Yes I will post how I go, thanks for your interest.
I am in Queensland Australia.
Cheers
Col


Re: Passive Infrared Detector - motion detector
« Reply #8 on: 07 / June / 2010, 08:57:27 »
I am in Queensland Australia.

I thought a six hour time-zone difference was unusual, I mistook your posting time for current time.

The difference with UK is nine hours (Spring to Autumn).


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Offline colinbm

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  • 230
  • Canons S2IS Infrared, S5IS, A570 pair, SIGMA DP2
Re: Passive Infrared Detector - motion detector
« Reply #9 on: 07 / June / 2010, 19:19:32 »
Hi Microfunguy
I have made up the circuit & there is only 3 volts at the USB plug ?
Cheers
Col

 

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