[Problem] avrdude: stk500_getsync(): not in syn

I have the following problem trying to upload a very simple program. This is the program:

avrdude: Version 5.4-arduino, compiled on Oct 22 2007 at 13:15:12 Copyright (c) 2000-2005 Brian Dean,

System wide configuration file is "hardware/tools/avrdude.conf" User configuration file is "/home/roberto/.avrduderc" User configuration file does not exist or is not a regular file, skipping

Using Port : /dev/ttyUSB0 Using Programmer : stk500v1 Overriding Baud Rate : 19200 avrdude: Send: 0 [30] [20] avrdude: Send: 0 [30] [20] avrdude: Send: 0 [30] [20] avrdude: Recv: . [06] avrdude: stk500_getsync(): not in sync: resp=0x06 avrdude: Send: Q [51] [20] avrdude: ser_recv(): programmer is not responding avrdude: stk500_recv(): programmer is not responding

The program is:

define BAUDIOS 9600

boolean ejecutar = true; void setup(){ Serial.begin(BAUDIOS); }

void loop(){ if(ejecutar){ Serial.println("AT+iRP11"); ejecutar=false; } }

I have discarded a problem in the hardware, because if only i had the arduino board conected to the usb port and nothing conected to it, the program upload without problems, so I suspect that my circuit it has a problem, (but it is working). The circuit is in the next post (i can upload images with my first post):

I'm not an expert with this, but i thing that it's posible to get the main idea.

Someone can give me a hand?

Thanks a lot! Roberto

The image of the circuit is here. Thanks for the help! Roberto

I have discovered that if I disconnect the pin of TX and RX of arduino, the problem it's avoided. Now, i'm curious to know what is the reason of this. Anybody know? Roberto

i cant see your circuit, but if you have anything on pins 0 or 1 while you try to upload, you can run into problems. those are the pins that connect to the usb interface, and if something else is connected to them, it can interfere with the signals causing a failed program upload. you cant have more than one serial device on the serial lines at a time, if one were to go high and the other low, or the both wrote high one after another, the data would get garbled.

Thanks for your answer. Yesterday I conclude the same... This allow me to understand another things! Thank you again!. Roberto