Passive Infrared Detector - motion detector

[Microfunguy]

Have you connected the led (without another resistor) directly across the zener ?

If so, that would pull the voltage down.

[colinbm]

Hi Microfunguy
No I don't measure with the LED in the USB.
I just have the LED on a small board with a male mini USB plug just to show me if it is working & correct polarity.
I have another small board with a male mini USB plug so I can attach the multimeter to that.

I have been thinking, there should not be voltage at the junction of the resistor & zener diode as it is oneway, the other way ? I have rewired again after some cleanups & I don't get voltage there now, just at the battery terminals 1 & 2 & the end of the USB.
Cheers
Col

[Microfunguy]

Not sure what you are doing.
This is a very simple circuit.

If the end of the zener marked with a band (the cathode) is connected to the resistor there WILL be 4.7V.

Please confirm this without anything else connected.

[colinbm]

Sorry Microfunguy, I am not trying to wear you out.
OK I have got 3.25 volts at the cathode of the zener, with the 3 kilo ohm resistor.
When I connect the USB I get 3.15 volts at the end.
Cheers
Col

[Microfunguy]

I guess there is not enough current (about one mA) through  the zener to reach the breakdown voltage.

What is the exact device number ?

Do you have any resistors of a few hundred ohms ?

[colinbm]

Thanks Microfunguy
The numbers on the zener are 4732 & the catalouge has 4V7.
I have just put in a 1 kilo ohm resistor & got 5.6 volts at the cathode & the USB end.
Have we got it now :-)
Cheers
Col

[Microfunguy]

Well, it will work but the voltage is meant to stabilise at 4.7V.

Anyway, just try it, the camera draws negligible current.

[colinbm]

Thanks for your help Microfunguy
I really appreciate what you have done for me here & hopefully I & others have learnt something & it is useful.
I will get some shots tomorrow & see how it goes, 9pm here :-)
Cheers
Col

[colinbm]

OK I have tried to take some pics with no luck ??
I have set the menu to 'enable remote'.
I have a USB cable push button remote that works, but not the PIR cable remote ??
I am getting 5.6 volts at the USB plug & the correct polarity.
Any clues to what I need to do Please ?
Cheers
Col

[Microfunguy]

It will make it easier for me if we first get it working with SDM.

You can then revert to CHDK.

Rename your existing DISKBOOT.BIN and replace with version from here :

http://stereo.jpn.org/eng/sdm/download.htm

(you do not need Common_files.zip).

After booting, enter ALT mode.

Every time you press your switch, 'USB' should be displayed top left.


Is it ?

[colinbm]

Microfunguy
I am getting "Service Temporarily Unavailable" so maybe everyone else has seen this before me ?
Col

[Microfunguy]

For the CHDK forum or the SDM website ?

What is your camera and firmware version ?

[colinbm]

SMD website
S5is 101b

[Microfunguy]

Try again, I can access it :-

http://stereo.jpn.org/eng/sdm/file/1.83-148-s5is-101b-57.zip

[colinbm]

Yep got that onto my SD card.
DISKBOOT BIN FILE 177 KB.
Cheers
Col