Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[pmgr]

I have noted that using pin mode on digital pin 1 is actually using the UART port bit TX1 used for USB communication.

Perhaps we should shift all 30/36 pins down one i.e. 2 to 31/37?

Regards

L192

This is a very good point. As soon as the Arduino exits the bootloader and enters the sketch, it will no longer be possible to communicate with it through the UART port as it is used in the sketch.
So Luc, take the board out of the setup so all external wires are disconnected, and try uploading immediately after resetting the board (I am not too familiar with this specific board, so not sure how long the delay is before the bootloader exits and or if there is a reset button you can press if the board is already powered on). Maybe there is another way to make it stay in the bootloader and not execute the current sketch.
PmgR

[pmgr]

Actually, there is a reset button on the board, see attached image. Try pushing that and then immediately after uploading the sketch, or the other way around, start the sketch upload, then press the reset button.
PmgR

[r2fpl]

http://overunity.com/17653/pierres-170w-in-1600w-out-looped-very-impressive-build-continued-moderated/msg519722/#msg519722

   !!! ZADIG !!!

[pmgr]

I stand corrected. The Arduino talks to the computer over its own USB pins, not a TX/RX UART, see the schematic here

https://www.arduino.cc/en/uploads/Main/arduino-mega2560-schematic.pdf?

Only thing I can think of is that the Arduino does not stay long enough in the bootloader to establish communication with the PC. So try that reset button trick that I described in the previous post and play with the timing of pressing that button versus pressing the upload button on the PC.

PmgR

[listener191]

I stand corrected. The Arduino talks to the computer over its own USB pins, not a TX/RX UART, see the schematic here

https://www.arduino.cc/en/uploads/Main/arduino-mega2560-schematic.pdf?

Only thing I can think of is that the Arduino does not stay long enough in the bootloader to establish communication with the PC. So try that reset button trick that I described in the previous post and play with the timing of pressing that button versus pressing the upload button on the PC.

PmgR

Hi PmgR,

That's the schematic for the original arduino Mega 2560.

The Chinese imports use the CH340G chip for serial communication.

Tried to find a schematic for this board but failed.

Regards
L192