树莓派调用oled屏幕

 import time

import Adafruit_GPIO.SPI as SPI

import Adafruit_SSD1306

from PIL import Image

from PIL import ImageDraw

from PIL import ImageFont

import subprocess

# Raspberry Pi pin configuration:

RST = None     # on the PiOLED this pin isnt used

# Note the following are only used with SPI:

DC = 23

SPI_PORT = 0

SPI_DEVICE = 0

# Beaglebone Black pin configuration:

# RST = 'P9_12'

# Note the following are only used with SPI:

# DC = 'P9_15'

# SPI_PORT = 1

# SPI_DEVICE = 0

# 128x32 display with hardware I2C:

disp = Adafruit_SSD1306.SSD1306_128_32(rst=RST)

# 128x64 display with hardware I2C:

# disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST)

# Note you can change the I2C address by passing an i2c_address parameter like:

# disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST, i2c_address=0x3C)

# Alternatively you can specify an explicit I2C bus number, for example

# with the 128x32 display you would use:

# disp = Adafruit_SSD1306.SSD1306_128_32(rst=RST, i2c_bus=2)

# 128x32 display with hardware SPI:

# disp = Adafruit_SSD1306.SSD1306_128_32(rst=RST, dc=DC, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE, max_speed_hz=8000000))

# 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))

# Alternatively you can specify a software SPI implementation by providing

# digital GPIO pin numbers for all the required display pins.  For example

# on a Raspberry Pi with the 128x32 display you might use:

# disp = Adafruit_SSD1306.SSD1306_128_32(rst=RST, dc=DC, sclk=18, din=25, cs=22)

# 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 = -2

top = padding

bottom = height-padding

# Move left to right keeping track of the current x position for drawing shapes.

x = 0

# Load default font.

font = ImageFont.load_default()

# Alternatively load a TTF font.  Make sure the .ttf font file is in the same directory as the python script!

# Some other nice fonts to try: http://www.dafont.com/bitmap.php

# font = ImageFont.truetype('Minecraftia.ttf', 8)

while True:

```python

# Draw a black filled box to clear the image.

draw.rectangle((0,0,width,height), outline=0, fill=0)

# Shell scripts for system monitoring from here : https://unix.stackexchange.com/questions/119126/command-to-display-memory-usage-disk-usage-and-cpu-load

cmd = "hostname -I | cut -d\' \' -f1"

IP = subprocess.check_output(cmd, shell = True )

cmd = "top -bn1 | grep load | awk '{printf \"CPU Load: %.2f\", $(NF-2)}'"

CPU = subprocess.check_output(cmd, shell = True )

cmd = "free -m | awk 'NR==2{printf \"Mem: %s/%sMB %.2f%%\", $3,$2,$3*100/$2 }'"

MemUsage = subprocess.check_output(cmd, shell = True )

cmd = "df -h | awk '$NF==\"/\"{printf \"Disk: %d/%dGB %s\", $3,$2,$5}'"

Disk = subprocess.check_output(cmd, shell = True )

# Write two lines of text.

draw.text((x, top),       "IP: " + str(IP),  font=font, fill=255)

draw.text((x, top+8),     str(CPU), font=font, fill=255)

draw.text((x, top+16),    str(MemUsage),  font=font, fill=255)

draw.text((x, top+25),    str(Disk),  font=font, fill=255)

# Display image.

disp.image(image)

disp.display()

time.sleep(.1)