How to read data from serial port? Python

Question

Hi please bear my basic question as I am new to python.
I am trying to read data from serial port. Basically serial port is a USB port converted to serial port virtually. I am using arduino.
First i tried this code:

while(True):
    ser=serial.Serial('COM6',9600)
    bytoread=ser.inWaiting()
    val=ser.read(bytoread)

But it gave me error.

Permission Error(13,Access is denied, none 5)

But when i changed my code to

while(True):
    ser=serial.Serial()
    ser.baudrate=19600
    ser.port='COM6'
    ser
    ser.open()
    bytoread=ser.inWaiting()
    val=ser.read(bytoread)

Permission error did not come but program is always busy connecting the port. I waited for many minutes but it never moved forward. What I am doing wrong here?

Dadep · Accepted Answer · 2017-04-11 14:21:13Z

5

you can do something like :

import serial
ser = serial.Serial('COM6', 9600, timeout=None)

while True:
    data = ser.readline()

you can't put ser = serial.Serial('COM5', 9600, timeout=None) in your while loop because it will permanently (re)create the connection...

answered Apr 11, 2017 at 14:21

Dadep

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