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Topic: usb serial ft782 with ft232rl intead usb2serial light for arduino ethernet (Read 1 time) previous topic - next topic


Ii all,
I have a converter usb serial based on ft232rl it has 4 male pins gnd, +5v, tx, rx
Is it possible to use it to upload a sketch over arduino ethernet intead using usb2serial light or ftdi cable ?

what pins to connect to arduino ethernet ?

Many thanks,


Yes, it is possible. Connect GND to the pin labelled BLK, leave the next pin unconnected, next pin 5V, then TX and next RX. The last one is the reset line (normally connected to DTR), as you don't have that line you have to reset the Arduino manually by pressing the reset button immediately before you upload your sketch.


ok pylon, but step by step:

>> Connect GND to the pin labelled BLK<<

noone BLK found on arduino eth. neither on ft782 ! what is BLK ?


The serial connector of the Arduino Ethernet has one pin labeled BLK as seen in the official picture:


OOps, i'm so dummy ! in my ethernet labels are printed on the right under curved pins so i didn't seen them !



my serial usb converter you see at


i've made the follow links:

USB/SERIAL FT782     ARDUINO ETHERNET 3 (on curved pins)

     GND --------------> BLK
     +5V  --------------> +5V
     TX    --------------> TX
     RX    --------------> RX

when power pins connected, arduino start the on led permanently, no other.
pressing reset button nothing light.

loading sketch light the ft782 tx, nothing on arduino, not even rx led on ft728

in verbose mode avrdude says:

avrdude: Version 5.11, compiled on Sep  2 2011 at 19:38:36
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Program Files\arduino-1.0.1\hardware/tools/avr/etc/avrdude.conf"

         Using Port                    : \\.\COM4
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: Send: 0 [30]   [20]
avrdude: Send: 0 [30]   [20]
avrdude: Send: 0 [30]   [20]
avrdude: Recv:
avrdude: stk500_getsync(): not in sync: resp=0x00

avrdude done.  Thank you.

seems no response from arduino, perhaps is the boot loader (i never upgrade it) ?


Which pin is TX for you on the Arduino?

On the Arduino you won't see any LED blink during transfer but on my USB2Serial Light both, RX and TX, blink more or less at the same time during the transfer to the Arduino Ethernet.

Can you make a photo of your wiring and post it here?

Edit: Did you remember to reset the Arduino manually shortly before you upload the sketch?

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