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[on:]

I run "Dimmer" example with Mega 2560, but it can't receive or response to the serial data that is sent from processing program. I have UNO, it communicate with processing progarm propably. Any special setup is needed for Mega 2560? Running "Fade", "Digital read serial" example with Mega 2560 are ok, so it should not be the problem of downloading or pin failure. Please help.

[Reply #1 on:]

i am having the same problem? any help?

[Reply #2 on:]

It might be that the Processing program starts transmitting too soon and so the bootloader on the Mega 2560 never times out (and starts the Dimmer sketch).  Try adding a delay() to the end of the setup() function in the Processing program.  Or check, in the Processing program, that millis() > 5000 (or so) in order to send data over the serial port.

[Reply #3 on:]

Well, this is the same problem I have reported, too, and for a while I've given up. Thought that hordes of (un)happy Mega2650 owners by now would have provoked Processing to fix their Serial - or tell us about a new driver. Interesting that it works with a UNO, it too uses the new-USB/Serial chip/driver, right?

Seems not so, yet.

I tried the delay - makes no difference.

[Reply #4 on:]

twwong: Can you try my Arduino/Processing program pair from this post on both your 2560 and UNO and tell us how much/little works, in particular if it is only in one direction?

[Reply #5 on:]

Anyone here was lucky enough to find a solution?
If not, I find this to be quite crazy that the Mega and processing simply do not perform well together and no one has addressed this problem