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I'm running this project with HC-05 https://create.arduino.cc/projecthub/millerman4487/view-serial-monitor-over-bluetooth-fbb0e5 and I am getting connection error. I have ensured my port selected and board is accurate but no such luck. The Arduino uno is powered by 3.7v batt (output ~8v with reg) so it is simply just a battery connection and BT module, but when uploading the sketch, it fails. I am relatively new to arduino, and am not sure where to begin this debug.

I am using PC windows, and using a BT dongle receiver for connection (maybe this affects port comm?)

Thanks in advance

Here us the error message

Arduino: 1.8.13 (Windows Store 1.8.42.0) (Windows 10), Board: "Arduino Uno"

Sketch uses 1954 bytes (6%) of program storage space. Maximum is 32256 bytes.

Global variables use 250 bytes (12%) of dynamic memory, leaving 1798 bytes for local variables. 
Maximum is 2048 bytes.

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for 
suggestions.

avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x04

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x04
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when uploading the code, did you ensure disconnecting the Rx, Tx pins from the Arduino? Coz this is a similar error you get when you upload code with your comm pins connected. Try uploading the code with no wires connected.

4
  • Ok, disconnected Rx, Tx, and was returned with this error
    – user67776
    Sep 9 '20 at 20:52
  • avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x09
    – user67776
    Sep 9 '20 at 20:52
  • Restart your IDE and use a different com port for uploading.
    – N0m4d
    Sep 9 '20 at 20:54
  • 1
    tried, and still no luck
    – user67776
    Sep 9 '20 at 21:10

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