{"id":519,"date":"2013-10-01T19:02:04","date_gmt":"2013-10-01T19:02:04","guid":{"rendered":"http:\/\/www.horter.de\/blog\/?p=519"},"modified":"2023-01-14T18:25:18","modified_gmt":"2023-01-14T18:25:18","slug":"i2c-input-am-raspberry-pi","status":"publish","type":"post","link":"https:\/\/www.horter.de\/blog\/i2c-input-am-raspberry-pi\/","title":{"rendered":"I2C-Input am PI mit Python einlesen"},"content":{"rendered":"

Vielen Dank an Jochen H. der mir folgenden Artikel geschrieben hat:<\/p>\n

 <\/p>\n

\"I2C-Eingabekarte<\/a>

I2C-Eingabekarte am Raspberry PI<\/p><\/div>\n

Das I2C-Input-Modul 5 – 24V der Firma Horter kann sehr gut vom Raspberry Pi ausgelesen werden.<\/p>\n

Man schlie\u00dft das Inputmodul einfach an die Busschnittstelle des Raspberry an (siehe oben) und kann mit Hilfe eines kleinen Pythonprogramms den PCF8574 auslesen.<\/p>\n

Unten ist eine von mir geschrieben Pythonklasse, mit deren Hilfe man die Inputsignale auslesen kann.<\/p>\n

Um das Programm ausf\u00fchren zu k\u00f6nnen, muss der I2C-Bus erst aktiviert werden und das Pythonmodul smbus installiert werden. Eine Beschreibung dazu gibts hier (http:\/\/www.skpang.co.uk\/blog\/archives\/575<\/a>).<\/p>\n

PcfIN.py (sollte im selben Ordner sei wie Testprog.py)<\/p>\n

#!\/usr\/bin\/python<\/span>\r\n# -*- coding: utf-8 -*-<\/span>\r\nimport<\/span> smbus\r\nimport<\/span> time<\/span>\r\nports = (<\/span>0xFE,\r\n0xFD,\r\n0xFB,\r\n0xF7,\r\n0xEF,\r\n0xDF,\r\n0xBF,\r\n0x7F)<\/span>\r\nclass<\/span> PcfIn:\r\ndef<\/span> __init__<\/span>(<\/span>self<\/span>, addr, i2cdev = 1<\/span>)<\/span>:\r\nself<\/span>.__addr = addr\r\nself<\/span>.__bus = smbus.SMBus<\/span>(<\/span>i2cdev)<\/span>\r\ndef<\/span> get_ports(<\/span>self<\/span>)<\/span>:\r\nioIn = self<\/span>.__bus.read_byte<\/span>(<\/span>self<\/span>.__addr)<\/span>\r\nport = 1<\/span>\r\nfor<\/span> i in<\/span> range<\/span>(<\/span>0<\/span>,len<\/span>(<\/span>ports)<\/span>)<\/span>:\r\nif<\/span> (<\/span>ioIn | ports[<\/span>i]<\/span> == ports[<\/span>i]<\/span>)<\/span>:\r\nprint<\/span> port\r\nport +=1\r\n<\/span><\/pre>\n
Testprog.py<\/p>\n
#!\/usr\/bin\/python<\/span>\r\n# -*- coding: utf-8 -*-<\/span>\r\nimport<\/span> PcfIN as<\/span> In         #importeiren des Klasse PcfIn<\/span>\r\ninputEins = In.PcfIn<\/span>(<\/span>0x38)<\/span>  #Objekt erstellen mit Bitaddr 0x38<\/span>\r\n                          #beim alten Raspberry (Bitaddr, 0)<\/span>\r\ninputEins.get_ports<\/span>(<\/span>)<\/span>        #Ports abfragen<\/span><\/span><\/pre>\n
 <\/p>\n
Der Beitrag kann auch als pdf-Datei heruntergeladen werden.<\/p>\n
i2c-input_Raspberry<\/a><\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
Vielen Dank an Jochen H. der mir folgenden Artikel geschrieben hat:   Das I2C-Input-Modul 5 – 24V der Firma Horter kann sehr gut vom Raspberry Pi ausgelesen werden. Man schlie\u00dft das Inputmodul einfach an die Busschnittstelle des Raspberry an (siehe… mehr lesen<\/a><\/p>\n","protected":false},"author":3,"featured_media":521,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[254],"tags":[275,118,7,274,161,85,276],"class_list":["post-519","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-das-i2c-input-modul","tag-eingaenge","tag-i2c","tag-pcfin-py","tag-python","tag-raspberry-pi","tag-smbus"],"yoast_head":"\nI2C-Input am PI mit Python einlesen - Horter & Kalb Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.horter.de\/blog\/i2c-input-am-raspberry-pi\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I2C-Input am PI mit Python einlesen - Horter & Kalb Blog\" \/>\n<meta property=\"og:description\" content=\"Vielen Dank an Jochen H. der mir folgenden Artikel geschrieben hat:   Das I2C-Input-Modul 5 – 24V der Firma Horter kann sehr gut vom Raspberry Pi ausgelesen werden. 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