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Topic: Loop Back Test Failed (Read 929 times) previous topic - next topic


Nov 16, 2012, 02:09 pm Last Edit: Nov 16, 2012, 02:35 pm by elve96 Reason: 1

then the avrdude message is displayed

What avrdude message?

avrdude: stk500_getsync(): not in sync: resp = 0x00

Coding Badly

Do you have the correct board selected (Tools menu)?


Hi, yes (for my board Uno and OS) I have the correct Board selected under Tools > Board > Uno, also under Tools > Serial Port > COM 3 is selected, I check that prior to verify/uploading code. This has worked well for over a year now no problems until now?

Coding Badly

The TX and RX pins should "idle" high.  Do you have a voltmeter?  If you do, with the board powered, carefully check the voltage on TX and RX.  Do they both measure 5 volts?

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