Communication is to be established between two devices to transfer data between them. Generally, two types of communication are used in telecommunication and data communication. They are,
For more details check out pyserial documentation. Check what serial ports are available on your machine. To get a list of available serial ports use. Python -m serial.tools.listports. PySerial includes a small console based terminal program called serial.tools.miniterm. It can be started with python-m serial.tools.miniterm portname (use option -h to get a listing of all options).
Serial Communication
Parallel Communication
In Serial Communication only one bit is sent at a time. So only one wire is required to send data. In parallel communication generally, eight or more wires are used. Serial communication is preferred since no of wires used is less, reduces the cost of distance communication.In this post, serial communication using python programming is explained.
Since Serial Communication is to be established between two devices, Arduino is used as another device in this post. Arduino is programmed to send ‘Reply from Arduino‘ when it receives ‘s‘ from the computer using Python. To know more about Arduino click here.
ARDUINO CODE:
Python Serial Port Programming Free
OUTPUT OF SERIAL MONITOR:
PYTHON CODE:
Python Serial Port Programming Download
To install the module for serial in python the following command is used.
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Port – The port name to which the device is attached to. It can be found using Device Manager.
Baudrate – Data transfer speed in bits per second. The baud rate of the two devices should be same to establish communication.
read(No_of_characters) – To read the no of characters specified in the parameter.
Python Read Serial Port
readline() – To read until a line space or ‘n’.
write() – To write to serial port.
Python Serial Port Programming
OUTPUT:
To develop your projects with Arduino or ESP8266 on Raspberry Pi basis, one may need to access the serial port for the update. This tutorial should work on all distributions of Linux and Raspbian in particular. I wrote this tutorial because I needed to access messages from my Gateway MySensors ESP8266 plugged into the USB port of my Raspberry Pi 3.
Contents
2 Read on the serial port
2.2 Find the ttyUSB port that corresponds to your device
Depending on the version of python, there are several commands to install the package pyserial. To know the version of python run
If the pip command is available (run pip to see if return or not command not found bash) run (replace with pip2 and pip3 based on the python version used).
Otherwise through apt-get
Free serial port
Before going any further, check that the console is not listening on the serial port. To do this run
Then follow the images
Find the ttyUSB port that corresponds to your device
There are several ways to determine the USB port to which the device is connected. For options go here. The fastest is to connect the unit to the USB port then to immediately run the command dmesg -s 1024.
You’ll get directly the tty port on which it is connected.
Python code to read the serial port
Open nano
And copy the following code
Register with the combination Ctrl + X then Y by giving a name to the file (for example read_serial.py).
Now, launch the program to read messages sent on the serial port from your device (for example an Arduino).