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1. Python Serial Module Example
2. Python Check If Serial Available

I am searching for a simple method to list all available com port on a PC. I have found this method but it is Windows-specific: Listing serial (COM) ports on Windows? I am using Python 3. Feb 10, 2017  Hi. I'm receiving serial data from an Arduino over USB the data comes at anytime, could be 30 minutes between messages. I have the following while loop that does the job but it prints an empty line ever loop. On the Arduino I can do 'while (Serial.available' How could this be done in Python. What is the equivalent of Serial.available. Is ubiquitous in Arduino C serial communications. Do python developers typically use another idiom to accomplish the.

When I am trying to read multiple lines of serial data on an Arduino, I use the following idiom:

In Arduino C, Serial.available() returns the number of bytes available to be read from the serial buffer (See Docs). What is the equivalent of Serial.available() in python?

For example, if I need to read multiple lines of serial data I would expect to ues the following code:

4 Answers

The property Serial.in_waiting returns the 'the number of bytes in the receive buffer'.

This seems to be the equivalent of Serial.available()'s description: 'the number of bytes .. that's already arrived and stored in the serial receive buffer.'

Try:

For versions prior to pyserial 3.0, use .inWaiting(). To determine your pyserial version, do this:

I have written my code as below. Hope you can use it modify your code

I solved the same problem like so. The only drawback of this code is that when the first time I'm sending letter 'a', ser.inWaiting() will return 0. To remove this effect I added delay of 1 second before it. That seems to solve the problem.

In my case, ATmega16 sends back a string either 8 or 12bits. So, I will get the number of bits arriving to RPi with ser.inWaiting() and then I'll read that much data with ser.read(), combining them into ser.read(ser.inWaiting())

A correct answer will depend on the version of Python - this has tripped me up for some time today. I suspect some of the comments were running on Raspberry Pi which is currently at Python 2.7.9 and similarly less-than-current pySerial.

So on a Pi you might use ser.inWaiting() which is similar to Serial.available() in Arduino C - both return the number of bytes in the receive buffer; for pySerial >= 3.0 you use ser.in_waiting (note this is an attribute not a function - http://pyserial.readthedocs.io/en/latest/pyserial_api.html#serial.Serial.in_waiting)

Incidentally, on a Pi (and presumably older Pythons/pySerials) import serial ; print (serial.__version__) results in an attribute error but works on newer versions.

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

Overview¶

This module encapsulates the access for the serial port. It provides backendsfor Python running on Windows, OSX, Linux, BSD (possibly any POSIX compliantsystem) and IronPython. The module named “serial” automatically selects theappropriate backend.

It is released under a free software license, see LICENSE for moredetails.

Copyright (C) 2001-2016 Chris Liechti <cliechti(at)gmx.net>

Other pages (online)

• Download Page with releases (PyPi)
• This page, when viewed online is at https://pyserial.readthedocs.io/en/latest/ orhttp://pythonhosted.org/pyserial/ .

Features¶

• Same class based interface on all supported platforms.
• Access to the port settings through Python properties.
• Support for different byte sizes, stop bits, parity and flow control withRTS/CTS and/or Xon/Xoff.
• Working with or without receive timeout.
• File like API with “read” and “write” (“readline” etc. also supported).
• The files in this package are 100% pure Python.
• The port is set up for binary transmission. No NULL byte stripping, CR-LFtranslation etc. (which are many times enabled for POSIX.) This makes thismodule universally useful.
• Compatible with io library
• RFC 2217 client (experimental), server provided in the examples.

Requirements¶

• Python 2.7 or Python 3.4 and newer
• If running on Windows: Windows 7 or newer
• If running on Jython: “Java Communications” (JavaComm) or compatibleextension for Java

For older installations (older Python versions or older operating systems), seeolder versions below.

Installation¶

This installs a package that can be used from Python (importserial).

To install for all users on the system, administrator rights (root)may be required.

From PyPI¶

pySerial can be installed from PyPI:

Using the python/python3 executable of the desired version (2.7/3.x).

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Developers also may be interested to get the source archive, because itcontains examples, tests and the this documentation.

From Conda¶

pySerial can be installed from Conda:

Currently the default conda channel will provide version 3.4 whereas theconda-forge channel provides the current 3.x version.

Conda: https://www.continuum.io/downloads

From source (zip/tar.gz or checkout)¶

Download the archive from http://pypi.python.org/pypi/pyserial orhttps://github.com/pyserial/pyserial/releases.Unpack the archive, enter the pyserial-x.y directory and run:

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Using the python/python3 executable of the desired version (2.7/3.x).

Packages¶

There are also packaged versions for some Linux distributions:

• Debian/Ubuntu: “python-serial”, “python3-serial”
• Fedora / RHEL / CentOS / EPEL: “pyserial”
• Arch Linux: “python-pyserial”
• Gentoo: “dev-python/pyserial”

Note that some distributions may package an older version of pySerial.These packages are created and maintained by developers working onthese distributions.

References¶

• Python: http://www.python.org/
• Jython: http://www.jython.org/
• IronPython: http://www.codeplex.com/IronPython

Python Serial Module Example

Older Versions¶

Python Check If Serial Available

Older versions are still available on the current download page or the olddownload page. The last version of pySerial’s 2.x series was 2.7,compatible with Python 2.3 and newer and partially with early Python 3.xversions.

pySerial 1.21 is compatible with Python 2.0 on Windows, Linux and severalun*x like systems, MacOSX and Jython.

On Windows, releases older than 2.5 will depend on pywin32 (previously known aswin32all). WinXP is supported up to 3.0.1.