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#1
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software to detect an LED
Does anyone know of some software that will detect an LED coming on or going
off using a webcam, basically looking for substantial change in light level in a small area? I've tried a few bits of shareware motion detection stuff but they don't spot my HDD LED flicker. |
#2
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software to detect an LED
On 11-Sep-2007, "Dave" wrote: Does anyone know of some software that will detect an LED coming on or going off using a webcam, basically looking for substantial change in light level in a small area? I've tried a few bits of shareware motion detection stuff but they don't spot my HDD LED flicker. Try an addon telephoto lens to make the LED a significant part of the webcams field of view. You may have a problem that LED's have a very sharply defined spectral range, quoted in specs as so many nm (nanometres), maybe the webcam isn't very responsive at that wavelength. A photodiode should be able to see an LED off/on as this is the principle of opto-couplers, I presume you have thought of this? Motion detection isn't the same as light detection, your HD LED isn't moving, just going on and off. Too much background ambient light may be reducing the sensitivity of detection. |
#3
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software to detect an LED
Dave wrote:
Does anyone know of some software that will detect an LED coming on or going off using a webcam, basically looking for substantial change in light level in a small area? I've tried a few bits of shareware motion detection stuff but they don't spot my HDD LED flicker. Motion detection will detect a light change and interpret it as 'motion' providing the change is significant EG: Turning on a light in a darkened room or a change in light and shadow from a wind blown tree. But I don't think a red(?) LED flicker would be a 'significant' enough change to trigger a camera, particularly in a small area. I agree with what ato-zee said: a photo diode is probably your best bet or make the LED a significant part of the cameras view. |
#4
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software to detect an LED
well, I eventually found webcam surveyor which seems to do the trick, just
need to get the lighting conditions right. I'm actually trying to detect a change in any of 40 LEDs in an array(4x10), I was just using my HD LED to test it out first. Whole new huge problem, my xbox 360 cam which works fine on my desktop, refuses to work on the laptop which I need to use it on. device manager sees it connected to one of the usb2 root hubs but nothing else sees it. a crappy old logitec thing works fine, but the picture is too useless. I've tried the usual uninstall/reinstall, disable/enable, checked it's not doing powersave on the usb port etc... any ideas? (sorry kim, I replied to you by accident instead of to group) "kim" wrote in message ... Dave wrote: Does anyone know of some software that will detect an LED coming on or going off using a webcam, basically looking for substantial change in light level in a small area? I've tried a few bits of shareware motion detection stuff but they don't spot my HDD LED flicker. Motion detection will detect a light change and interpret it as 'motion' providing the change is significant EG: Turning on a light in a darkened room or a change in light and shadow from a wind blown tree. But I don't think a red(?) LED flicker would be a 'significant' enough change to trigger a camera, particularly in a small area. I agree with what ato-zee said: a photo diode is probably your best bet or make the LED a significant part of the cameras view. |
#5
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software to detect an LED
On 12-Sep-2007, "Dave" wrote: Whole new huge problem, my xbox 360 cam which works fine on my desktop, refuses to work on the laptop which I need to use it on. device manager sees it connected to one of the usb2 root hubs but nothing else sees it. a crappy old logitec thing works fine, but the picture is too useless. I've tried the usual uninstall/reinstall, disable/enable, checked it's not doing powersave on the usb port etc... any ideas? In the early revisions of Skype video my Lyromedia USB webcam just gave a black screen. Sky[e acknowledged it was a known problem reported by several users. I downloaded Splitcam from http://www.splitcamera.com/ it recognised the camera and Skype video worked, something to do with the video format/NTSC compatibilty issue, as far as I could see. Once it worked I didn't dig any further into the how or why. |
#6
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software to detect an LED
wrote in message ... On 12-Sep-2007, "Dave" wrote: Whole new huge problem, my xbox 360 cam which works fine on my desktop, refuses to work on the laptop which I need to use it on. device manager sees it connected to one of the usb2 root hubs but nothing else sees it. a crappy old logitec thing works fine, but the picture is too useless. I've tried the usual uninstall/reinstall, disable/enable, checked it's not doing powersave on the usb port etc... any ideas? In the early revisions of Skype video my Lyromedia USB webcam just gave a black screen. Sky[e acknowledged it was a known problem reported by several users. I downloaded Splitcam from http://www.splitcamera.com/ it recognised the camera and Skype video worked, something to do with the video format/NTSC compatibilty issue, as far as I could see. Once it worked I didn't dig any further into the how or why. no applications see the cam is actually connected. USB sees it but doesn't seem to be adding it as an imaging device for the system to be able to use. it's bugging me, need booze! |
#7
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software to detect an LED
On 12-Sep-2007, "Dave" wrote: no applications see the cam is actually connected. USB sees it but doesn't seem to be adding it as an imaging device for the system to be able to use. it's bugging me, need booze! Could be that you need to install/reinstall the drivers for the webcam. Also look in System, Hardware Manager, to see if there is the dredded yellow exclamation mark against any of the USB devices. Looks like the laptop is seeing the camera as a USB device, but doesn't know how to drive it, or maybe has installed a disfunctional MS$ generic driver for it. |
#8
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software to detect an LED
Dave wrote:
(sorry kim, I replied to you by accident instead of to group) No problems. |
#9
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software to detect an LED
wrote in message ... On 12-Sep-2007, "Dave" wrote: no applications see the cam is actually connected. USB sees it but doesn't seem to be adding it as an imaging device for the system to be able to use. it's bugging me, need booze! Could be that you need to install/reinstall the drivers for the webcam. Also look in System, Hardware Manager, to see if there is the dredded yellow exclamation mark against any of the USB devices. Looks like the laptop is seeing the camera as a USB device, but doesn't know how to drive it, or maybe has installed a disfunctional MS$ generic driver for it. No exclamation marks. The device says no drivers loaded so I don't know which files to manually delete (uninstall doesn't help me). I think a weekend of Beer is required to help solve it. |
#10
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software to detect an LED
On 14-Sep-2007, "Dave" wrote: No exclamation marks. The device says no drivers loaded so I don't know which files to manually delete (uninstall doesn't help me). I think a weekend of Beer is required to help solve it. If it says no drivers loaded it means you have to install the drivers that came on the CD with the webcam. Or go to the webcam mfrs. website, download the drivers for your operating ststem, and install them. |
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