MicroPython I2C OLED

源自於
 http://bbs.eeworld.com.cn/thread-508531-1-1.html

NodeMCU 開發板是基於ESP8266 Soc的可以運行MicroPython的開發板,此次使用開發板的I2C功能來驅動OLED顯示。

【1】硬體連接：

ESP8266 I2C對應的引腳為Pin(14)--SCL，Pin(2)--SDA:

【2】程式源碼：

# main.py -- put your code here!

import machine

from machine import Pin,I2C

import ssd1306

import math

import time

# construct an I2C bus

i2c = I2C(scl=Pin(14), sda=Pin(2), freq=100000)

display = ssd1306.SSD1306_I2C(128,64, i2c)

led_blue = machine.Pin(2, Pin.OUT)  # 設置 GPIO2 為輸出

led_blue.high()

try:

  display.poweron()

  display.init_display()

  display.text('PYBNano I2C OLED',1,1)

  display.text('Hi, MicroPython!',1,16)

  display.text('By: hbzjt2012',1,31)

 

  # Write display buffer

  display.show()

  time.sleep(10)

  display.fill(0)

  for x in range(0, 128):

    display.pixel(x, 32+int(math.sin(x/64*math.pi)*7 + 8), 1)

  display.show()

  time.sleep(10)

  display.fill(0)

  x = 0

  y = 0

  direction_x = True

  direction_y = True

  while True:

    # Clear the previous lines

    prev_x = x

    prev_y = y

    # Move bars

    x += (1 if direction_x else -1)

    y += (1 if direction_y else -1)

    # Bounce back, if required

    if x == 128:

       direction_x = False

       x = 126

    elif x == -1:

       direction_x = True

       x = 1

    if y == 64:

       direction_y = False

       y = 63

    elif y == -1:

       direction_y = True

       y = 1

    # Draw new lines

    for i in range(64):

      display.pixel(prev_x, i, False)

      display.pixel(x, i, True)

    for i in range(128):

      display.pixel(i, prev_y, False)

      display.pixel(i, y, True)

    # Make sure the corners are active

    display.pixel(0,   0,  True)

    display.pixel(127, 0,  True)

    display.pixel(0,   63, True)

    display.pixel(127, 63, True)

   

    # Write display buffer

    display.show()

except Exception as ex:

  led_blue.low()

  print('Unexpected error: {0}'.format(ex))

  display.poweroff()