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2016-07-22 20:06 <roh> hm. anybody played with miniature (<3mm diameter) cmos cameras before?
2016-07-22 20:07 <roh> i got some for free and am wondering how to get them to talk to me.. it got i2c, some vout line and a '4mhz' labeled one. still not sure if i need to provide a clock in there or what
2016-07-22 20:42 <whitequark> probably has ntsc output
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2016-07-22 21:07 <roh> whitequark: maybe... any idea why 4mhz?
2016-07-22 21:08 <roh> ntsc should eat 4.433 something i thought
2016-07-22 21:09 <roh> or 3.5something
2016-07-22 21:09 <roh> well.. i found a 3.6864 oscillator in the misc parts box and hooked it up.. voila.. there is the i2c working somehow. a device on 0x36 which wasnt there before
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2016-07-22 21:57 <DocScrutinizer05> hook your scope to vout
2016-07-22 21:58 <DocScrutinizer05> but I'm afraid you will need to initialize the thing via I2C
2016-07-22 21:58 <DocScrutinizer05> not exactly simple to guess or RE how to do that
2016-07-22 22:01 <DocScrutinizer05> wpwrak: http://bucket1.glanacion.com/anexos/fotos/30/medio-ambiente-2239330w640.gif  is deviation from long term average
2016-07-22 22:01 <DocScrutinizer05> no 'icy spot'
2016-07-22 22:20 <roh> hm. scoped it. i2c dumped it... and i guess my clock is too far off... anyhow.. the available brief-sheet says its not anything normal like regular video... 400x400 pixels says that quite directly.
2016-07-22 22:31 <roh> i fear i need to build some digizer extra for this
2016-07-22 22:45 <DocScrutinizer05> err, teh horizontal "pixels" (correctly lines) are irrelevant in a CVBS signal. And 400 lines vertical would be "normal" for NTSC, I.E should still show a picture when the frame rate is 45 to 65Hz
2016-07-22 22:49 <DocScrutinizer05> worst case use an old CRT TV, those are usually even more tolerant against out-of-specs  framerates, vertical resolution lines etc. Just the line frequency should be 15kHz to 16KHz
2016-07-22 22:50 <DocScrutinizer05> attaching a scope to vout you's easily see the line frequency, either it's TV ~16kHz, or VGA ~32kHz
2016-07-22 22:52 <DocScrutinizer05> problem would be progressive n H * 400 V for TV, you have interleave there and so a usual TV could only show cope with max ~700/2 lines per frame
2016-07-22 22:53 <DocScrutinizer05> progressive
2016-07-22 22:53 <DocScrutinizer05> VGA works also with 60Hz frame rate but 400 progressive, so the line frequency is twice as high
2016-07-22 22:55 <DocScrutinizer05> aka 640H*400Vprog@60
2016-07-22 22:57 <DocScrutinizer05> while PAL TV is nH*~512Vinterleave@50
2016-07-22 22:57 <DocScrutinizer05> oops sorry NTSC has 486V
2016-07-22 22:58 <DocScrutinizer05> and VGA 640*480
2016-07-22 23:03 <DocScrutinizer05> bottom line: as long as you see a semi-decent CVBS signal on vout, you'll most likely find a monitor (or TV) to sync and display that signal
2016-07-22 23:04 <DocScrutinizer05> nasty when vout has a serial digital signal though
2016-07-22 23:08 <DocScrutinizer05> dunno if https://en.wikipedia.org/wiki/Camera_Serial_Interface#CSI-1 would come with one non-differential line, for example
2016-07-22 23:16 <DocScrutinizer05> lane, not line
2016-07-22 23:18 <DocScrutinizer05> nope, even CSI-1 comes with differential lanes (and clock) only, at least CSI-1 actually has only one lane
2016-07-22 23:19 <DocScrutinizer05> http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=sn65lvds315&fileType=pdf
2016-07-22 23:21 <DocScrutinizer05> more convenient URL: http://www.ti.com/product/SN65LVDS315
2016-07-22 23:32 <roh> its not digital as far as i can guess. its a coax line and the sheet says analog out
2016-07-22 23:32 <roh> http://www.buyemp.com/product/ambu-ascope-3-5-0-2-2
2016-07-22 23:32 <roh> this is what i got ;)
2016-07-22 23:33 <roh> and i do NOT have this one to just 'sniff it' ;) http://www.buyemp.com/product/ambu-aview-monitor
2016-07-22 23:35 <roh> because the monitor gets reused, the camera-endoskop gets thrown away as medical trash usually
2016-07-22 23:38 <roh> my plan is to recycle those for weird uses... maybe my friends with their beehives want some more sensors?
2016-07-22 23:40 <DocScrutinizer05> nice
2016-07-22 23:41 <DocScrutinizer05> yeah, coax and analog out are very good signs
2016-07-22 23:41 <DocScrutinizer05> I'd suggest to connect it to a cinch and plug it into a CVBS-in
2016-07-22 23:42 <DocScrutinizer05> ;-)
2016-07-22 23:44 <DocScrutinizer05> could you mod one to wiretap the I2C and connect to a monitor device while sniffing?
2016-07-22 23:45 <DocScrutinizer05> since you will most likely need to confirure one or two dozen registers to make the critter behave
2016-07-22 23:47 <roh> i dont have access to a monitor. it sits in a sterile room which i dont have access to ;)
2016-07-22 23:48 <roh> well.. next i'll get some better oscilator.. like 4mhz instead of 3.56someting
2016-07-22 23:48 <DocScrutinizer05> wore, not only you but also any laptops or whatever you would bring doesn't have access too
2016-07-22 23:48 <DocScrutinizer05> worse*
2016-07-22 23:48 <roh> atleast ive spoken a few bytes i2c or SCCB like omnivision calls it with something today
2016-07-22 23:49 <roh> SCCB seems to be i2c with no ack bits... which is kinda stupid but well...
2016-07-22 23:49 <DocScrutinizer05> meh
2016-07-22 23:50 <DocScrutinizer05> did a i2cdump?
2016-07-22 23:50 <roh> http://pastebin.com/UnZNpRzy
2016-07-22 23:51 <DocScrutinizer05> hmm 19 to 20 registers
2016-07-22 23:51 <roh> some omnivision devices have an 16bit id register at address 0x300a
2016-07-22 23:51 <DocScrutinizer05> to 25
2016-07-22 23:52 <roh> so i just guessed that 69 30 is this.. at 0xa
2016-07-22 23:53 <DocScrutinizer05> :nod:
2016-07-22 23:53 <DocScrutinizer05> no manuf logo?
2016-07-22 23:54 <roh> and voila.. some google brought up http://www.ovt.com/products/sensor.php?id=49 , which is the first sensor ive looked at today which had some kind of analog out at all and is small enough to fit what i see as case (its 5.5mm total diameter and has a 2.2mm tool-shaft)
2016-07-22 23:54 <roh> http://www.ambu.de/deu/produkte/area_of_interests/anaesthesia/product/ambu%C2%AE_ascope%E2%84%A2_3_5-0-2-2-prod17261.aspx
2016-07-22 23:54 <DocScrutinizer05> :-D
2016-07-22 23:54 <roh> this one
2016-07-22 23:55 <DocScrutinizer05> nah on the sensor, but you already found it
2016-07-22 23:57 <DocScrutinizer05> here you are 400*200@60, "full @30"
2016-07-22 23:57 <roh> well.. thats my best guess so far. i am not sure at all... the numbers is just plain guessing from the i2cdump
2016-07-22 23:58 <roh> if that pcb in the handpiece would not have been labeled with silkscreen at the solderpads for the cable from the camera and to the monitor...   i would still not have power on it.
2016-07-22 23:59 <roh> the 2 leds in the head get their own vcc and seem to like 20mA at 6.0-6.1V just fine... and my 'doctor friend' who uses these on a daily basis gave me his best guess when testing out different currents about how bright its on the original device