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

[TinselKoala]

Hello Luc,

in my opinion, the influence of the magnetic field is probably the cause of the problem.
The easiest way is to remove the magnetic field to transfer the program.
For that, maybe you just have to unplug the GND.

FR
à mon avis, l'influence du champ magnétique est probablement à l'origine du problème.
Le plus simple, est de supprimer le champ magnétique pour transférer le programme.
Pour cela, peut-être qu'il suffit de débrancher seulement la GND.

I disagree. I don't think that the magnetic field could be causing the problem. At least magnetic fields have never caused any problems with my own Arduinos. (I use UNOs, Megas, and ProMinis for many projects.)

However I _do_ think it is possible that something in the external circuitry and/or power supply may be causing the problem. So I'd like to see Luc try programming the Mega with it disconnected totally from the external circuitry. Then if the program uploads properly, the Mega can be reconnected to the external circuits and we can see what happens then. If the program will still not upload even with nothing connected to the Mega except the programming USB cable... AND if I can get the sketch to upload properly to my own Mega using Windows here at my lab... then we may suspect a hardware problem with Luc's Mega board.

[listener191]

The untested code that I listed for 30 slots, would have required OR gates on the L298N enable inputs, otherwise there would be Output pin clashes for the enable lines.

I now have 5  unique sequences use for enable that avoid that issue.

I just mention this in case this code was used by anybody.

Regards

L192

[r2fpl]

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

I agree too !

[dole]

Definitely TX/RX problem (pin 0,1)
Solution:
Push reset baton and upload immediately or disconnect/connect and immediately upload
But probably same problem will still persist next time.
Do not use 0,1 

d.

[listener191]

Yeah, it's just the port by the looks of it.
Nothing wrong with the code.
At the bottom of your screen it shows you've selected the right type of Arduino and indeed it compiles fine. The only thing different would be the Port.
Click 'Tools', then 'Port' and see what it says there...you should only have 1 or 2 to select from and it seems like it's picking the wrong one as default.

Another way, is to unplug the Arduino USB cable and plug it back in, the other port will then be selected. At least here on Linux Mint it does, from USB0 to USB1 even if it's the same device being plugged in and out.

With the Chinese 2560 boards USB is on Com 4 not 1, as you would expect from an original.

L192