一、材料准备

• 树莓派4b，安装rasbian系统的内存卡，支持IIC协议的OLED屏幕，杜邦线

  二、接线

  树莓派 oled
  3.3v –> VCC (VDD)
  GPIO2(SDL) –> SDL(SDA)
  GPIO3(SCL) –> SCL(SCK)
  GND –> GND

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三、关于I2C(IIC)协议

IIC协议与OLED的使用

四、驱动OLED

1. 安装Adafruit库

   sudo pip3 install adafruit-circuitpython-ssd1306

2. 使用examples

   git clone https://github.com/adafruit/Adafruit_CircuitPython_SSD1306

3. 显示各种信息
   例一、

   import time
   import subprocess
   import datetime
   from board import SCL, SDA
   import busio
   from PIL import Image, ImageDraw, ImageFont
   import adafruit_ssd1306
   i2c = busio.I2C(SCL, SDA)
   disp = adafruit_ssd1306.SSD1306_I2C(128, 64, i2c)
   disp.fill(0)
   disp.show()
   width = disp.width
   height = disp.height
   image = Image.new("1", (width, height))
   draw = ImageDraw.Draw(image)
   draw.rectangle((0, 0, width, height), outline=0, fill=0)
   padding = -2
   top = padding
   bottom = height - padding
   font1 = ImageFont.load_default()
   font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 9)
   font2 = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 14)
   font3 = ImageFont.truetype("/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc", 22)
   while True:
       draw.rectangle((0, 0, width, height), outline=0, fill=0)
       cmd = "hostname -I | cut -d' ' -f1"
       IP = subprocess.check_output(cmd, shell=True).decode("utf-8")
       cmd = "top -bn1 | grep load | awk '{printf \"CPU Load: %.2f\", $(NF-2)}'"
       CPU = subprocess.check_output(cmd, shell=True).decode("utf-8")
       cmd = "free -m | awk 'NR==2{printf \"Mem: %s/%s MB %.2f%%\", $3,$2,$3*100/$2 }'"
       MemUsage = subprocess.check_output(cmd, shell=True).decode("utf-8")
       cmd = 'df -h | awk \'$NF=="/"{printf "Disk: %d/%d GB  %s", $3,$2,$5}\''
       Disk = subprocess.check_output(cmd, shell=True).decode("utf-8")
       draw.text((x, top + 0), "IP: " + IP, font=font, fill=255)
       draw.text((x, top + 8), CPU, font=font, fill=255)
       draw.text((x, top + 16), MemUsage, font=font, fill=255)
       draw.text((x, top + 25), Disk, font=font, fill=255)
   
   #    intro = "Hello!"
   #    draw.text((0, 34), intro, font=font2, fill=255)
   #    draw.text((0, 34), u'黄家星是沙雕', font=font3, fill=255)
       now = datetime.datetime.now()
       today_date = now.strftime("%d %b %y")
       today_time = now.strftime("%H:%M:%S")
       draw.text((x, top + 35), today_date, font=font, fill=255)
       draw.text((x, top + 45), today_time, font=font, fill=255)
       disp.image(image)
       disp.show()
       time.sleep(0.1)

   例二、播放badapple

   import time
   import subprocess
   import datetime
   from board import SCL, SDA
   import busio
   from PIL import Image, ImageDraw, ImageFont
   import adafruit_ssd1306
   i2c = busio.I2C(SCL, SDA)
   
   disp = adafruit_ssd1306.SSD1306_I2C(128, 64, i2c)
   disp.fill(0)
   disp.show()
   
   width = disp.width
   height = disp.height
   image = Image.new("1", (width, height))
   
   draw = ImageDraw.Draw(image)
   
   draw.rectangle((0, 0, width, height), outline=0, fill=0)
   while True:
       for i in range(2,6551):
           disp.show()
           image = Image.open("bad ("+str(i)+").png").convert('1')
           disp.image(image)
   

   资料