树莓派 1602A显示屏[通俗易懂]

树莓派 1602A显示屏[通俗易懂]树莓派1602A显示屏下面代码本人测试过没有问题,开始运行完屏幕上什么也没有显示出来,后来调整了下电位器可以了,所以大家如果按着下面的做出来之后运行什么也没有显示的话,记得调整下电位器[img]http://dl2.iteye.com/upload/attachment/0128/7783/cefa073e-97ee-3d45-bddf-d7a878c232a1.png[/img…

大家好,又见面了,我是你们的朋友全栈君。如果您正在找激活码,请点击查看最新教程,关注关注公众号 “全栈程序员社区” 获取激活教程,可能之前旧版本教程已经失效.最新Idea2022.1教程亲测有效,一键激活。

Jetbrains全系列IDE使用 1年只要46元 售后保障 童叟无欺
树莓派 1602A显示屏

下面代码本人测试过没有问题,开始运行完屏幕上什么也没有显示出来,后来调整了下电位器可以了,所以大家如果按着下面的做出来之后运行什么也没有显示的话,记得调整下电位器

[img]http://dl2.iteye.com/upload/attachment/0128/7783/cefa073e-97ee-3d45-bddf-d7a878c232a1.png[/img]

LCD1602接线说明

VSS,接地

VDD,接5V电源

VO,液晶对比度调节,接电位器中间的引脚,电位器两边的引脚分别接5V和接地。

RS,寄存器选择,接GPIO14

RW,读写选择,接地,表示写模式

EN,使能信号,接GPIO15

D0,数据位0,4位工作模式下不用,不接

D1,数据位1,4位工作模式下不用,不接

D2,数据位2,4位工作模式下不用,不接

D3,数据位3,4位工作模式下不用,不接

D4,数据位4,接GPIO17

D5,数据位5,接GPIO18

D6,数据位6,接GPIO27

D7,数据位7,接GPIO22

A,液晶屏背光+,接5V

K,液晶屏背光-,接地

一共就两个文件

lcd1602.py


#!/usr/bin/python

#
# based on code from lrvick and LiquidCrystal
# lrvic - https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py
# LiquidCrystal - https://github.com/arduino/Arduino/blob/master/libraries/LiquidCrystal/LiquidCrystal.cpp
#

from time import sleep

class lcd1602:

# commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80

# flags for display entry mode
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00

# flags for display on/off control
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00

# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00

# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00

# flags for function set
LCD_8BITMODE = 0x10
LCD_4BITMODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10DOTS = 0x04
LCD_5x8DOTS = 0x00



def __init__(self, pin_rs=14, pin_e=15, pins_db=[17, 18, 27, 22], GPIO = None):
# Emulate the old behavior of using RPi.GPIO if we haven't been given
# an explicit GPIO interface to use
if not GPIO:
import RPi.GPIO as GPIO
self.GPIO = GPIO
self.pin_rs = pin_rs
self.pin_e = pin_e
self.pins_db = pins_db

self.GPIO.setmode(GPIO.BCM)
self.GPIO.setwarnings(False)
self.GPIO.setup(self.pin_e, GPIO.OUT)
self.GPIO.setup(self.pin_rs, GPIO.OUT)

for pin in self.pins_db:
self.GPIO.setup(pin, GPIO.OUT)

self.write4bits(0x33) # initialization
self.write4bits(0x32) # initialization
self.write4bits(0x28) # 2 line 5x7 matrix
self.write4bits(0x0C) # turn cursor off 0x0E to enable cursor
self.write4bits(0x06) # shift cursor right

self.displaycontrol = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF

self.displayfunction = self.LCD_4BITMODE | self.LCD_1LINE | self.LCD_5x8DOTS
self.displayfunction |= self.LCD_2LINE

""" Initialize to default text direction (for romance languages) """
self.displaymode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) # set the entry mode

self.clear()


def begin(self, cols, lines):

if (lines > 1):
self.numlines = lines
self.displayfunction |= self.LCD_2LINE
self.currline = 0


def home(self):

self.write4bits(self.LCD_RETURNHOME) # set cursor position to zero
self.delayMicroseconds(3000) # this command takes a long time!


def clear(self):

self.write4bits(self.LCD_CLEARDISPLAY) # command to clear display
self.delayMicroseconds(3000) # 3000 microsecond sleep, clearing the display takes a long time


def setCursor(self, col, row):

self.row_offsets = [ 0x00, 0x40, 0x14, 0x54 ]

if ( row > self.numlines ):
row = self.numlines - 1 # we count rows starting w/0

self.write4bits(self.LCD_SETDDRAMADDR | (col + self.row_offsets[row]))


def noDisplay(self):
""" Turn the display off (quickly) """

self.displaycontrol &= ~self.LCD_DISPLAYON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)


def display(self):
""" Turn the display on (quickly) """

self.displaycontrol |= self.LCD_DISPLAYON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)


def noCursor(self):
""" Turns the underline cursor on/off """

self.displaycontrol &= ~self.LCD_CURSORON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)


def cursor(self):
""" Cursor On """

self.displaycontrol |= self.LCD_CURSORON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)


def noBlink(self):
""" Turn on and off the blinking cursor """

self.displaycontrol &= ~self.LCD_BLINKON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)


def noBlink(self):
""" Turn on and off the blinking cursor """

self.displaycontrol &= ~self.LCD_BLINKON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)


def DisplayLeft(self):
""" These commands scroll the display without changing the RAM """

self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVELEFT)


def scrollDisplayRight(self):
""" These commands scroll the display without changing the RAM """

self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVERIGHT);


def leftToRight(self):
""" This is for text that flows Left to Right """

self.displaymode |= self.LCD_ENTRYLEFT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode);


def rightToLeft(self):
""" This is for text that flows Right to Left """
self.displaymode &= ~self.LCD_ENTRYLEFT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)


def autoscroll(self):
""" This will 'right justify' text from the cursor """

self.displaymode |= self.LCD_ENTRYSHIFTINCREMENT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)


def noAutoscroll(self):
""" This will 'left justify' text from the cursor """

self.displaymode &= ~self.LCD_ENTRYSHIFTINCREMENT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)


def write4bits(self, bits, char_mode=False):
""" Send command to LCD """

self.delayMicroseconds(1000) # 1000 microsecond sleep

bits=bin(bits)[2:].zfill(8)

self.GPIO.output(self.pin_rs, char_mode)

for pin in self.pins_db:
self.GPIO.output(pin, False)

for i in range(4):
if bits[i] == "1":
self.GPIO.output(self.pins_db[::-1][i], True)

self.pulseEnable()

for pin in self.pins_db:
self.GPIO.output(pin, False)

for i in range(4,8):
if bits[i] == "1":
self.GPIO.output(self.pins_db[::-1][i-4], True)

self.pulseEnable()


def delayMicroseconds(self, microseconds):
seconds = microseconds / float(1000000) # divide microseconds by 1 million for seconds
sleep(seconds)


def pulseEnable(self):
self.GPIO.output(self.pin_e, False)
self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns
self.GPIO.output(self.pin_e, True)
self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns
self.GPIO.output(self.pin_e, False)
self.delayMicroseconds(1) # commands need > 37us to settle


def message(self, text):
""" Send string to LCD. Newline wraps to second line"""

for char in text:
if char == '\n':
self.write4bits(0xC0) # next line
else:
self.write4bits(ord(char),True)


if __name__ == '__main__':

lcd = lcd1602()
lcd.clear()
lcd.message("hello world!")

1602.py


#!/usr/bin/python

from lcd1602 import *
from datetime import *
import commands

def get_cpu_temp():
tmp = open('/sys/class/thermal/thermal_zone0/temp')
cpu = tmp.read()
tmp.close()
return '{:.2f}'.format( float(cpu)/1000 ) + ' C'

def get_gpu_temp():
tmp = commands.getoutput('vcgencmd measure_temp|awk -F= \'{print $2}\'').replace('\'C','')
gpu = float(tmp)
return '{:.2f}'.format( gpu ) + ' C'

def get_time_now():
return datetime.now().strftime(' %H:%M:%S\n %Y-%m-%d')

def get_ip_info():
return commands.getoutput('ifconfig wlan0|grep inet|awk -Faddr: \'{print $2}\'|awk \'{print $1}\'')

def get_mem_info():
total= commands.getoutput('free -m|grep Mem:|awk \'{print $2}\'')
free = commands.getoutput('free -m|grep cache:|awk \'{print $4}\'')
return 'MEM:\n ' + free +' / '+ total +' M'

lcd = lcd1602()
lcd.clear()

if __name__ == '__main__':

while(1):
lcd.clear()
lcd.message( get_ip_info() )
sleep(5)

lcd.clear()
lcd.message( get_time_now() )
sleep(5)

lcd.clear()
lcd.message( get_mem_info() )
sleep(5)

lcd.clear()
lcd.message( 'CPU: ' + get_cpu_temp()+'\n' )
lcd.message( 'GPU: ' + get_gpu_temp() )
sleep(5)

将以上两个文件保存在同一个目录下,运行1602.py即可打印信息到LCD上。

自己看看代码就会用了

版权声明:本文内容由互联网用户自发贡献,该文观点仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 举报,一经查实,本站将立刻删除。

发布者:全栈程序员-用户IM,转载请注明出处:https://javaforall.cn/190718.html原文链接:https://javaforall.cn

【正版授权,激活自己账号】: Jetbrains全家桶Ide使用,1年售后保障,每天仅需1毛

【官方授权 正版激活】: 官方授权 正版激活 支持Jetbrains家族下所有IDE 使用个人JB账号...

(0)


相关推荐

  • oracle srvctl命令,Oracle SRVCTL使用说明

    oracle srvctl命令,Oracle SRVCTL使用说明SRVCTL是Oracle9iRAC集群配置管理的工具。本文是对SRVCTL的所有命令进行详细说明的一篇参考文档。添加数据库或实例的配置信息。在增加实例中,与-i一起指定的名字应该与INSTANCE_NAME和ORACLE_SID参数匹配。srvctladddatabase-ddatabase_name[-mdomain_name]-ooracle_home[-sspfi…

  • 什么是代码_大专程序员有人要吗

    什么是代码_大专程序员有人要吗什么是代码,什么是数据。代码是能够处理其他数据的数据,而数据是储存信息的数据。数据有时能够变成代码,代码也可以变成数据。甚至,一段数据中某一段,都可以单独拿出来,通过执行器执行(执行器,比如exe的执

  • pycharm用anaconda的Python_pycharm配置anaconda环境

    pycharm用anaconda的Python_pycharm配置anaconda环境先附上链接两个,是我自己用的pycharm链接:https://pan.baidu.com/s/1O5PixlPNpUw3RcxYbHHdBQ密码:vgjy下面是我自己用的Anaconda,版本是Anaconda2-5.0.1-Windows-x86_64链接:https://pan.baidu.com/s/16jiiYDtH9pVZTz6Ix7FeIQ密码:0yzmAnaco…

  • clion激活码(破解版激活)[通俗易懂]

    clion激活码(破解版激活),https://javaforall.cn/100143.html。详细ieda激活码不妨到全栈程序员必看教程网一起来了解一下吧!

  • 【编解码】从零开始写H264解码器(1) 总纲

    【编解码】从零开始写H264解码器(1) 总纲关于编解码的原理的书和文章自己一直在看,从入门到略懂,但是感觉有些零零碎碎,或不完整,似乎串不成体系。有些小功能,知道是知道,并不知道它的意义和作用,时间一长也会慢慢忘记。反思了一下,或许很多东西,还是需要自己动手做一遍,会理解的更深更透彻一些,就像费曼学习法,你能讲出来,才说明懂了,这个也一样,你能把功能实现出来,才说明你真的明白了里面的流程和逻辑。

  • 如何删除sqlserver实例_sql server删除表

    如何删除sqlserver实例_sql server删除表在网上找到下面几种方法,本人使用的是第一种,很实用。1.删除SQLServer的特定实例若要删除SQLServer的某个特定实例,请按照以下步骤操作:找到并删除%drive%:\\ProgramFiles\\MicrosoftSQLServer\\MSSQL\\Binn文件夹,其中%drive%是要删除的SQLServer实例的位置。找到以下注册表项:HKEY…

发表回复

您的电子邮箱地址不会被公开。

关注全栈程序员社区公众号