BakeBit - OLED 128x64/zh

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1 介绍

OLED
  • BakeBit - OLED是一个0.96寸OLED模块,使用了一片128x64分辨率的单色OLED屏幕,OLED具有亮度高、对比度高、自发光、视角宽、功耗低等特点。模块使用了I2C接口,使用方便快捷。
  • 通过配置模块上的地址设置电阻,可设置模块I2C从地址为0X3C或0X3D,这样同一个I2C总线上可同时连接两个OLED模块。

2 特性

  • 使用标准的2.0mm 4 Pin BakeBit I2C接口
  • 128x64分辨率
  • 颜色:蓝色
  • 模块I2C地址可配置。
  • PCB尺寸(mm):24x42

BakeBit - OLED_Top BakeBit - OLED_Bottom

  • 引脚说明:
名称 描述
GND
5V 电源5V
SDA I2C-SDA
SCL I2C-SCL

3 示例程序(1):Display System Info

这个例子我们使用显示屏来显示系统信息,例如IP地址,存储空间和内存信息,CPU当前频率等。

3.1 硬件连接

简单的将 OLED 模块插入随便一个 I2C 接口,如下面这样:

OLED-1.jpg OLED-2.jpg

3.2 示例源代码

import time
import bakebit
import os
import psutil
from math import log
import multiprocessing
import platform
import socket
import bakebit_128_64_oled as oled
 
oled.init()                  #initialze SEEED OLED display
oled.clearDisplay()          #clear the screen and set start position to top left corner
oled.setNormalDisplay()      #Set display to normal mode (i.e non-inverse mode)
oled.setPageMode()           #Set addressing mode to Page Mode
 
byteunits = ('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB')
def filesizeformat(value):
    exponent = int(log(value, 1024))
    return "%.1f %s" % (float(value) / pow(1024, exponent), byteunits[exponent])
 
memUsage = psutil.phymem_usage()
diskUsage = psutil.disk_usage('/')
 
oled.setTextXY(0,0)
oled.putString("%s" % socket.gethostbyname(socket.gethostname()))
 
oled.setTextXY(0,1)
oled.putString("Mem:%s" % filesizeformat(memUsage.total))
 
oled.setTextXY(0,2)
oled.putString("Usage:%d%%" % memUsage.percent)
 
oled.setTextXY(0,3)
oled.putString("Disk:%s" % filesizeformat(diskUsage.total))
 
oled.setTextXY(0,4)
oled.putString("Usage:%d%%" % diskUsage.percent)
 
oled.setTextXY(0,5)
oled.putString("CPU:%s" % platform.processor())
 
oled.setTextXY(0,6)
oled.putString("Cores:%d" % multiprocessing.cpu_count())
 
with open("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq") as f:
	freq = int(f.readlines()[0])/1000
	freqStr = "%d MHz" % freq
	if freq > 1000:
		freqStr = "%.1f GHz" % (float(freq)/1000.0)
	oled.setTextXY(0,7)
	oled.putString("Freq:%s" % freqStr)
oled.setTextXY(0,2)
oled.putString("Usage:%d%%" % memUsage.percent)
 
oled.setTextXY(0,3)
oled.putString("Disk:%s" % filesizeformat(diskUsage.total))
 
oled.setTextXY(0,4)
oled.putString("Usage:%d%%" % diskUsage.percent)
 
oled.setTextXY(0,5)
oled.putString("CPU:%s" % platform.processor())
 
oled.setTextXY(0,6)
oled.putString("Cores:%d" % multiprocessing.cpu_count())
 
with open("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq") as f:
	freq = int(f.readlines()[0])/1000
	freqStr = "%d MHz" % freq
	if freq > 1000:
		freqStr = "%.1f GHz" % (float(freq)/1000.0)
	oled.setTextXY(0,7)
	oled.putString("Freq:%s" % freqStr)

Github

3.3 运行示例

假设你已经参考bakebit教程安装了BakeBit源代码,
要运行示例程序,可以在开发板上进入 BakeBit/Software/Python目录,运行bakebit_prj_SystemInfo.py:

cd ~/BakeBit/Software/Python
sudo python bakebit_prj_SystemInfo.py

3.4 运行结果

效果如下图所示:
OLED-SystemInfo.jpg

4 示例程序(2):UI Control via Joystick

该示例是配合BakeBit - JoyStick来实现的,可参考BakeBit - JoyStick页面。

5 相关资料