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Rasp-Hack-Afficheur-LCD-Python (voir la source)
Version du 27 janvier 2013 à 17:10
, 27 janvier 2013 à 17:10aucun résumé de modification
{{Rasp-Hack-Afficheur-LCD-NAV}}
{{Rasp-Hack-Afficheur-LCD-NAV}}
The Python code for Adafruit's Character LCDs on the Pi is available on Github at [https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code
https://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code]
There are two files we will be working with:
* '''Adafruit_CharLCD.py''' : contains python class for LCD control
* '''Adafruit_CharLCD_IPclock_example.py''' : code for IP address and date/time calls methods from Adafruit_CharLCD.py
The first file Adafruit_CharLCD.py is a mashup from two different sources of LCD code. Github user lrvick put together a [https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py nice python class]. His work is the baseline that is slowly being changed as we are bringing in more elements from the [https://github.com/arduino/Arduino/tree/master/libraries/LiquidCrystal Arduino LiquidCrystal library].
The easiest way to get the code onto your Pi is to hook up an Ethernet cable, and clone it directly using 'git', which is installed by default on most distros. Simply run the following commands from an appropriate location (ex. "/home/pi"):
<nowiki>apt-get install git
git clone git://github.com/adafruit/Adafruit-Raspberry-Pi-Python-Code.git
cd Adafruit-Raspberry-Pi-Python-Code
cd Adafruit_CharLCD</nowiki>
== Tester ==
You can test the wiring from the previous step by simply running the Adafruit_CharLCD.py python code, as it has a little code it in that will simply display a test message when wired correctly
If you're using a '''Version 2 Raspberry Pi''', pin '''#21''' has been replaced with pin '''#27''' so edit Adafruit_CharLCD.py and change:
def __init__(self, pin_rs=25, pin_e=24, pins_db=[23, 17, '''21''', 22], GPIO = None):
to
def __init__(self, pin_rs=25, pin_e=24, pins_db=[23, 17, '''27''', 22], GPIO = None):
you can use '''nano Adafruit_CharLCD.py''' to edit
<nowiki>chmod +x Adafruit_CharLCD.py
sudo ./Adafruit_CharLCD.py</nowiki>
== L'exemple Horloge + IP ==
{{Ambox
| type = delete
| image = [[File:StopHand.png|40px|alt=Stop]]
| textstyle = color: red; font-weight: bold; font-style: italic;
| text = This script assumes you'll want to display the Ethernet (eth0) IP address. You may want to replace eth0 with wlan0 or wlan1 (etc) for Wireless IP address!
}}
<nowiki>#!/usr/bin/python
from Adafruit_CharLCD import Adafruit_CharLCD
from subprocess import *
from time import sleep, strftime
from datetime import datetime
lcd = Adafruit_CharLCD()
cmd = "ip addr show eth0 | grep inet | awk '{print $2}' | cut -d/ -f1"
lcd.begin(16,1)
def run_cmd(cmd):
p = Popen(cmd, shell=True, stdout=PIPE)
output = p.communicate()[0]
return output
while 1:
lcd.clear()
ipaddr = run_cmd(cmd)
lcd.message(datetime.now().strftime('%b %d %H:%M:%S\n'))
lcd.message('IP %s' % ( ipaddr ) )
sleep(2)
</nowiki>
== Executer le code ==
=== Démarrer l'exemple IP + horloge ===
$ sudo ./Adafruit_CharLCD_IPclock_example.py
=== Résultat ===
Ce que vous devriez voir:
[[Fichier:Rasp-Hack-Afficheur-LCD-Python-01.jpg]]
{{Rasp-Hack-Afficheur-LCD-TRAILER}}
{{Rasp-Hack-Afficheur-LCD-TRAILER}}