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揭秘3.5寸LCD V3.0与树莓派的完美搭配：轻松实现个性化屏幕显示

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在众多开源硬件中，树莓派因其强大的性能和灵活的扩展性而备受喜爱。而3.5寸LCD V3.0作为一款流行的显示屏，与树莓派的搭配使用，可以轻松实现个性化屏幕显示。本文将为您详细介绍如何将3.5寸LCD V3.0与树莓派完美搭配，让您轻松打造属于自己的个性化屏幕显示。

一、3.5寸LCD V3.0简介

3.5寸LCD V3.0是一款高清显示屏，分辨率为320x240像素，支持TFT液晶屏。它具有以下特点：

  • 高清显示：320x240像素，画面清晰细腻
  • 触摸屏功能：支持电阻触摸屏，实现人机交互
  • 轻松连接：通过I2C接口与树莓派连接，无需额外硬件
  • 广泛应用：适用于智能家居、车载导航、工业控制等领域

二、树莓派与3.5寸LCD V3.0连接方法

1. 准备工具

  • 树莓派（建议使用树莓派3或更高版本）
  • 3.5寸LCD V3.0显示屏
  • 电阻触摸屏
  • 连接线（I2C、VCC、GND等）
  • 开发板（可选）

2. 连接步骤

  1. 将3.5寸LCD V3.0显示屏的VCC、GND、SCL、SDA线分别连接到树莓派的VCC、GND、SCL、SDA引脚。
  2. 将电阻触摸屏的VCC、GND、X轴、Y轴分别连接到树莓派的VCC、GND、GPIO引脚（具体连接方式请参考电阻触摸屏说明书）。
  3. 将树莓派与显示屏的电源连接，确保树莓派正常工作。

3. 驱动安装

  1. 开启树莓派的SSH服务，并连接到树莓派。
  2. 输入以下命令安装显示屏驱动：
sudo apt-get install python-smbus
sudo apt-get install python3-smbus
  1. 安装电阻触摸屏驱动：
sudo apt-get install python-smbus
sudo apt-get install python3-smbus

三、个性化屏幕显示实现

1. 显示屏编程

使用Python语言编写代码，实现个性化屏幕显示。以下是一个简单的示例：

”`python import smbus import RPi.GPIO as GPIO import time

初始化I2C总线

bus = smbus.SMBus(1)

设置GPIO引脚

GPIO.setmode(GPIO.BCM) GPIO.setup(18, GPIO.OUT) GPIO.setup(23, GPIO.OUT)

启动显示屏

def lcd_init():

bus.write_byte_data(0x3C, 0x00, 0x00)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x2C)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x2E)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x2F)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x2C)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x27)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x01)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x0C)
time.sleep(0.1)
bus.write_byte_data(0x3C, 0x00, 0x06)
time.sleep(0.1)

清屏

def lcd_clear():

bus.write_byte_data(0x3C, 0x00, 0x01)

显示字符串

def lcd_print(text, row, col):

lcd_set_cursor(row, col)
for char in text:
    lcd_char(char)

设置光标位置

def lcd_set_cursor(row, col):

col = col * 0x40
row = row * 0x40
address = 0x80 | col | row
bus.write_byte_data(0x3C, 0x00, address)

显示字符

def lcd_char(char):

char_data = char
if char >= 0x20 and char <= 0x7E:
    char_data = font[char - 0x20]
bus.write_byte_data(0x3C, 0x40, char_data)

字体数据（ASCII码0x20-0x7E）

font = [

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x18, 0x3C, 0x7E, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18
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