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I have 2 arduino Unos where each one works properly on its own.

I try to make them communicate with each other using serial communication (TX-RX ports).

When I try to upload my code to them I get this error : 

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
An error occurred while uploading the sketch

what should i do to fix it ? (MY os is windows 10) thanks

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2
  • Please show us how you have connected the 2 Arduinos together and the sketches you are trying to upload.
    – VE7JRO
    Feb 3, 2018 at 1:58
  • 1
    have you tried to load the sketch while the arduino has nothing connected to any of the pins?
    – jsotola
    Feb 3, 2018 at 2:37

1 Answer 1

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Pins 0 and 1 on the Arduino Uno are used for serial communication with the computer over USB, including uploading sketches. If you connect anything to those pins you can interfere with the upload process.

To communicate between the two boards using serial communication without using pins 0 and 1 you can do software serial on other pins: https://www.arduino.cc/en/Reference/SoftwareSerial

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