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Car Keys Micro Camera Review
hope it can help your life safe and happiness
|The #20 is one version of the 808 car keys micro camera.
It takes 720p video in H.264, AVI or MOV. It is similar to the #16 and #18.
It has an OV9712 1280x800 image sensor, a Novatek processor and
composite video output. It can record audio without video.
It has multiple colored LEDs to indicate the mode. eBay sellers
include beetleonline and others.
RCGroups has an 808 #20 aerial photography thread at New 808 #20 HD Key Fob Camera.
There are some #20 files in the C20 folder of the vault.
|140209 - The 808 #20 UART and diagnostic protocol|
in Germany has made a discovery about the 808 C20 camera.
There is a UART serial port (Gnd, RX, TX, 115200 baud) on the 808 #20 motherboard that supports a diagnostic protocol (shell).
There is no documentation provided about the protocol, but emu has been able to dump the #20 memory and find command strings, and experiment.
The protocol can be used to make the camera take a picture. This opens the
possibility of an external device like an Arduino to operate the
camera. As far as I know, the #20 is being replaced with
the HQ30, so I don't know how much longer the #20 will be
available. The dump file is in the
vault in the
The 808 #16 also uses a Novatek processor and information about the UART is here.
i managed to dump the memory with
r 0x0 1fffff
this stands for read from 0x0 with length 1fffff
i send you the file with this mail. but i am not really sure where the data ends, there may be some wrong bytes at the end of the file. if you are searching in this file for "memory" you can see the help string which comes up on the shell if you write h for help (as you can see in one of the fotos from my first mail)
i am searching for other funny things like additional commands ("li" on the shell stands for lens init..)
found some more interesting things.
you can switch the leds on and off with some commands
lgh -> GPIOMAP_LED_GREEN (blue led on)
lgl -> GPIOMAP_LED_GREEN (blue led off)
lrh -> GPIOMAP_LED_RED ?
lrl -> GPIOMAP_LED_RED ?
lfh -> GPIOMAP_LED_FCS ?
lfl -> GPIOMAP_LED_FCS ?
lr -> Lens retract ?
li -> Lens Init ?
laf -> ERR: Get Variation FP is null!! ?
lcd bl -> ERR: GPIOMap_TurnOffLCDBacklight() ?
mode photo -> Photo Mode
s2 -> Single Capture (shoots a photo! so you can control the cam by uart! this is very comfortable on a rc plane or something like that ;)
mode eng -> Engineering Mode
time -> 2012/10/15 2:48:47
puh, there are so many commands... :)
|130919 - Notes|
|It seems that the 808 #20
is still available on eBay. The producers next model is
HQ30, sold by
Dan B. sent me the following comments about his 808 #20 and the 8-pin connector that it uses.
I had seen the pinoutsguide.com page and there's sure an extensive list of devices that use this particular connector. I did find a post in the forum where a guy listed what he had that worked for his #20 camera, so I compared his list to what I had physically and it matched up, even though all I have from the supplier (BestDVR) is a 2-wire cable. GND and video, then he also had GND connected on the other side of the connector to pin 8.
At first I did not see these connectors on eBay then did a little more looking and believe I did find the right thing. Some have a group of 5, others have 10, 30, and someone else has 100 pieces. They sure look to be the correct connector based on all the photos and even the dimensions seem to match up. It's only costing me $8 or so for 30 of them so lets hope it's the correct one. Otherwise I might be turning them loose myself though I am not much of a seller on ebay (or buyer for that matter).
My initial tests last evening with the two individual wires from the camera connected to video in and GND (on the 200mw vtx) worked as I had hoped for FPV. The only thing so far that is kind of detrimental is the current time/date stamp in large white characters in the lower left portion of the video frame. I don't know if the modified config file BestDVR.txt will have any effect on the time/date stamp. I believe that is only related to the actual recorded video file and not the display screen. A quick test will determine that. In the right corner is the memory card icon which is not horrible really, but for FPV use it would be nice to have a clear screen view. The cameras (#20 and HQ30) stay powered as long as they are doing something i.e. recording to memory in driving mode or standard mode. I recorded for 20 minutes then the file closed and started a new file and kept going. I've never had longer than a 8 or 10 minute flight on my R/C batteries so this works just fine in my case to use the camera battery.
One nice thing is while recording and watching on the receiver/monitor screen, you see the recorded seconds and minutes timer plus the battery level indicator. When not using it for FPV you can tell where you are aiming the camera which is a little tricky just pointing it at whatever.
Let's hope the connectors I get are the right ones that will mate to the camera, and that we'll be able to wire them as needed to do what we want. All that's left really is to add a wire for one of the audio channels and then figure out a 90 degree housing (either potted or resin cast etc.) to make it fit a little nicer.
|121211 - #20 Battery Module Improvements|
|The producer of the
808 #20 (BestDVR) is committed to continuously improving the
camera. They are making some design improvements that will
increase the reliability of the battery module protection
If the camera does not respond to button presses, even though the battery has been charged and the camera has been reset, then the battery might need to be reset. Do the following on a non-metallic surface. Open the plastic case (two screws) and disconnect and re-connect the two cables - 1) the battery connector and 2) the USB cable. This will reset the battery and the camera will start working again.
|121122 - #20 preliminary information|
|The #20 has two different
firmware versions: AVI H.264, MOV H.264. The user can load either one. Only the two buttons
operate the camera. The camera can't be operated through
the USB interface.
The #20 manual in in the vault C20 folder. It is titled
"Thank you for choosing the design of the Company, the production of a series of security products, and hope that our products can give your life to bring fun and leave eternal memory"
|121101 - 808 #20|
|eBay seller BESTDVR
produced the #15 and is now producing the #20, available at
More information will be posted, as available.
|2010 XXX XX - XXXXXXXX|
This work by Charles E Lohr is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
IIS 6.0 There is no politically correct content on this web site. I have never owned an SUV.