NodeMCU and 1602I2C(1)

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今天更新了一下代码，实现了两行显示，第一行显示CPU Load，第二行显示剩余内存数。

只是部分替代数据显示部分，这个代码还是有BUG的，譬如说最后一位在下一次显示时不会被清零。

import psutil
import serial
import time


# Setup the Serial Port and open it. 
ser = serial.Serial()
ser.baudrate = 9600
ser.port = '/dev/ttyUSB0'
ser.open()
## Todo, to check if the port is opened.

# Really talks to the i2c LCD.

# Setup the wiring
ser.write(b'i2c.setup(0, 4, 3, i2c.SLOW)\r\n')

# dofile, load the lcd library
ser.write(b'lcd = dofile("lcd1602.lua")()\r\n')

# Now Refresh the LCD. 
ser.write(b'lcd.clear()\r\n')
#ser.write(b'lcd.put(lcd.light(on))\r\n')
ser.write(b'lcd.put(lcd.locate(0, 0), "CPU Load: ")\r\n')
ser.write(b'lcd.put(lcd.locate(1, 0), "Mem Free: ")\r\n')
ser.write(b'lcd.put(lcd.locate(0, 14), "%")\r\n')
ser.write(b'lcd.put(lcd.locate(1, 14), "MB")\r\n')

# Fetching the percentage per 1 second
# Todo, change the while true into CTRL+C stopped. 
while True:
    # Get current percentage
    #ser.write(b'lcd.clear()\r\n')
    currentPer = str(psutil.cpu_percent()).encode('ascii')
    memFree = str(int(psutil.virtual_memory().free/1024/1024)).encode('ascii')
    oneLine = b'lcd.put(lcd.locate(0, 9), "' + currentPer + b'")\r\n'
    SecondLine = b'lcd.put(lcd.locate(1, 9), "' + memFree + b'")\r\n'
    # Format oneLine
    #ser.write(b'lcd.put(lcd.locate(0, 0), "CPU Load: ")\r\n')
    #ser.write(b'lcd.put(lcd.locate(1, 0), "Mem Free: ")\r\n')
    #ser.write(b'lcd.put(lcd.locate(0, 14), "%")\r\n')
    #ser.write(b'lcd.put(lcd.locate(1, 14), "MB")\r\n')
    #time.sleep(0.2)
    ser.write(oneLine)
    time.sleep(0.2)
    ser.write(SecondLine)
    time.sleep(1)