Tag: Python

Apparaat – RS232 – Seriële communicatie

Het volgende voorbeeld laat zien hoe je HEX strings naar een serieel RS232 apparaat stuurt en dan het “antwoord” uit kan lezen in HEX strings. C++ / Arduino

#include <SoftwareSerial.h>

byte command[2] = {0xAA, 0x41};
byte response[5]; 

SoftwareSerial rs232device(10, 11, SERIAL_8N1); // TX, RX.

void setup() {
  Serial.begin(9600);
  rs232device.begin(9600); 
}

void loop() {
  rs232device.write(command, sizeof(command));
  rs232device.readBytes(response, 5);

  Serial.print(response[0], HEX);Serial.print(" ");
  Serial.print(response[1], HEX);Serial.print(" ");
  Serial.print(response[2], HEX);Serial.print(" ");
  Serial.print(response[3], HEX);Serial.print(" ");
  Serial.println(response[4], HEX);
  delay(500);
}

#include <SoftwareSerial.h>

byte command[2] = {0xAA, 0x41};

byte response[5];

SoftwareSerial rs232device(10, 11, SERIAL_8N1); // TX, RX.

void setup() {

Serial.begin(9600);

rs232device.begin(9600);

}

void loop() {

rs232device.write(command, sizeof(command));

rs232device.readBytes(response, 5);

Serial.print(response[0], HEX);Serial.print(" ");

Serial.print(response[1], HEX);Serial.print(" ");

Serial.print(response[2], HEX);Serial.print(" ");

Serial.print(response[3], HEX);Serial.print(" ");

Serial.println(response[4], HEX);

delay(500);

}

Python / Raspberry Pi

#!/usr/bin/env python

import serial
import time

#-------------------------------------------------------------------------------

def ByteToHex( byteStr ):
    """
    Convert a byte string to it's hex string representation e.g. for output.
    """
    
    # Uses list comprehension which is a fractionally faster implementation than
    # the alternative, more readable, implementation below
    #   
    #    hex = []
    #    for aChar in byteStr:
    #        hex.append( "%02X " % ord( aChar ) )
    #
    #    return ''.join( hex ).strip()        

    return ''.join( [ "%02X " % ord( x ) for x in byteStr ] ).strip()

#-------------------------------------------------------------------------------

def HexToByte( hexStr ):
    """
    Convert a string hex byte values into a byte string. The Hex Byte values may
    or may not be space separated.
    """
    # The list comprehension implementation is fractionally slower in this case    
    #
    #    hexStr = ''.join( hexStr.split(" ") )
    #    return ''.join( ["%c" % chr( int ( hexStr[i:i+2],16 ) ) \
    #                                   for i in range(0, len( hexStr ), 2) ] )
 
    bytes = []

    hexStr = ''.join( hexStr.split(" ") )

    for i in range(0, len(hexStr), 2):
        bytes.append( chr( int (hexStr[i:i+2], 16 ) ) )

    return ''.join( bytes )

#-------------------------------------------------------------------------------

# USB D- = RXD TTL STICK
# USB D+ = TXD TTL STICK

### POORT INSTELLINGEN
ser = serial.Serial()
ser.port = "/dev/ttyUSB0"
ser.baudrate = 9600
ser.parity=serial.PARITY_NONE
ser.stopbits=serial.STOPBITS_ONE
ser.bytesize=serial.EIGHTBITS
ser.timeout=1

try: 
    ser.open()
    print("Connected to: " + ser.portstr)
except Exception, e:
    print "error open serial port: " + str(e)
    exit()

while 1:
  ### METHODE #1
  ser.write([0xAA, 0x41])

  ### METHODE #2
  #ser.write(serial.to_bytes([0xAA,0x41]))

  ### METHODE #3
  #ser.write("\xAA\x41")

  ### METHODE #4
  #ser.write(chr(0xAA))
  #ser.write(chr(0x41))

  ### METHODE #5
  #msg = bytearray([0xAA, 0x41])
  #ser.write(msg)

  #data = ser.read(8) ### AANTAL BYTES LEZEN
  data = ser.readline() ## HELE LIJN LEZEN
  #data = ser.readall() ### ALLES LEZEN

  print "SIZE: ", len(data)
  print "RAW: " + data
  print "HEX1: " + ByteToHex(data)
  print "HEX2: " + data.encode('hex')

  time.sleep(2)

#!/usr/bin/env python

import serial

import time

#-------------------------------------------------------------------------------

def ByteToHex( byteStr ):

"""

Convert a byte string to it's hex string representation e.g. for output.

"""

# Uses list comprehension which is a fractionally faster implementation than

# the alternative, more readable, implementation below

# hex = []

# for aChar in byteStr:

# hex.append( "%02X " % ord( aChar ) )

# return ''.join( hex ).strip()

return ''.join( [ "%02X " % ord( x ) for x in byteStr ] ).strip()

#-------------------------------------------------------------------------------

def HexToByte( hexStr ):

"""

Convert a string hex byte values into a byte string. The Hex Byte values may

or may not be space separated.

"""

# The list comprehension implementation is fractionally slower in this case

# hexStr = ''.join( hexStr.split(" ") )

# return ''.join( ["%c" % chr( int ( hexStr[i:i+2],16 ) ) \

# for i in range(0, len( hexStr ), 2) ] )

bytes = []

hexStr = ''.join( hexStr.split(" ") )

for i in range(0, len(hexStr), 2):

bytes.append( chr( int (hexStr[i:i+2], 16 ) ) )

return ''.join( bytes )

#-------------------------------------------------------------------------------

# USB D- = RXD TTL STICK

# USB D+ = TXD TTL STICK

### POORT INSTELLINGEN

ser = serial.Serial()

ser.port = "/dev/ttyUSB0"

ser.baudrate = 9600

ser.parity=serial.PARITY_NONE

ser.stopbits=serial.STOPBITS_ONE

ser.bytesize=serial.EIGHTBITS

ser.timeout=1

try:

ser.open()

print("Connected to: " + ser.portstr)

except Exception, e:

print "error open serial port: " + str(e)

exit()

while 1:

### METHODE #1

ser.write([0xAA, 0x41])

### METHODE #2

#ser.write(serial.to_bytes([0xAA,0x41]))

### METHODE #3

#ser.write("\xAA\x41")

### METHODE #4

#ser.write(chr(0xAA))

#ser.write(chr(0x41))

### METHODE #5

#msg = bytearray([0xAA, 0x41])

#ser.write(msg)

#data = ser.read(8) ### AANTAL BYTES LEZEN

data = ser.readline() ## HELE LIJN LEZEN

#data = ser.readall() ### ALLES LEZEN

print "SIZE: ", len(data)

print "RAW: " + data

print "HEX1: " + ByteToHex(data)

print "HEX2: " + data.encode('hex')

time.sleep(2)

SIZE:  7
RAW: WAWA
HEX1: 57 41 57 41 00 00 00
HEX2: 57415741000000

SIZE: 7

RAW: WAWA

HEX1: 57 41 57 41 00 00 00

HEX2: 57415741000000

Getagd met Apparaat, Arduino, computer, hex strings, Python, Raspberry pi, RS232, Sensor, Serieel, seriele

P1 poort slimme meter – Telegram uitlezen met Python

Er zijn talloze scripts op het internet te vinden om “eenvoudig” telegrammen uit te lezen afkomstig van de P1 poort, maar je stuit al gauw of de diversiteit van de DSMR versie, instellingen en inhooud, hieronder is mijn DSRM 2.x …

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Getagd met P1 poort, Python, Slimme meter, Telegram, Uitlezen

Python Library – pymodbusTCP

Python pymodbusTCP Voor communicatie van Modbus TCP/IP Niet voor Modbus RTU Modbus ASCII Modbus RTU over TCP Installatie:

sudo apt-get update
sudo apt-get install -y python-dev python-pip
sudo pip install -U pymodbusTCP

sudo apt-get update

sudo apt-get install -y python-dev python-pip

sudo pip install -U pymodbusTCP

Installatie voor Python 3:

sudo apt-get update
sudo apt-get install -y python3 python3-dev python-pip
sudo pip3 install -U pymodbusTCP

sudo apt-get update

sudo apt-get install -y python3 python3-dev python-pip

sudo pip3 install -U pymodbusTCP

Mijn voorbeeld:

#!/usr/bin/env python
from pyModbusTCP.client import ModbusClient

client = ModbusClient(host="192.168.0.0", port=502, auto_open=True, auto_close=True, timeout=10)
data = client.read_holding_registers(0, 1)    # FUNCTIE 03 - Lees register 0, 1 lang
print "Waarde register: ", data[0]
client.close()

#!/usr/bin/env python

from pyModbusTCP.client import ModbusClient

client = ModbusClient(host="192.168.0.0", port=502, auto_open=True, auto_close=True, timeout=10)

data = client.read_holding_registers(0, 1) # FUNCTIE 03 - Lees register 0, 1 lang

print "Waarde register: ", data[0]

client.close()

Informatie (ENG): Summary A simple Modbus/TCP library for Python A simple Modbus/TCP client …

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Getagd met bibliotheek, programmeren, pymodbusTCP, Python

Python Library – pymodbus

Python pymodbus Voor communicatie van Modbus RTU Modbus ASCII Modbus RTU over TCP Niet voor Modbus TCP/IP Installatie:

sudo apt-get update
sudo apt-get install -y python-dev python-pip
sudo pip install -U pymodbus

sudo apt-get update

sudo apt-get install -y python-dev python-pip

sudo pip install -U pymodbus

Installatie voor Python 3:

sudo apt-get update
sudo apt-get install -y python3 python3-dev python-pip
sudo pip3 install -U pymodbus

sudo apt-get update

sudo apt-get install -y python3 python3-dev python-pip

sudo pip3 install -U pymodbus

Collecting pymodbus3
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Installing collected packages: pyserial, incremental, constantly, hyperlink, setuptools, zope.interface, six, attrs, Automat, twisted, pymodbus3
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    Not uninstalling pyserial at /usr/lib/python3/dist-packages, outside environment /usr
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Collecting pymodbus3

Downloading https://www.piwheels.hostedpi.com/simple/pymodbus3/pymodbus3-1.0.0-py3-none-any.whl (76kB)

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Collecting twisted>=12.2.0 (from pymodbus3)

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Installing collected packages: pyserial, incremental, constantly, hyperlink, setuptools, zope.interface, six, attrs, Automat, twisted, pymodbus3

Found existing installation: pyserial 3.2.1

Not uninstalling pyserial at /usr/lib/python3/dist-packages, outside environment /usr

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Found existing installation: six 1.10.0

Not uninstalling six at /usr/lib/python3/dist-packages, outside environment /usr

Successfully installed Automat-0.6.0 attrs-17.4.0 constantly-15.1.0 hyperlink-17.3.1 incremental-17.5.0 pymodbus3-1.0.0 pyserial-3.4 setuptools-38.4.0 six-1.11.0 twisted-17.9.0 zope.interface-4.4.3

Informatie (ENG): Summary Pymodbus is a full Modbus protocol implementation using twisted for its asynchronous …

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Getagd met bibliotheek, Library, programmeren, pymodbus, Python

Python – POST data naar PHP script

In dit voorbeeld laat ik zien hoe je met een Python script een POST kan maken naar een PHP script.

<?php
echo "Hallo " . $_POST["naam"] . "!, Waarde: " . $_POST["waarde"];
?>

<?php

echo "Hallo " . $_POST["naam"] . "!, Waarde: " . $_POST["waarde"];

import urllib2, urllib

# Data gegevens.
mijndata = [("naam", "Wereld"), ("waarde", "5.00")]
mijndata = urllib.urlencode(mijndata)

#LET OP: USER AGENT IS NODIG (anders volgt een 403 forbidden!)
#headers = {"User-Agent": "Mozilla/5.0"}

posturl = "https://webadres/post.php"
verzoek = urllib2.Request(posturl, mijndata)

verzoek.add_header("Content-type", "application/x-www-form-urlencoded")
verzoek.add_header("User-Agent", "Mozilla/5.0")

antwoord = urllib2.urlopen(verzoek).read()
print antwoord

import urllib2, urllib

# Data gegevens.

mijndata = [("naam", "Wereld"), ("waarde", "5.00")]

mijndata = urllib.urlencode(mijndata)

#LET OP: USER AGENT IS NODIG (anders volgt een 403 forbidden!)

#headers = {"User-Agent": "Mozilla/5.0"}

posturl = "https://webadres/post.php"

verzoek = urllib2.Request(posturl, mijndata)

verzoek.add_header("Content-type", "application/x-www-form-urlencoded")

verzoek.add_header("User-Agent", "Mozilla/5.0")

antwoord = urllib2.urlopen(verzoek).read()

print antwoord

Start het python script met: sudo python test.py Output in de console: Hallo Wereld!, Waarde: 5.00 Bron #1 / Bron #2

Getagd met Data, PHP, POST, Python

Python Library – OLED display (luma.oled)

Python OLED library (luma.oled) Informatie (ENG): Display drivers for SSD1306 / SSD1322 / SSD1325 / SSD1331 / SH1106 Python library interfacing OLED matrix displays with the SSD1306, SSD1322, SSD1325, SSD1331 or SH1106 driver using I2C/SPI on the Raspberry Pi and …

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Getagd met bibliotheek, Display, Library, OLED, programmeren, Python, SH1106, SSD1306, SSD1322, SSD1325, SSD1331

Modbus Software – Mbpoll / Modpoll (Windows)

Mbpoll / Modpoll Informatie (ENG) mbpoll is a command line utility to communicate with ModBus slave (RTU or TCP). It uses libmodbus. This is a multiplatform project, the compilation was tested on GNU Linux x86 and x86_64, Microsoft Windows 7 …

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Getagd met Foutcode, mbpoll, Modbus, Modpoll, Python, tabel

Modbus – Foutcode tabel

Informatie (ENG) 1/1/1999 Document v1.01 Overview The following information is taken from the Modicon Web site (modbus.org) and the Modbus application protocol manual. Exception Responses Programming or operation errors are those involving illegal data in a message, no response form …

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Getagd met Foutcode, Modbus, Python, tabel

Python – Laatste LOG regels wegschrijven in ander bestand

Soms komt het eens voor dat je een groot LOG bestand hebt met meetdata, en dat je voor grafieken niet het hele bestand wil doorlopen (i.v.m performance/overflow e.d.), ik heb hier een scriptje gemaakt dat de laatste regels uit een …

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Getagd met LOG, Python, regels

Mechanica Software – CNC-GCode-Controller

CNC G-CODE CONTROLLER Website CNC-GCode-Controller If you use a reprap Controller (like Marlin …) for a CNC machine then this is your Program ;-) Features: Communication with the Controller over com port Basic movements with preview Loading cnc files Preview …

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Getagd met CNC-GCode-Controller, Controller, G-code, GRBL, Python, software