树莓派3B使用LCD1602打造数字日历
下面介绍在树莓派3B上使用LCD1602液晶屏打造数字日历的方法树莓派3B的GPIO排针定义如下
https://github.com/yfgeek/rpi-TempRuntime/raw/master/images/2.png
LCD1602使用I2C连接方式连接到树莓派3B，SDA SCL VCC GND分布连接到树莓派3B的Pin3 Pin5 Pin3 Pin6
然后给树莓派3B上电，输入下面命令安装所需组件sudo apt-get install i2c-tools python-smbus
然后使用查看I2C设备是否显示ls /dev
可知没有发现I2C设备，但是硬件连接又正确，原因是Raspbian固件默认关闭了I2C接口，输入下面命令sudo raspi-config按下面选择打开I2C接口
再次查看i2c设备ls /dev可以看到i2c-1设备了
查看地址码i2cdetect -y 1可知为3f
创建一个python脚本lcd-clock.pyvi lcd-clock.py加入下面代码import smbus
import time
import os
from time import gmtime, strftime, localtime
os.environ['TZ'] = 'Asia/Shanghai'
time.tzset()
bus = smbus.SMBus(1)
addr = 0x3f
def writeCommand(command):
bus.write_byte(addr, 0b1100 | command << 4)
time.sleep(0.005)
bus.write_byte(addr, 0b1000 | command << 4)
time.sleep(0.005)
def writeWord(word):
for i in range(0,len(word)):
asciiCode =ord(word)
bus.write_byte(addr, 0b1101 |(asciiCode >> 4 & 0x0F) << 4)
time.sleep(0.0005)
bus.write_byte(addr, 0b1001 |(asciiCode >> 4 & 0x0F) << 4)
time.sleep(0.0005)
bus.write_byte(addr, 0b1101 |(asciiCode & 0x0F) << 4)
time.sleep(0.0005)
bus.write_byte(addr, 0b1001 | (asciiCode & 0x0F) << 4)
time.sleep(0.0005)
# init
writeCommand(0b0010)
# 4-byte mode, 2 line code
writeCommand(0b0010)
writeCommand(0b1111)
# set cursor mode
writeCommand(0b0000)
writeCommand(0b1100)
# cursor shift mode
writeCommand(0b0000)
writeCommand(0b0110)
writeWord("Welcome")
clear = True
time.sleep(1)
while(1):
# first line first column
writeCommand(0b1000)
writeCommand(0b0000)
writeWord(strftime("%Y-%m-%d, %a ", localtime()))
# second line first column
writeCommand(0b1100)
writeCommand(0b0000)
writeWord(strftime("%H:%M:%S", localtime()))
time.sleep(0.2)
保存后运行sudo python lcd-clock.py
数字日历效果如下
噗噗熊 发表于 2017-12-20 09:49 static/image/common/back.gif
可乐早上好，顶！
早上好 噗噗熊 可乐早上好，顶！
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