{"id":1090,"date":"2015-12-29T12:09:48","date_gmt":"2015-12-29T12:09:48","guid":{"rendered":"http:\/\/www.horter.de\/blog\/?p=1090"},"modified":"2023-01-14T18:33:08","modified_gmt":"2023-01-14T18:33:08","slug":"i2c-module-mit-python-und-tkinter-auf-raspberry-py","status":"publish","type":"post","link":"https:\/\/www.horter.de\/blog\/i2c-module-mit-python-und-tkinter-auf-raspberry-py\/","title":{"rendered":"I2C-Digital-Output-Modul mit Python und TkInter am Raspberry"},"content":{"rendered":"

In diesem Beitrag\u00a0wollen wir zeigen wie man die I2C-Module mit Python ansteuern kann.<\/p>\n

Als Visualisierung bzw. zum Bedienen wird TkInter benutzt.<\/p>\n

 <\/p>\n

Ausg\u00e4nge\u00a0vom I2HA-Modul mit Button-Tasten EIN und AUS schalten<\/h1>\n

Unsere Demo-Bedienoberfl\u00e4che hat acht EIN- und acht AUS-Tasten. Diese werden im Programm hinter den Kommentaren<\/p>\n

#EIN-Button-Layout<\/span><\/p><\/blockquote>\n

und<\/p>\n

#AUS-Button-Layout<\/span><\/p><\/blockquote>\n

definiert.<\/p>\n

So sieht’s aus:<\/p>\n

\"I2C-Output<\/a>

I2C-Output Modul mit Tasten steuern<\/p><\/div>\n

 <\/p>\n

Module importieren und Globale Variable definieren<\/h3>\n

im Hauptprogramm werden einige\u00a0 Module\u00a0importiert.<\/p>\n

Au\u00dferdem braucht jede Ausgabekarte eine globale Variable\u00a0die wir einfach mal o1 f\u00fcr die erste Output-karte nennen<\/p>\n

import<\/span> tkinter
\nfrom<\/span> tkinter import<\/span> *<\/span>
\nfrom<\/span> tkinter import<\/span> ttk
\nimport<\/span> smbus<\/p>\n

bus =<\/span> smbus.<\/span>SMBus(<\/span>1<\/span>)<\/span>
\nmainWin =<\/span> Tk(<\/span>)<\/span>
\nmainWin.<\/span>title(<\/span>‚LED_TEST‘<\/span>)<\/span><\/p>\n

o1 =<\/span> 0<\/span><\/p><\/blockquote>\n

diese Variable wird dann in den Unterprogrammen der Tasten\u00a0manipuliert.<\/p>\n

Falls der Import vom SM-Bus nicht funktioniert muss dieser erst noch auf dem Raspberry-Pi installiert werden. Diese Anleitung hilft dabei recht gut. https:\/\/pypi.python.org\/pypi\/smbus-cffi<\/a><\/p>\n

 <\/p>\n

Funktion Bit setzten \/ r\u00fccksetzten in Variable<\/h3>\n

Das Setzten und das R\u00fccksetzten eines einzelnen Bits in einer Variable haben wir in Funktionen gepackt.
\nDie Ausgabe in die Python Shell kann auch weg gelassen werden.<\/p>\n

#Funktion Setze Bit in Variable \/ Function<\/span> Set<\/span> Bit<\/span> in<\/span> byte<\/span><\/span>
\ndef<\/span> set_bit(<\/span>value,<\/span> bit)<\/span>:<\/span>
\nprint<\/span>(<\/span>value |<\/span> (<\/span>1<\/span><<<\/span>bit)<\/span>)\u00a0\u00a0\u00a0 #Ausgabe in der Python Shell<\/span>
\nreturn<\/span> value |<\/span> (<\/span>1<\/span><<<\/span>bit)<\/span><\/p>\n

#Funktion r\u00fccksetzte Bit in Variable \/ Function<\/span> reset <\/span>Bit<\/span> in<\/span> byte<\/span><\/span>
\ndef<\/span> clear_bit(<\/span>value,<\/span> bit)<\/span>:<\/span>
\nprint<\/span>(<\/span>value &<\/span> ~<\/span>(<\/span>1<\/span><<<\/span>bit)<\/span>)\u00a0\u00a0\u00a0 #Ausgabe in der Python Shell<\/span><\/span>
\nreturn<\/span> value &<\/span> ~<\/span>(<\/span>1<\/span><<<\/span>bit)<\/span><\/p><\/blockquote>\n

 <\/p>\n

Schaltbefehl der Ausg\u00e4nge auf Button<\/h3>\n

Wird z.B. die EIN-Taste\u00a0gedr\u00fcckt, ruft sich das Unterprogramm der entsprechenden Taste auf.<\/p>\n

Beispiel Taste 1 EIN<\/p>\n

def<\/span> button_1e(<\/span>)<\/span>:<\/span>
\nglobal<\/span> o1
\no1 =<\/span> set_bit(<\/span>o1,<\/span> 0<\/span>)<\/span>
\nbus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>–<\/span>set_bit(<\/span>o1,<\/span> 0<\/span>)<\/span>)<\/span><\/p><\/blockquote>\n

In der zweiten Zeile wird angegeben, dass im Unterprogramm die globale Variable o1 verwendet werden soll.<\/p>\n

In der dritten Zeile wird in der globalen Variable das Bit null gesetzt<\/p>\n

In der vierten Zeile wird die Variable invertiert\u00a0und auf den I2C-Bus zum Slave an Adresse 0x20<\/span>\u00a0\u00fcbertragen.<\/p>\n

 <\/p>\n

Programmcode<\/h3>\n
import<\/span> tkinter\r\nfrom<\/span> tkinter import<\/span> *<\/span>\r\nfrom<\/span> tkinter import<\/span> ttk\r\nimport<\/span> smbus\r\n\r\nbus =<\/span> smbus.<\/span>SMBus(<\/span>1<\/span>)<\/span>\r\nmainWin =<\/span> Tk(<\/span>)<\/span>\r\nmainWin.<\/span>title(<\/span>'LED_TEST'<\/span>)<\/span>\r\n\r\no1 =<\/span> 0\r\n<\/span>\r\n#Funktion Setze Bit in Variable \/ Function Set Bit in byte<\/span>\r\ndef<\/span> set_bit(<\/span>value,<\/span> bit)<\/span>:<\/span>\r\n    print<\/span>(<\/span>value |<\/span> (<\/span>1<\/span><<<\/span>bit)<\/span>)<\/span>\r\n    return<\/span> value |<\/span> (<\/span>1<\/span><<<\/span>bit)<\/span>\r\n\r\n#Funktion r\u00fccksetzte Bit in Variable \/ Function reset Bit in byte<\/span>\r\ndef<\/span> clear_bit(<\/span>value,<\/span> bit)<\/span>:<\/span>\r\n    print<\/span>(<\/span>value &<\/span> ~<\/span>(<\/span>1<\/span><<<\/span>bit)<\/span>)<\/span>\r\n    return<\/span> value &<\/span> ~<\/span>(<\/span>1<\/span><<<\/span>bit)<\/span>\r\n\r\n\r\n#Buttonbefehle<\/span>\r\ndef<\/span> button_1e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 0<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_2e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 1<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_3e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 2<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_4e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 3<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_5e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 4<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_6e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 5<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_7e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 6<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_8e(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> set_bit(<\/span>o1,<\/span> 7<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\n\r\n\r\ndef<\/span> button_1a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 0<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_2a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 1<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_3a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 2<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_4a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 3<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_5a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 4<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_6a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 5<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_7a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 6<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\ndef<\/span> button_8a(<\/span>)<\/span>:<\/span>\r\n    global<\/span> o1\r\n    o1 =<\/span> clear_bit(<\/span>o1,<\/span> 7<\/span>)<\/span>\r\n    bus.<\/span>write_byte(<\/span>0x20<\/span>,<\/span>255<\/span>-<\/span>o1)<\/span>\r\n\r\n\r\n#EIN-Button-Layout<\/span>\r\nlabel_1 =<\/span> ttk.<\/span>Label(<\/span>mainWin,<\/span> text=<\/span>'Ein'<\/span>)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>1<\/span>)<\/span>\r\nButton_1 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 1'<\/span>,<\/span> command =<\/span> button_1e)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>2<\/span>)<\/span>\r\nButton_2 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 2'<\/span>,<\/span> command =<\/span> button_2e)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>3<\/span>)<\/span>\r\nButton_3 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 3'<\/span>,<\/span> command =<\/span> button_3e)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>4<\/span>)<\/span>\r\nButton_4 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 4'<\/span>,<\/span> command =<\/span> button_4e)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>5<\/span>)<\/span>\r\nButton_5 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 5'<\/span>,<\/span> command =<\/span> button_5e).<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>6<\/span>)<\/span>\r\nButton_6 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 6'<\/span>,<\/span> command =<\/span> button_6e)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>7<\/span>)<\/span>\r\nButton_7 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 7'<\/span>,<\/span> command =<\/span> button_7e)<\/span>.<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>8<\/span>)<\/span>\r\nButton_8 =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 8'<\/span>,<\/span> command =<\/span> button_8e).<\/span>grid(<\/span>column=<\/span>1<\/span>,<\/span>row=<\/span>9<\/span>)<\/span>\r\n\r\n#AUS-Button-Layout<\/span><\/span>\r\nlabel_1 =<\/span> ttk.<\/span>Label(<\/span>mainWin,<\/span> text=<\/span>'Aus'<\/span>)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>1<\/span>)<\/span>\r\nButton_1a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 1'<\/span>,<\/span> command =<\/span> button_1a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>2<\/span>)<\/span>\r\nButton_2a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 2'<\/span>,<\/span> command =<\/span> button_2a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>3<\/span>)<\/span>\r\nButton_3a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 3'<\/span>,<\/span> command =<\/span> button_3a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>4<\/span>)<\/span>\r\nButton_4a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 4'<\/span>,<\/span> command =<\/span> button_4a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>5<\/span>)<\/span>\r\nButton_5a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 5'<\/span>,<\/span> command =<\/span> button_5a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>6<\/span>)<\/span>\r\nButton_6a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 6'<\/span>,<\/span> command =<\/span> button_6a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>7<\/span>)<\/span>\r\nButton_7a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 7'<\/span>,<\/span> command =<\/span> button_7a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>8<\/span>)<\/span>\r\nButton_8a =<\/span> ttk.<\/span>Button(<\/span>mainWin,<\/span> text=<\/span>'LED 8'<\/span>,<\/span> command =<\/span> button_8a)<\/span>.<\/span>grid(<\/span>column=<\/span>2<\/span>,<\/span>row=<\/span>9<\/span>)\r\n<\/span>\r\nmainWin.mainloop(<\/span>)\r\n\r\n<\/span>\r\n<\/pre>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
In diesem Beitrag\u00a0wollen wir zeigen wie man die I2C-Module mit Python ansteuern kann. Als Visualisierung bzw. zum Bedienen wird TkInter benutzt.   Ausg\u00e4nge\u00a0vom I2HA-Modul mit Button-Tasten EIN und AUS schalten Unsere Demo-Bedienoberfl\u00e4che hat acht EIN- und acht AUS-Tasten. Diese werden… mehr lesen<\/a><\/p>\n","protected":false},"author":3,"featured_media":1228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[254],"tags":[277,7,114,161,108],"class_list":["post-1090","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-digitale-ausgaenge","tag-i2c","tag-i2c-bus","tag-python","tag-raspberry"],"yoast_head":"\nI2C-Digital-Output-Modul mit Python und TkInter am Raspberry - 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-module-mit-python-und-tkinter-auf-raspberry-py\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I2C-Digital-Output-Modul mit Python und TkInter am Raspberry - Horter & Kalb Blog\" \/>\n<meta property=\"og:description\" content=\"In diesem Beitrag\u00a0wollen wir zeigen wie man die I2C-Module mit Python ansteuern kann. Als Visualisierung bzw. zum Bedienen wird TkInter benutzt.   Ausg\u00e4nge\u00a0vom I2HA-Modul mit Button-Tasten EIN und AUS schalten Unsere Demo-Bedienoberfl\u00e4che hat acht EIN- und acht AUS-Tasten. 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