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
- 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。
- 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)。
- 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
- 开启树莓派的SSH服务,并连接到树莓派。
- 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
- 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