Arduino Serial Flush is used to flush the data send through Arduino Serially. When we send data on a serial port through arduino then we use the command Serial.print or Serial.

Serial.flush();

It's just a simple function which clears the data on transmitting pin of Arduino.

1. Flush clears the buffer once all outgoing characters have been sent. This function is part of the Stream class, and can be called by any class that inherits from it (Wire, Serial, etc). See the stream class main page for more information.
2. So Nick, please answer this for me: If I have a Pi running Python sitting at a ser.readline waiting for input as a data logger, and it is fed via serial by Arduino taking readings then sending them as a batch with tab delimeters, then using delay(120000) so the batches come in every two minutes, the Python innards probably immediately read in.
3. Not knowing what virtual breadboard does on a normal Arduino it would do the following: Serial.flush clears the buffer and this needs some time normaly you wait minimum for around 100 ms to write/read to that buffer again. As your code runs in setup (so just once) the serial is not available as its still flushing and so your result.

Arduino Clear Serial Input

while(Serial.available());

So, here's the small code which I have also used in the Arduino Serial Write tutorial but now I am using Arduino Serial Flush command too.

• In the above code I have simply added the Arduino Serial Flush code and now it will take a little more time to complete because now it will make sure that all the data has been sent.

Arduino Clear Serial Output

So, that's all for today. I hope you guys have enjoyed this short Arduino Serial Flush tutorial. If you have any questions, please ask in the comments. Take care !!! :)

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Syed Zain Nasir

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I am Syed Zain Nasir, the founder of The Engineering Projects (TEP).I am a programmer since 2009 before that I just search things, make small projects and now I am sharing my knowledge through this platform.I also work as a freelancer and did many projects related to programming and electrical circuitry. My Google Profile+

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