add(i2c): i2c python

i2c.py/readme.md

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+## i2c python3 
+
+1. 必须安装
+```shell
+apt install -y fonts-wqy-microhei fonts-wqy-zenhei
+apt install -y i2c-tools libgpiod-dev
+apt install -y python3-pip python3-pil python3-libgpiod
+pip3 install adafruit-circuitpython-ssd13060 --break-system-packages
+```
+2. 调试
+
+```shell
+python3 ./status.py
+```
+3. rc-local
+
+```shell
+vim /etc/rc.local
+# 在 exit 0 之前添加
+python3 /home/yong/i2c.py/status.py &
+```
+
+

i2c.py/status.py

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+# This example is for use on (Linux) computers that are using CPython with
+# Adafruit Blinka to support CircuitPython libraries. CircuitPython does
+# not support PIL/pillow (python imaging library)!
+
+import time
+import subprocess
+
+from board import SCL, SDA
+import busio
+from PIL import Image, ImageDraw, ImageFont
+import adafruit_ssd1306
+
+
+# Create the I2C interface.
+i2c = busio.I2C(SCL, SDA)
+
+# Create the SSD1306 OLED class.
+# The first two parameters are the pixel width and pixel height.  Change these
+# to the right size for your display!
+disp = adafruit_ssd1306.SSD1306_I2C(128, 64, i2c)
+
+# Clear display.
+disp.fill(0)
+disp.show()
+
+# 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('/usr/share/fonts/truetype/wqy/wqy-microhei.ttc', 11)
+
+while True:
+    # 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).decode("utf-8")
+    cmd = 'cut -f 1 -d " " /proc/loadavg'
+    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=="/data"{printf "Disk: %d/%d GB  %s", $3,$2,$5}\''
+    Disk = subprocess.check_output(cmd, shell=True).decode("utf-8")
+
+    date_time = time.strftime("%Y-%m-%d, %H:%M:%S")
+    # Write four lines of text.
+
+    draw.text((x, top + 1), "IP: " + IP, font=font, fill=255)
+    draw.text((x, top + 13), "CPU: " + CPU, font=font, fill=255)
+    draw.text((x, top + 23), MemUsage, font=font, fill=255)
+    draw.text((x, top + 35), Disk, font=font, fill=255)
+    draw.text((x, top + 47), date_time, font=font, fill=255)
+
+    # Display image.
+    disp.image(image)
+    disp.show()
+    time.sleep(0.1)