[blade breaker]

Hey guys,

I try to programm my CC3D Atom Board since hours, but it is impossible to arm my board when it is not connected to a PC. When I connect it to the PC everything is fine and works proberly. First I programmed arming to a switch and it worked great with the Libre Pilot Software and the motors spool up. But when it is not connected to the PC, it woun't work. So I tried to set the board to "alwayes armed". And same thing again - works fine when the board is connected to the PC, but it does nothing when it is disconnected.

Does anyone has an idea what that could be?

My setup:
DYS 30A ESC with latest BL-Heli software
DYS Motors
7,4V UBEC
CC3D Atom Board

[f5soh]

Hi,

Maybe a powering issue, is the board blinking / booting while powered only using the battery ?

What do you mean with 7.4V ubec ? You only need +5V for board.

[blade breaker]

No the LED is solid green. And it is 7,4V beacause it is a step-down-converter because I use 6S for this quad.

[f5soh]

And the other Led ?
What's his behavior while connecting the battery ?

If you apply 7.4V to the board, the same voltage is applied to all devices connected to the board: Receiver, osd... not so good.

[blade breaker]

Nothing. The green LED starts to burn and that was it. Yes I know that everything else will get 7,4V also, but they should handle it without problems.

[blade breaker]

Just looked up what my setup could handle:

CC3D Atom: Up to 15V
X4RSB: Up to 10V

So 7,4V should fit fine. Everything else has got another stepdown converter (fpv equipment)

[f5soh]

The green led show the power input, if the other led do not blink you can expect the board do not boot.

The 15V limitation only applies to original CC3D/Atom (mean sell in OP website / RMRC) that use the recommended regulator.
Almost all Chinese boards do not use regulators that can handle more than 10V , maybe some of them uses cheaper regulators.

[blade breaker]

Tried it with 5V - exactly the same case. Green LED is solid, blue one isn't

[f5soh]

Measure the voltage on Green led or SBL pad, you should have 3.3v.

If no blue led activity, the board do not boot / run.

[blade breaker]

Okay, now I messured volts and I got 3,3V on SBL Pad and 2V on green LED. I also tried to load a new bootloader + firmware, but didn't work.

[blade breaker]

No one an idea?

[f5soh]

If the board boot/blink while connected to USB port and do not blink/boot using external power you can assume a hardware issue.

Schematic is here:
https://github.com/librepilot/LibrePilot/raw/next/hardware/Production/CopterControl%203D/CopterControl%203D%20Schematic.pdf