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7 votes
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What is the default baud rate without calling Serial.begin?

There is no default baud rate. When the sketch starts, the serial port is disabled (thus non-functional). Calling Serial.begin() enables the port.
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2 votes
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Sending float values from Python to Arduino using Serial communication

There are two things going on here. First of all, if you look up the readline() method in Python that is referenced in the PySerial manual, you'll see the following: readline(size=- 1, /) Read and ...
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  • 91
2 votes
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USB-C to USB-C cable Arduino is not responding even not powered by this cable

That Nano is not USB-C compliant. Yes, it has the connector, but it doesn't do all the required handshaking to put the USB-C port on the laptop into host (and provide power) mode. This is needed ...
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1 vote

Externally powering Arduino while reading voltage off it via USB

Pin 13 is a digital pin, it does not have the capability to read voltage. You need to use one of the analog pins to read voltage, they are prefixed with the letter "A" (A0 for example). You ...
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  • 1,416
1 vote

How to receive data from Xbee in AT mode on Arduino Nano

You connected the Xbee to the single hardware Serial interface that the Nano has. Is is also used by the USB to Serial chip, which connects to the Serial Monitor. So what you are sending to the Xbee ...
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1 vote
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Ubuntu Serial Port Briefly showing on arduino IDE

This could be happening because Brltty application. Remove it and try again. sudo apt remove brltty sudo apt autoclean && sudo apt autoremove
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