USB 2 Serial + Ethernet

Hi Everyone,

I’m trying to programm my Arduino Ethernet (without PoE) with help of the Arduino USB 2 Serial, but I can’t get it working.

What I’ve tested so far:

  • The Arduino Ethernet can be programmed via ISP (in my case: MySmartUSB Light).
  • The USB 2 Serial works in that kind of way, that I can access the Arduino via Serial Monitor, so I can read AND write to it. The backloop test was positive.
  • But when I try to upload my Sketch, it says
C:/Users/<user>/AppData/Local/Arduino15/packages/arduino/tools/avrdude6.3.0-arduino9/bin/avrdude -CC:/Users/<user>/AppData/LocalArduino15/packages/arduino/tools/avrdude6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -carduino -PCOM21 -b115200 -D -Uflash:w:C:/Users/<user>/AppData/Local/Temp/arduino_build_643251/test.ino.hex:i 

avrdude: Version 6.3, compiled on Jan 17 2017 at 12:00:53
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:/Users/<user>/AppData/Local/Arduino15/packages/arduino/tools/avrdude6.3.0-arduino9/etc/avrdude.conf"

         Using Port                    : COM21
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

avrdude done.  Thank you.
  • There is a 100nF Cap between USB 2 Serial Reset and Arduino Reset, as it should be. Reset is working (connecting via serial monitor restarts Arduino).
  • Switching between drivers didn’t help. I use Win7 64bit btw.
  • A different pc / ide version neither.

I don’t see why this is not working, what did I miss?

Did you install the CP2102 driver ?

Also avoid USB 3.0 ports as they are known to cause some issues.

is it your own computer from new ?