Python Archieven - DomoticX Knowledge Center

Python – CAN Bus uitlezen

By Sebastiaan Posted on 2020-12-17 Geplaatst in CAN-Bus Software, Python Script

Op deze pagina vind je een voorbeeld hoe je CAN Bus uitleest in Python3 Wat heb je nodig? Python library: python-can python-can-3.3.4 Installatie: git clone https://github.com/hardbyte/python-can.git Cloning into ‘python-can’… remote: Enumerating objects: 18, done. remote: Counting objects: 100% …

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Getagd met CAN, CAN Bus, Plugin, Python, Raspberry pi

Python – Multithreading

By Sebastiaan Posted on 2020-06-10 Geplaatst in Python Script

Source: https://www.programiz.com/python-programming/time/sleep Multithreading in Python Before talking about sleep() in multithreaded programs, let’s talk about processes and threads. A computer program is a collection of instructions. A process is the execution of those instructions. A thread is a subset of the process. …

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Getagd met Multithreading, Python

USB – HID human interface device

By Sebastiaan Posted on 2020-06-10 Geplaatst in Randapparatuur op de Raspberry Pi (USB), USB Apparaten

With this python script you can capture keyboard (emulators) and barcode scanners trough evdev (event device), this way the part of code will only execute when the device is sending keys:

from evdev import *
dev = InputDevice('/dev/input/event1')

print(dev)

for event in dev.read_loop():
    if event.type == ecodes.EV_KEY:
        print(categorize(event))

from evdev import *

dev = InputDevice('/dev/input/event1')

print(dev)

for event in dev.read_loop():

if event.type == ecodes.EV_KEY:

print(categorize(event))

output:

key event at 1383327570.147000, 2 (KEY_1), down
key event at 1383327570.147990, 2 (KEY_1), up
key event at 1383327570.148997, 3 (KEY_2), down
key event at 1383327570.150010, 3 (KEY_2), up
key event at 1383327570.151009, 29 (KEY_LEFTCTRL), down
key event at 1383327570.151009, 42 (KEY_LEFTSHIFT), down
key event at 1383327570.152017, 36 (KEY_J), down
key event at 1383327570.153005, 36 (KEY_J), up
key event at 1383327570.154004, 29 (KEY_LEFTCTRL), up
key event at 1383327570.155005, 32 (KEY_D), down
key event at 1383327570.155993, 32 (KEY_D), up
key event at 1383327570.157002, 48 (KEY_B), down
key event at 1383327570.158015, 48 (KEY_B), up
key event at 1383327570.158997, 48 (KEY_B), down
key event at 1383327570.282002, 18 (KEY_E), up
key event at 1383327570.283004, 49 (KEY_N), down
key event at 1383327570.284005, 49 (KEY_N), up
key event at 1383327570.284968, 18 (KEY_E), down

key event at 1383327570.147000, 2 (KEY_1), down

key event at 1383327570.147990, 2 (KEY_1), up

key event at 1383327570.148997, 3 (KEY_2), down

key event at 1383327570.150010, 3 (KEY_2), up

key event at 1383327570.151009, 29 (KEY_LEFTCTRL), down

key event at 1383327570.151009, 42 (KEY_LEFTSHIFT), down

key event at 1383327570.152017, 36 (KEY_J), down

key event at 1383327570.153005, 36 (KEY_J), up

key event at 1383327570.154004, 29 (KEY_LEFTCTRL), up

key event at 1383327570.155005, 32 (KEY_D), down

key event at 1383327570.155993, 32 (KEY_D), up

key event at 1383327570.157002, 48 (KEY_B), down

key event at 1383327570.158015, 48 (KEY_B), up

key event at 1383327570.158997, 48 (KEY_B), down

key event at 1383327570.282002, 18 (KEY_E), up

key event at 1383327570.283004, 49 (KEY_N), down

key event at 1383327570.284005, 49 (KEY_N), up

key event at 1383327570.284968, 18 (KEY_E), down

Another python script example:

import evdev
from evdev import InputDevice, categorize  # import * is evil :)
dev = InputDevice('/dev/input/event1')

# Provided as an example taken from my own keyboard attached to a Centos 6 box:
scancodes = {
    # Scancode: ASCIICode
    0: None, 1: u'ESC', 2: u'1', 3: u'2', 4: u'3', 5: u'4', 6: u'5', 7: u'6', 8: u'7', 9: u'8',
    10: u'9', 11: u'0', 12: u'-', 13: u'=', 14: u'BKSP', 15: u'TAB', 16: u'Q', 17: u'W', 18: u'E', 19: u'R',
    20: u'T', 21: u'Y', 22: u'U', 23: u'I', 24: u'O', 25: u'P', 26: u'[', 27: u']', 28: u'CRLF', 29: u'LCTRL',
    30: u'A', 31: u'S', 32: u'D', 33: u'F', 34: u'G', 35: u'H', 36: u'J', 37: u'K', 38: u'L', 39: u';',
    40: u'"', 41: u'`', 42: u'LSHFT', 43: u'\\', 44: u'Z', 45: u'X', 46: u'C', 47: u'V', 48: u'B', 49: u'N',
    50: u'M', 51: u',', 52: u'.', 53: u'/', 54: u'RSHFT', 56: u'LALT', 100: u'RALT'
}
for event in dev.read_loop():
    if event.type == evdev.ecodes.EV_KEY:
        data = evdev.categorize(event)  # Save the event temporarily to introspect it
        if data.keystate == 1:  # Down events only
            key_lookup = scancodes.get(data.scancode) or u'UNKNOWN:{}'.format(data.scancode)  # Lookup or return UNKNOWN:XX
            print u'You Pressed the {} key!'.format(key_lookup)  # Print it all out!

import evdev

from evdev import InputDevice, categorize # import * is evil :)

dev = InputDevice('/dev/input/event1')

# Provided as an example taken from my own keyboard attached to a Centos 6 box:

scancodes = {

# Scancode: ASCIICode

0: None, 1: u'ESC', 2: u'1', 3: u'2', 4: u'3', 5: u'4', 6: u'5', 7: u'6', 8: u'7', 9: u'8',

10: u'9', 11: u'0', 12: u'-', 13: u'=', 14: u'BKSP', 15: u'TAB', 16: u'Q', 17: u'W', 18: u'E', 19: u'R',

20: u'T', 21: u'Y', 22: u'U', 23: u'I', 24: u'O', 25: u'P', 26: u'[', 27: u']', 28: u'CRLF', 29: u'LCTRL',

30: u'A', 31: u'S', 32: u'D', 33: u'F', 34: u'G', 35: u'H', 36: u'J', 37: u'K', 38: u'L', 39: u';',

40: u'"', 41: u'`', 42: u'LSHFT', 43: u'\\', 44: u'Z', 45: u'X', 46: u'C', 47: u'V', 48: u'B', 49: u'N',

50: u'M', 51: u',', 52: u'.', 53: u'/', 54: u'RSHFT', 56: u'LALT', 100: u'RALT'

}

for event in dev.read_loop():

if event.type == evdev.ecodes.EV_KEY:

data = evdev.categorize(event) # Save the event temporarily to introspect it

if data.keystate == 1: # Down events only

key_lookup = scancodes.get(data.scancode) or u'UNKNOWN:{}'.format(data.scancode) # Lookup or return UNKNOWN:XX

print u'You Pressed the {} key!'.format(key_lookup) # Print it all out!

Output: …

USB – HID human interface device Read more »

Getagd met Barcode, EVDEV, HID, Human Interface Device, Keyboard, Python

Apparaat – RS232 – Seriële communicatie

By Sebastiaan Posted on 2018-12-08 Geplaatst in C++ Script (Arduino), Diverse onderwerpen (Arduino), Diverse onderwerpen (Raspberry Pi), Python Script, Sensor en Module

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

By Sebastiaan Posted on 2018-04-16 Geplaatst in P1 poort slimme meter, Python Script

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

By Sebastiaan Posted on 2018-02-24 Geplaatst in Modbus Software, Python libraries

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 …

Python Library – pymodbusTCP Read more »

Getagd met bibliotheek, programmeren, pymodbusTCP, Python

Python Library – pymodbus

By Sebastiaan Posted on 2017-10-13 Geplaatst in Modbus Software, Python libraries

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
  Downloading https://www.piwheels.hostedpi.com/simple/pymodbus3/pymodbus3-1.0.0-py3-none-any.whl (76kB)
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Collecting six (from Automat>=0.3.0->twisted>=12.2.0->pymodbus3)
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Collecting attrs (from Automat>=0.3.0->twisted>=12.2.0->pymodbus3)
  Downloading attrs-17.4.0-py2.py3-none-any.whl
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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    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

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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Collecting incremental>=16.10.1 (from twisted>=12.2.0->pymodbus3)

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Collecting zope.interface>=4.0.2 (from twisted>=12.2.0->pymodbus3)

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Collecting Automat>=0.3.0 (from twisted>=12.2.0->pymodbus3)

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Collecting six (from Automat>=0.3.0->twisted>=12.2.0->pymodbus3)

Downloading six-1.11.0-py2.py3-none-any.whl

Collecting attrs (from Automat>=0.3.0->twisted>=12.2.0->pymodbus3)

Downloading attrs-17.4.0-py2.py3-none-any.whl

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

Found existing installation: setuptools 33.1.1

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

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 …

Python Library – pymodbus Read more »

Getagd met bibliotheek, Library, programmeren, pymodbus, Python

Python – POST data naar PHP script

By Sebastiaan Posted on 2017-10-05 Geplaatst in Python 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)

By Sebastiaan Posted on 2017-09-27 Geplaatst in Python libraries

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)

By Sebastiaan Posted on 2017-09-24 Geplaatst in Modbus Software

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

Tag: Python