MultiWii

Hello
I have MWC MultiWii SE V3.0

The board can be armed only when connected to USB - PC if it is not connected to PC it cannot be armed and the green light don’t come up. I measured the voltage on BEC ant it is 5.05V which is sufficient.
So basically the board is useless (except if I fly may quad with a laptop tied to it)

Is the Receiver powered when not connected to USB?

Yes over ESC BEC and I measured it wit multimeter it s 5.05V. Also the red LED starts up bright but when I connect the TX-RX the led loses on brightness (also powered the RX separately not using ESC BEC and FC)

That sounds a lot like a faulty rx or a bec.
Have you checked for shorts ?

Hello
I checked even connected each ESC separately, I didn’t get any documentation with the FC so I don’t know did I connect everything ok so I am posting a picture to show you.
Also I supplied RX throe FC and separately (the picture is separately situation)

Please help!

Going back to basics..
If you are using a stand alone BEC then you must remove the VCC line from all ESC (The middle positive wire); if you're using the internal BEC of the ESC then only one ESC must be kept with the VCC connected, on all the remaining ones the wire must be removed.

Have you done this ?

(I know some people will scream at me that this is only necessary with switching BEC)

fuh thanks for fast replay, I use ESC bec and as I mentioned I tried with each one separately so in more than one occasion (4 to be exact) only one + line form ESC was connected to FC.
Also I set up “arming” on aux 1 so it’s easier and not confusing

P.S.
A even flashed config.h thinking that would help but it didn’t
Setup:
#define QUADX
#define FLYDUINO_MPU
#define MINTHROTTLE 1150

The only thing I didn’t knew what to do and it bugs me in config.h is "battery voltage monitoring" as I can see its set up for 3S lipo and I am using 2S lipo but I thought that is for the buzzer.
Also my RX is FS-R9B

Also when not on USB the ESC gives the sound Bip - Bip- Bip couninuesly!

Ok the beeping is because you haven't calibrated the ESC with the no fly option. What is confusing me and pointing me to a electrical question is the led loosing it's brightness, Exactly which led looses brightness ?

Battery voltage is not related because it's only a display metric so you can ignore it for now.

Do try to clear the EEPROM using the Arduino example sketch but it won't solve the brightness issue.

Fuh
I did the "calibrated the ESC with the no fly option" as I did the RX ESC calibration and thy work fine when connected to USB the single beep happens only when connected without USB,
Also don the GUI setup then normal aurdiono and in the end EEPROM. The only thing after doing EEPROM I noticed that it didn't change the AUX arming thin so I don't know did the EEPROM do its thing (don it 2 times)
The LED is the one from the picture above (red) the green one only comes up on USB connection.
Also is the a bow way of connecting correct?

Sometimes if you don't close the GUI between flashes/EEPROM clear it will keep the last settings, btw the EEPROM clear sketch, you'll have to wait for LED D13 to light up (less than 5 seconds after upload)

With everything connected to the board, after plugging the battery what is the voltage on one of the free headers ? Do not measure the BEC directly.

Do you have fail safe mode active on the config ?

Fuh if you ever come to Croatia you have a drink from me
Yes I know about LED flashing (in my case green)
The voltage 5.05V was measured on free pins of FC also last night I measured it on each ESC (disconnected) + 5-5.5V Signal cca 4,7V.

I didn’t configure fail safe mode but if it was it I think then it wouldn’t work with USB ether!

I wish I could help you out but I'm running out of ideas.. :-/

If you power the RX using the ESC directly, are you able to give thr power to it ?

fuh you are really helpful and many thanks for you effort.
One of ESC calibration was done with connecting to RX
Now let me ask you few thing and pleas if you can answer me.
1. When I do EEPROM flash is it normal that the FC keeps arming on aux1 (I ask because I thought it sets up everything to begging)
2. If it works on USB can I make an usb extension from ESC pins to USB and bypass that way if yes what pins ate + and what -
3. I received with FC a 4 wire cable for either J6 or J7 do I contact that to anything it’s a normal cable with female endings (didn’t get any Manuel so don’t know)

Than anybody for answering!

Image from Q 3.


And here is a video of it with USB/without USB

https://www.youtube.com/watch?v=8zihONxmGRY

1) After EEPROM clear or reset on the GUI all configs should be lost, so the aux channel should not arm it.

2) You could but that's not the issue, the ground plane and 5V rail is common within the board, a quick way to test this is to remove the center pin from all ESC and power, this will force the 5V rail to be fed only by USB and the 12V rail by the LiPo. The FC and the RX should be both light up and ESC working.

3) That seems to be a serial or i2c cable.

I also found strange the beeping of the ESC getting more spaced. Do you have then stock or flashed with some firmware ?

The internal BEC of the ESC are rated for how many amps ?

Do you have a dedicated switching BEC you could connect to test ?

1) Well I don’t know why I uploaded the FC started blinking left it for 2 min returned AUX 1 still works that was strange to me. It did change other settings like mintrothel etc.

2. didn’t really understand this (sorry) and the battery is 2S not 3S

ESC is not flashed (didn’t get to that part yet)
ESC(HW30A 30A):
Power input: 5.6V - 16.8V
BEC: 2A

Dedicated BEC is ?? ( I am noob)
Instead of this Dedicated BEC for testing can I connect the FC to home adepter 6V 3A?

fuh thanks for everything
After sending details the seller agreed to send me e new one so I think it is a board fault.
Will post after receiving the new one!