【BPI-M2 Zero试用】LCD1602网络校时数字日历时钟

可乐丸子

下面介绍使用BPI-M2 Zero连接LCD1602(I2C）打造网络自动对时的数字日历时钟的方法
首先将BPI-M2 Zero开发板的SDA SCL连接到I2C接口的LCD1602的SDA SCL（下图的PIN3 PIN5），然后将LCD1602的VCC GND连接开发板的PIN2 PIN6

从上图可知开发板的上面接口为I2C1，但是实际测试在ARMBIAN中显示为I2C0，安装如下组件

1. sudo apt-get install i2c-tools python-smbus

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输入下面命令打开I2C-0

1. sudo armbian-config

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保存后重启，然后输入下面命令查看I2C地址

创建python脚本lcd-clock.py，输入下面代码

1. import smbus
   
2. import time
   
3. import os
   
4. from time import gmtime, strftime, localtime
   
5. 
   
6. os.environ['TZ'] = 'Asia/Shanghai'
   
7. time.tzset()
   
8. 
   
9. bus = smbus.SMBus(0)
   
10. addr = 0x3f
    
11. 
    
12. def writeCommand(command):
    
13.    bus.write_byte(addr, 0b1100 | command << 4)
    
14.    time.sleep(0.005)
    
15.    bus.write_byte(addr, 0b1000 | command << 4)
    
16.    time.sleep(0.005)
    
17. 
    
18. def writeWord(word):
    
19.    for i in range(0,len(word)):
    
20.       asciiCode =  ord(word[i])
    
21.       bus.write_byte(addr, 0b1101 |(asciiCode >> 4 & 0x0F) << 4)
    
22.       time.sleep(0.0005)
    
23.       bus.write_byte(addr, 0b1001 |(asciiCode >> 4 & 0x0F) << 4)
    
24.       time.sleep(0.0005)
    
25.       bus.write_byte(addr, 0b1101 |(asciiCode & 0x0F) << 4)
    
26.       time.sleep(0.0005)
    
27.       bus.write_byte(addr, 0b1001 | (asciiCode & 0x0F) << 4)
    
28.       time.sleep(0.0005)
    
29. 
    
30. # init
    
31. writeCommand(0b0010)
    
32. 
    
33. # 4-byte mode, 2 line code
    
34. writeCommand(0b0010)
    
35. writeCommand(0b1111)
    
36. 
    
37. # set cursor mode
    
38. writeCommand(0b0000)
    
39. writeCommand(0b1100)
    
40. 
    
41. # cursor shift mode
    
42. writeCommand(0b0000)
    
43. writeCommand(0b0110)
    
44. 
    
45. writeWord("Welcome")
    
46. clear = True
    
47. time.sleep(1)
    
48. 
    
49. while(1):
    
50.    # first line first column
    
51.    writeCommand(0b1000)
    
52.    writeCommand(0b0000)
    
53.    writeWord(strftime("%Y-%m-%d, %a ", localtime()))
    
54. 
    
55.    # second line first column
    
56.    writeCommand(0b1100)
    
57.    writeCommand(0b0000)
    
58.    writeWord(strftime("%H:%M:%S", localtime()))
    
59.    time.sleep(0.2)

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运行

1. sudo python lcd-clock.py

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显示效果如下