Arduino serial communication issue

Question

I'm trying to write a simple program to read serial data from Arduino. In the Arduino serial monitor window, everything works fine. In the Python console, each number is on a separate line. In Pycharm, it just shows b' '. I don't know where the problem is.

Arduino Serial Monitor:

Python 3 console:

Pycharm IDE:

b' '

b' '

b' '

b' '

b' '

b' '

b' '

b' '

b' '

b' '

Here is the Python 3 code I am using:

import serial
from time import sleep

Ser = serial.Serial("COM3", 9600, timeout=0)
Counter = 1

while Counter <= 10:
    data = Ser.readline()
    print(data)
    sleep(1)
    Counter += 1
Ser.close()

Arduino code:

void setup() {
    // put your setup code here, to run once:
    Serial.begin(9600);
}

void loop() {
    // put your main code here, to run repeatedly:
    Serial.println(1234567890);
    delay(1000);
}

dlask · Accepted Answer · 2015-12-27 20:59:36Z

1

Perhaps a side effect of timeout=0. I would try this:

import serial

Ser = serial.Serial("COM3", 9600, timeout=1)
data = Ser.readline()
print(data)
Ser.close()

answered Dec 27, 2015 at 20:59

dlask

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3 Comments

Alex Over a year ago

b'1234567890\r\n', How can i convert it to: 1234567890?

dlask Over a year ago

Provided that data = b'1234567890\r\n' then int(data) gives you 1234567890.

IamSierraCharlie Over a year ago

If your data is not numbers (perhaps letters or something else) then use: data = b'1meh7890\r\n' print(data.decode())

Pervez · Accepted Answer · 2019-11-12 17:22:27Z

Try using the AMD module !!

Link to the documentation: https://pypi.org/project/AMD/

AMD is a powerful Data-Science module built especially for data extraction and communication with Arduino. This module automatically filters all escape sequence characters and returns you a piece of data or a list of data from the Arduino!

Install via pip: pip install AMD

Documentation for ardata function in the link: https://github.com/SayadPervez/AMD-SEPERATE-DOCUMENTATION/blob/master/ardata().md

Your entire python code can be replaced with the below two lines!!

from AMD import *
data = ardata(3,lines=10)

Alternatively, you can also use the below modified line to get more functionality

data = ardata('COM3',lines=10,squeeze=False,numeric=True)

The first parameter is the COM port. It can either be a string or an Integer. lines represent the number of lines of data to be read from the serial monitor. squeeze parameter specifies if data has to be compressed.numeric specifies if the expected data is of numeric type(integers or floats).However for your requirement the first two lines of code are enough since the rest are set by default!

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