CHUANGMI 720p

[Unclezz]

Hi there,
any chance to have this working on CHUANGMI 720P? This is using same chipset as mijia 720 I think: GM8135.

Thanks

[Unclezz]

Is anybody willing to help to get also ChuangMi on customer firmware?
@Filipowicz251 any chance you have time to help? :) This is also running on GM1835S.

[Unclezz]

Apparently this camera does not have a serial to use in order to access u-boot.
I suggest not to buy it.

[willthrom]

What about thos Q-Tx and Q-Rx?

[Unclezz]

Unfortunately there is no output from there.
I tried connecting to both Q-RX/Q-TX and 2-RX/2-TX that is on the left lower corner. Simply no output.
On USB/UART connector LEDs are not even blinking.
I took some photos of what I connected:

Note: I tried on 2 different boards :)

[willthrom]

That is odd..

[Unclezz]

@willthrom well, what can I say? I agree. The only doubt I had was about the USB Adapter. I tried one with cp210x and another one with CH341. On both the result is the same... should I use something different?

P.S.: I am total newbie on this stuff!

[willthrom]

I guess you tried the other way. Rx -> TX , Tx -> Rx.
I used a very old UART USB Adarpter and I didn't have any problem.

Keep in mind you might need to restart the camera to get any TX input....

[Unclezz]

Yes, yes.
Connections were RX to TX and TX to RX, but I even tried swapping the cables without any good result.
Of course I did restart the camera to check for data to flow.

[willthrom]

Can you check with a voltage meter the GND with the TX? I see 3 GND....

[Unclezz]

GND + TX --> 3.3V
GND + RX --> ~3V

On both outputs (0-RX. 0TX and 2-RX, 2-TX)

[Unclezz]

Correction... on the 0-RX and 0-TX I have both 3.3V
On 2-RX --> ~3V and on 2-TX --> 3.3V

[Unclezz]

BTW, GND (I think is normal) are all the same. There is continuity between them.

[jymbob]

Others have had some success with this camera. It started with an issue raised on FangHacks, then someone managed to get telnet working from a custom image (now hosted here with loose instructions.

There's a new claim that the RTSP server from here works, but I haven't tested it yet.

[jymbob]

I can confirm that the Mijia 720P firmware works. I've put together a repo with instructions:
https://github.com/jymbob/chuangmi-720-hack

Note I'm not the author of any of the code, just collating it into a working package