昨天玩了玩18b20，然后今天想起来还有两块从车上扣下来的12864小OLED屏，所以准备研究下
然后发现这个库依旧依旧有人写好了23333
（怪不得树莓那么多人玩）
以下教程不完全参考自（毕竟理论和实际会有出入233）：http://www.dfrobot.com.cn/community/thread-13396-1-1.html
先看看效果图：
这个功能和某宝上的“CPU Info”差不多啊。。。（黑粗翔
下面开始教程：
0x00、硬件连接√：
照例，贴一张树莓的针脚分布图：
按照下面的来对应连接：
| GND | 任意一个0v |
| VCC | 任意一个5v/3.3v |
| D0(SCLK) | 23号物理接口 |
| D1(MOSI) | 19号物理接口 |
| RST | 11号物理接口 |
| DC(数据与命令选择) | 13号物理接口 |
| CS（SPI 片选） | 24号物理接口 |
最好整齐的连上，下图是错误的示范：
请大家不要连的像我的一样这么杂乱（笑
0x01、启动SPI服务
在树莓开机后输入命令：
sudo raspi-config
选“Advanced Options”这一项，找到“SPI”和“I2C”，开启就好。
然后重启树莓派：
sudo reboot
重启后运行指令：
cd /dev ls -al
如果你看到了这两项，就说明刚才的设置成功了：
0x02、安装SPI屏幕的库：
先安装必要组件：
sudo apt-get update sudo apt-get install build-essential python-dev python-pip sudo pip install RPi.GPIO sudo apt-get install python-imaging python-smbus sudo apt-get install git
然后，将SPI屏驱动函数的库下载下来：
cd ~ git clone https://git.oschina.net/chenxuuu/Adafruit_Python_SSD1306.git #这里我换成了国内源，为的是速度快一些，原地址：https://github.com/adafruit/Adafruit_Python_SSD1306.git
安装Python的SPI驱动模块：
cd Adafruit_Python_SSD1306 sudo python setup.py install
0x03、测试程序：
测试Python代码如下：
#!/usr/bin/python/
# coding: utf-8
import time
import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306
import Image
import ImageDraw
import ImageFont
# Raspberry Pi pin configuration:
RST = 17
# Note the following are only used with SPI:
DC = 27
SPI_PORT = 0
SPI_DEVICE = 0
# 128x64 display with hardware SPI:
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST, dc=DC, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE, max_speed_hz=8000000))
# Initialize library.
disp.begin()
# Clear display.
disp.clear()
disp.display()
# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width
height = disp.height
image = Image.new('1', (width, height))
# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)
# Draw a black filled box to clear the image.
draw.rectangle((0,0,width,height), outline=0, fill=0)
# Draw some shapes.
# First define some constants to allow easy resizing of shapes.
padding = 1
top = padding
x = padding
# Load default font.
font = ImageFont.load_default()
# Alternatively load a TTF font.
# Some other nice fonts to try: http://www.dafont.com/bitmap.php
#font = ImageFont.truetype('Minecraftia.ttf', 8)
# Write two lines of text.
draw.text((x, top), 'This is first line', font=font, fill=255)
draw.text((x, top+10), 'This is second line', font=font, fill=255)
draw.text((x, top+20), 'This is third line', font=font, fill=255)
draw.text((x, top+30), 'This is fourth line', font=font, fill=255)
draw.text((x, top+40), 'This is fifth line', font=font, fill=255)
draw.text((x, top+50), 'This is last line', font=font, fill=255)
# Display image.
disp.image(image)
disp.display()至于我用的代码，我也给大家贴出来：
#!/usr/bin/python/
# coding: utf-8
import time
import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306
import Image
import ImageDraw
import ImageFont
import socket
import fcntl
import struct
def get_ip_address(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return socket.inet_ntoa(fcntl.ioctl(
s.fileno(),
0x8915, # SIOCGIFADDR
struct.pack('256s', ifname[:15])
)[20:24])
while True:
# 打开温度传感器文件
tfile = open("/sys/bus/w1/devices/28-0115a83f87ff/w1_slave")
# 读取文件所有内容
text = tfile.read()
# 关闭文件
tfile.close()
# 用换行符分割字符串成数组，并取第二行
secondline = text.split("\n")[1]
# 用空格分割字符串成数组，并取最后一个，即 t=23000
temperaturedata = secondline.split(" ")[9]
# 取 t = 后面的数值，并转换为浮点型
temperature = float(temperaturedata[2:])
# 转换单位为摄氏度
temperature = temperature / 1000
# Raspberry Pi pin configuration:
RST = 17
# Note the following are only used with SPI:
DC = 27
SPI_PORT = 0
SPI_DEVICE = 0
# 128x64 display with hardware SPI:
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST, dc=DC, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE, max_speed_hz=8000000))
# Initialize library.
disp.begin()
# Clear display.
disp.clear()
disp.display()
# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width
height = disp.height
image = Image.new('1', (width, height))
# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)
# Draw a black filled box to clear the image.
draw.rectangle((0,0,width,height), outline=0, fill=0)
# Draw some shapes.
# First define some constants to allow easy resizing of shapes.
padding = 1
top = padding
x = padding
# Load default font.
font = ImageFont.load_default()
# Alternatively load a TTF font.
# Some other nice fonts to try: http://www.dafont.com/bitmap.php
#font = ImageFont.truetype('Minecraftia.ttf', 8)
# Write two lines of text.
draw.text((x, top), "Chenxu's Raspebrry Pi", font=font, fill=255)
draw.text((x, top+10), time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time())), font=font, fill=255)
draw.text((x, top+20), 'The temperature:' + str(temperature), font=font, fill=255)
draw.text((x, top+30), "Pi's ip:", font=font, fill=255)
draw.text((x, top+40), 'eth ip:'+ get_ip_address('eth0'), font=font, fill=255)
draw.text((x, top+50), 'wlan ip:'+ get_ip_address('lo'), font=font, fill=255)
# Display image.
disp.image(image)
disp.display()
time.sleep(5)教程完毕√
更新：
加了个显示内存占用的功能，代码如下
#!/usr/bin/python/
# coding: utf-8
from __future__ import print_function
from collections import OrderedDict
import time
import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306
import Image
import ImageDraw
import ImageFont
import socket
import fcntl
import struct
def get_ip_address(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return socket.inet_ntoa(fcntl.ioctl(
s.fileno(),
0x8915, # SIOCGIFADDR
struct.pack('256s', ifname[:15])
)[20:24])
def meminfo():
meminfo = OrderedDict()
with open('/proc/meminfo') as f:
for line in f:
meminfo[line.split(':')[0]] = line.split(':')[1].strip()
return (format(meminfo['MemFree']) + '/' + format(meminfo['MemTotal']))
while True:
# 打开温度传感器文件
tfile = open("/sys/bus/w1/devices/28-0115a83f87ff/w1_slave")
# 读取文件所有内容
text = tfile.read()
# 关闭文件
tfile.close()
# 用换行符分割字符串成数组，并取第二行
secondline = text.split("\n")[1]
# 用空格分割字符串成数组，并取最后一个，即 t=23000
temperaturedata = secondline.split(" ")[9]
# 取 t = 后面的数值，并转换为浮点型
temperature = float(temperaturedata[2:])
# 转换单位为摄氏度
temperature = temperature / 1000
# Raspberry Pi pin configuration:
RST = 17
# Note the following are only used with SPI:
DC = 27
SPI_PORT = 0
SPI_DEVICE = 0
# 128x64 display with hardware SPI:
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST, dc=DC, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE, max_speed_hz=8000000))
# Initialize library.
disp.begin()
# Clear display.
disp.clear()
disp.display()
# Create blank image for drawing.
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width
height = disp.height
image = Image.new('1', (width, height))
# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)
# Draw a black filled box to clear the image.
draw.rectangle((0,0,width,height), outline=0, fill=0)
# Draw some shapes.
# First define some constants to allow easy resizing of shapes.
padding = 1
top = padding
x = padding
# Load default font.
font = ImageFont.load_default()
# Alternatively load a TTF font.
# Some other nice fonts to try: http://www.dafont.com/bitmap.php
#font = ImageFont.truetype('Minecraftia.ttf', 8)
# Write two lines of text.
draw.text((x, top), "Chenxu's Raspebrry Pi", font=font, fill=255)
draw.text((x, top+10), time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time())), font=font, fill=255)
draw.text((x, top+20), 'The temperature:' + str(temperature), font=font, fill=255)
draw.text((x, top+30), meminfo(), font=font, fill=255)
draw.text((x, top+40), 'eth ip:'+ get_ip_address('eth0'), font=font, fill=255)
draw.text((x, top+50), 'wlan ip:'+ get_ip_address('lo'), font=font, fill=255)
# Display image.
disp.image(image)
disp.display()
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