Geeetech

Hello

1. 9VDC
There is 8.84V on 5V pin
Threre is 3.34V on 3.3V pin

2. when connected 5V on 5Vpin
There is 5V on 5Vpin
There is 3.34V on 3.3.V pin

I hope, this will help you

Thank you for your help

Fedor

Hello

You are right.

There is not possible to get Led13 Off.
I can change code by any means but there is no change in behavior of the board.

Yes, you re right - when I connected external power, board is not working.

Thank you for your help

Fedor

Hello

There is only 1.85V on 3.3V pin when 5V is supplied.

Regards

Fedor

Hello I have tried both. Dc - 6V. USB - 5V. When connected DC 6V and when I measure voltage on pin where should be 5V there is much higher voltage than 5.8V. In both cases the board is not recognized by PC when USB conected. I have another board which is working correctly in same condition, so it is...

Hello I do not understand what do you mean with "code you provide". I use code provided e.g. from examples\01.Basics\Blink And using card with correct voltage - external power 9V or USB 5V. On pins 3.3V Nothing with "higher voltage". I now for sure, that if there is higher voltage than allowed it wi...

Hello

I have done it as you described.

There is not LED light neither when connected 9V nor when connected 5V.

Best regards

Fedor

I am sorry, if it is not clear. It is not possible to program the board noways. There is different behavior when connected to different USB port. Take a look at the picture - Native USB port; Programming port http://arduino.cc/en/Main/ArduinoBoardDue You can take a look at schematic too. One way or ...

Hello I think that mega16U2 is OK, because as I wrote before when the board is connect to "Programming port" it is recognized by PC and COM port is assigned. I think that, problem is in main ARM processor, because when connected to "Native port" which is directly connected to ARM, device is not reco...

Hello

I have checked more cables, which worked OK with another board. But still the same - "No device found"

Appearance looks OK, nothing missing or whatever.

I think it is some inner problem in some chip or something like that.

Thank you

Fedor

Hello I have made 3 posts, but they are each for different DUE board with different problem. So I need help with each one. I will write information you will ask to each. This one works this way. 1. When I connect USB to "Programming port", board is not recognized by PC Board could not be programmed ...