Let’s look at code to understand it better. Device recognises the function and responses accordingly. We send some sequence of bytes to PSLab device, every sequence of bytes corresponds to a unique function which is already written in device’s firmware. Inside the version read function we need to send some bytes to the device in order to obtain the version string from device as a byte response. In PSLab we obtain a serial object and implement custom methods to handle communication which isn’t directly provided by pySerial, for example if we need to implement a function to get the version of the PSLab device connected. Now this “ser” is an object of Serial class that provides all the functionalities through its interface. You can specify other properties like timeout, stopbits, etc to Serial constructor.Ĭomplete list of parameters is available here. Once it’s installed we can now import it in our python script for use. You can install pySerial using pip by following command pip install pyserial How to Install pySerial and obtain serial object for communication? We are using this module to create custom read and write functions. Users can send string (which is an array of bytes) or any other data type all data types can be expressed as byte string using struct module in python, read a specific number of bytes or read till some specific character like ‘ ’ is encountered.

Serial data transfer is easier using this module, you just need to open a port and obtain serial object, which provides useful and powerful functionality. PySerial is a python module which is used to communicate serially with microcontroller devices like Arduino, RaspBerry Pi, PSLab (Pocket Science Lab), etc. How to read and write data back to PSLab device? We will discuss how to communicate efficiently from PC to a device like PSLab itself using pySerial module. We need well structured methods to establish communication between PC and PSLab device and this is where pySerial module comes in. The power for the hardware device is provided by the host through USB which in this case is a PC. The PSLab device is connected to PC via USB cable. In the PSLab Desktop App we use Python for communication between the PC and PSLab device.

Sending string over pyserial