树莓派+OLCD 12864液晶屏+SSD1306芯片驱动(20

OLED 128*64小屏（为 SSD1306 芯片驱动）

O1CN01DQO4Ye1mnaXP3CATb_!!2206918794999.jpg

【一、启用树莓派的I2C功能】
更新库命令： sudo apt-get install -y python-imaging python-smbus i2c-tools
开启I2C命令： sudo raspi-config
设置开启 I2C 功能

微信截图_20200909170101.png
开启后，重启树莓派
命令：sudo reboot

【二、连接屏幕】
屏幕 GND 接 树莓派 GND
屏幕 VCC 接 树莓派 5V
屏幕 SDA 接 树莓派 SDA 在 IIC 通信中为数据管脚
屏幕 SCL 接 树莓派 SCL 在 IIC 通信中为时钟管脚
注意一定不要接反 VCC 和 GND，否则会烧坏屏幕。

下面通过命令检测是否识别到 I2C 设备。
命令： sudo i2cdetect -y 1

3c.png

将显示已连接设备的 I2C 地址，不同的屏幕地址可能会不一样，通过这个步骤可以确认一下。

【三 、克隆库】

git clone https://github.com/adafruit/Adafruit_Python_SSD1306.git
cd Adafruit_Python_SSD1306
sudo python setup.py install

sudo pip install Adafruit-BBIO

【四、运行测试】

cd examples/
sudo python stats.py

image.png

【五、简单代码演示】

import time

import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont

# Raspberry Pi pin configuration:
RST = None     # on the PiOLED this pin isnt used

# 128x64 display with hardware I2C:
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST)

# Initialize library.
disp.begin()

# Clear display.
disp.clear()
disp.display()

# Make sure to create image with mode '1' for 1-bit color.
width = disp.width #128
height = disp.height #64
image = Image.new('1', (width, height))

# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)

#定义Y位置，也就是哪一行
y = -2

# 设置默认字体
font = ImageFont.load_default()
# 也可以输入指定位置的字体文件和字体大小
font16 = ImageFont.truetype('/usr/share/fonts/truetype/ttf-bitstream-vera/VeraBd.ttf', 16)

#程序循环开始
while True:
    # Draw a black filled box to clear the image.
    draw.rectangle((0,0,width,height), outline=0, fill=0)

    my_date=time.strftime("%Y-%m-%d",time.localtime()) #2020-09-23
    my_time=time.strftime("%H:%M:%S",time.localtime()) #13:15:03
    
    # Write two lines of text.
    draw.text((28, y),    my_time ,  font=font16, fill=255)
    draw.text((16, y+16), my_date ,  font=font16, fill=255)
    draw.text(( 0, y+32), "ABCDEFGHIJKLMNOPQRSTUVWXYZ" ,  font=font, fill=255)
    draw.text(( 0, y+40), "abcdefghijklmnopqrstuvwxyz" ,  font=font, fill=255)
    draw.text(( 0, y+56), "1234567890 1234567890 1234567890" ,  font=font, fill=255)

    # 画多个点：[(点1x,点1y)，(点2x，点2y)]
    draw.point([(1,1),(2,2), (3, 3)],fill=255)
    # 画线： 起点x,起点y,终点x,终点y
    draw.line((0, 0, 50, 20), fill=255)
    # 画椭圆： 左上角x,左上角y, 右下角x,右下角y
    draw.ellipse((1, 1 , 50, 30), outline=255, fill=0)
    # 画长方形： 左上角x,左上角y, 右下角x,右下角y
    draw.rectangle((10, 10, 40, 20), outline=255, fill=0)
    # 画三角形：:角1x,y,角2x,y,角3x,y
    draw.polygon([(0, 0), (0, 40), (30, 40)], outline=255, fill=0)
    
# Display image.
    disp.image(image)
    disp.display()
    time.sleep(0.2)

我的液晶屏本身就是上黄下蓝，不是程序设置的。

image.png

【例子：用DHT11温湿度传感器获取温度湿度，显示在液晶屏上】

import RPi.GPIO as GPIO
import time

import Adafruit_GPIO.SPI as SPI
import Adafruit_SSD1306

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import dht11

# initialize GPIO
GPIO.setmode(GPIO.BCM)
#指定BCM 引脚编号 Pin 18
instance = dht11.DHT11(pin=18)
#read
#result = instance.read()


# Raspberry Pi pin configuration:
RST = None     # on the PiOLED this pin isnt used
# 128x64 display with hardware I2C:
disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST)
# Initialize library.
disp.begin()
# Clear display.
disp.clear()
disp.display()
# Make sure to create image with mode '1' for 1-bit color.
width = disp.width #128
height = disp.height #64
image = Image.new('1', (width, height))
# Get drawing object to draw on image.
draw = ImageDraw.Draw(image)


# Load default font.
font = ImageFont.load_default()
font16 = ImageFont.truetype('/usr/share/fonts/truetype/ttf-bitstream-vera/VeraBd.ttf', 16)

x = 0  # X坐标
y = 0  # Y坐标
i = 11  # 因为温度获取太频繁了，就会显示0度0湿度，所以设置每显示10次，才获取1次，防止出现00
while True:
    # Draw a black filled box to clear the image.
    draw.rectangle((0,0,width,height), outline=0, fill=0)

    my_date=time.strftime("%Y-%m-%d",time.localtime()) #2020-09-23
    my_time=time.strftime("%H:%M:%S",time.localtime()) #13:15:03
    
    # Write two lines of text.
    draw.text((28, y),    my_time ,  font=font16, fill=255)
    draw.text((16, y+20), my_date ,  font=font16, fill=255)
    #draw.text(( 0, y+32), "ABCDEFGHIJKLMNOPQRSTUVWXYZ" ,  font=font, fill=255)
    #draw.text(( 0, y+40), "abcdefghijklmnopqrstuvwxyz" ,  font=font, fill=255)
    #draw.text(( 0, y+56), "1234567890 1234567890 1234567890" ,  font=font, fill=255)

    # 画椭圆： 左上角x,左上角y,宽，高
    #draw.ellipse((30, 30 , 80, 60), outline=255, fill=0)
    # 画长方形： 左上角x,左上角y,宽，高
    #draw.rectangle((15, 15, 65, 45), outline=255, fill=0)
    # 画多个点：[(点1x,点1y)，(点2x，点2y)]
    #draw.point([(1,1),(2,2), (3, 3)],fill=255)
    # 画线： 起点x,起点y,终点x,终点y
    #draw.line((0, 0, 50, 20), fill=255)
    # 画三角形：:角1x,y,角2x,y,角3x,y
    #draw.polygon([(40, 15), (30, 40), (50, 40)], outline=255, fill=0)

    # 每显示10次获取一次湿度和温度，防止太频繁变成00
    if i>=10:    
        result = instance.read()
        i=1
    else :
        i=i+1
        
    draw.text((8, 45),    "T:"+str(result.temperature)+"C" ,  font=font16, fill=255)
    draw.text((70, 45),   "H:"+str(result.humidity)+"%" ,     font=font16, fill=255)
    
    # 画线： 起点x,起点y,终点x,终点y  画几条装饰线
    draw.line((0, 18, 128, 18), fill=255)
    draw.line((0, 40, 128, 40), fill=255)
    draw.line((64, 40, 64, 64), fill=255)
    draw.ellipse((46, 47 , 48, 49), outline=255, fill=0)  　　 #画温度符号上的小圆点

    # Display image.
    disp.image(image)
    disp.display()
    time.sleep(1)

image.png