Python Serial Port Example Windows Product

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Cross Platform serial communication using Python. Serial port named COM24. It on an excel sheet.In this example I will show you how to. Setting up Python to work The serial port a.k.a A few years ago I ve written several posts about working with the serial port using Perl and C on a Windows.

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I've recently gotten my hands on an Arduino (or rather a Genuino, but the overall architecture should be the same) UNO. I'm now using that Arduino to test how data is transmitted from a USB to Serial Connector to the Arduino.

I've already verified that data transmission from Arduino to the PC is possible, by using hTerm and PySerial. However, whenever I send data from Pyserial or hTerm, it doesn't show up in the Arduino serial terminal. Also, I'm using SoftwareSerial to set up a secondary serial terminal to see what the Arduino receives. (I'm using the standard serial port to send data to the terminal, and the SoftwareSerial Port to connect to the USB to Serial Connector.)

Here's my code so far:

Python side:

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The Arduino side looks like this, and is essentially the default example:https://www.arduino.cc/en/Tutorial/SoftwareSerialExample

Python Serial Port Example Windows Product

The Terminal never prints 'Hello User'. Also, no other signals are being printed. By removing the if-condition, I get a whole lot of 'Hello User' and '-1' in the Arduino IDE serial monitor.

Concerning my setup:

I've got an USB to Serial converter, which is connected as 'COM3'. On the other side, I have an Arduino UNO which is connected via USB to the same computer. The TX pin of the converter is connected to the RX pin of the Arduino and vice versa. Also, Ground is connected to Ground. Furthermore, I use Jupyter/IPython notebook to run my Python script, and the default Arduino IDE to compile programs for my Arduino. In the case there I received data from the Arduino, I used the script specified in the URL provided, which is very similar to the one I'm already showing here. Also, ser.write() is replaced by ser.read(1), so that it reads one byte at a time. My system is Windows 7 (64 Bit).

Edit: Here is an established connection between hTerm (a serial terminal) and the Python script while using com0com as a port emulator.

per1234
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2 Answers

Python Serial

What do you think should come out?

I'm no expert with Python but you seem to be using struct pack, which I think prepends a number of bytes to the data to generate a 4 byte word. You are using NULL, 0 to pack the structure. When Serial.println() encounter a NULL it will assume that is the end of the string. So you seem to be printing a zero byte string.

Oh and Serial.read() only reads one byte of data, so there is an issue with that too. I suspect that the write call has a similar issue, you normally need to supply a size parameter because its binary data.

Does that make sense?

Code GorillaCode Gorilla
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When you run your python code, do you see the things you are sending on the screen there?

Python Serial Port Example Windows Product 7

Example

I think you need to be calling ser.open().

Delta_GDelta_G

C# Serial Port Examples

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P: n/a
George T. schreef:
I need to access the serial port via python on a windows machine.
Reading on the web, there are three solutions: pyserial, siomodule and
USPP. pyserial seems to be the best option since the other two are
tested with Windows 95 and older versions of python. Would you agree
with this or have I missed an option?
I hadn't even heard of siomodule and USPP; pyserial is what I use when I
need to read/write from/to the serial port.
Can anyone provide me an example of how to access the serial port with
pyserial?

It's quite simple; there are a number of examples on pyserial's website.
Here's a small quick and dirty script that reads data from a serial port
and broadcasts it as UDP over the network to make the incoming data
available to other computers in the office:
import socket
import sys
import serial
ser = serial.Serial('COM1', 38400, timeout=1)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
while True:
msg = ser.readline()
sock.sendto(msg, ('<broadcast>', 5000))
sys.stdout.write(msg)
Basically you can use the objects like other file-like objects.
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If I have been able to see further, it was only because I stood
on the shoulders of giants. -- Isaac Newton
Roel Schroeven