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• Qt Creator Serial Communication
• Qt Serial Communication Manual
• Qt Serial Communication Chart

I've been trying for more than a week to communicate from raspberry pi (QT C++) to Arduino (Arduino IDE c++) through a serial port but i keep failing.

I did some searching on google, read the example.. and still i didn't succeeded. Ok so the basic thing is that i need to communicate continuously the serial port sent command from Raspberry pi to Arduino. I tried to keep the code as simple as possible.

Initially I'm sending 'J' char from raspberry pi (QT C++) to Arduino (Arduino IDE c++) and waiting on that J, to make the LED blink on Arduino. But it doesn't work. Even I didn't get any sample for interfacing & communicating & sending data raspberry pi (QT C++) to Arduino (Arduino IDE c++). I don't know what is the problem exactly. Kindly help me to solve the issue.

In monitor, 9600 baudrate

I have attached program what I have tried on both side.

main.cpp

Arduino code:

Output Displayed:

Raspberry qt creator ide o/p:

Arduino Ide Output displayed:

2 Answers

I would suggest you to read about how Qt event system works. All Qt IODevice derived classes work asynchronously. You need to use QApplication in order to host its object system. After that, you need to change your code so that it's not blocking io thread of QSerialPort.

I usually use readyRead singal or I use waitForBytesWritten and waitForReadReady combination.You should take a look at the QtSerialPort examples. You'll find there several possible implementations depending on your application needs.

You can try this, it will work fine.

The answer to your question is in the following code:

After you make serial.flush (), you immediately close the port. It is necessary to wait until the data is really sent. For example, using bool QSerialPort :: waitForBytesWritten (int msecs).

Not the answer you're looking for? Browse other questions tagged c++serial-portqt-creatorraspberry-pi3arduino-ide or ask your own question.

I am trying to rig up some basic serial communications in QTI am getting the port COM19 from QSerialPortInfo, and I speaking successfully to the port via Arduino. However, I cannot get anything back via QT.

As you can see, I am trying a simple connection along the lines of the documentation, and one where I write out all the baud rate information. They throw two different errors.

Like I said, I am connecting via arduino to this same port and having success. Any ideas what's wrong?

Any ideas for what I am doing wrong?

My idea is to send commands to the device, and read them back to the console.

dsolimanobaordogbaordog

2 Answers

the code looks a bit confuse. You open all port available and then you try to do something wrong.

NOTE: You use a GUI application like a shell application. It is wrong.

Try:

skypjack

Qt Creator Serial Communication

Starting with the tenth port, his name will be .COM10

Qt Serial Communication Manual

You can reassign the port to a different number in Device Manager

Qt Serial Communication Chart

Not the answer you're looking for? Browse other questions tagged c++qtserial-port or ask your own question.