用树莓派的python语言控制LCD1602
时间: 2024-03-26 15:34:17 浏览: 210
好的,控制 LCD1602 的基本步骤如下:
1. 确定树莓派 GPIO 引脚:根据你所使用的树莓派型号和引脚定义,选择合适的 GPIO 引脚。可以在树莓派官网上找到对应的引脚定义。
2. 安装 RPi.GPIO 库:在你的树莓派上安装 RPi.GPIO 库,可以使用 pip 命令进行安装。
3. 连接硬件:连接 LCD1602 到你的树莓派上,确保连接正确。
4. 编写代码:在 Python 的开发环境中编写代码,使用 RPi.GPIO 库进行 GPIO 引脚的定义和初始化,使用库文件进行 LCD1602 的控制。
下面是一个简单的控制 LCD1602 的示例代码:
```python
import RPi.GPIO as GPIO
import time
# Define GPIO pins for LCD
LCD_RS = 26
LCD_E = 19
LCD_D4 = 13
LCD_D5 = 6
LCD_D6 = 5
LCD_D7 = 11
# Define some device constants
LCD_WIDTH = 16 # Maximum characters per line
LCD_CHR = True
LCD_CMD = False
LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line
LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line
E_PULSE = 0.0005
E_DELAY = 0.0005
def lcd_init():
GPIO.setmode(GPIO.BCM)
GPIO.setup(LCD_E, GPIO.OUT)
GPIO.setup(LCD_RS, GPIO.OUT)
GPIO.setup(LCD_D4, GPIO.OUT)
GPIO.setup(LCD_D5, GPIO.OUT)
GPIO.setup(LCD_D6, GPIO.OUT)
GPIO.setup(LCD_D7, GPIO.OUT)
lcd_byte(0x33,LCD_CMD) # 110011 Initialize
lcd_byte(0x32,LCD_CMD) # 110010 Initialize
lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction
lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off
lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size
lcd_byte(0x01,LCD_CMD) # 000001 Clear display
time.sleep(E_DELAY)
def lcd_byte(bits, mode):
GPIO.output(LCD_RS, mode)
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x10==0x10:
GPIO.output(LCD_D4, True)
if bits&0x20==0x20:
GPIO.output(LCD_D5, True)
if bits&0x40==0x40:
GPIO.output(LCD_D6, True)
if bits&0x80==0x80:
GPIO.output(LCD_D7, True)
lcd_toggle_enable()
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x01==0x01:
GPIO.output(LCD_D4, True)
if bits&0x02==0x02:
GPIO.output(LCD_D5, True)
if bits&0x04==0x04:
GPIO.output(LCD_D6, True)
if bits&0x08==0x08:
GPIO.output(LCD_D7, True)
lcd_toggle_enable()
def lcd_toggle_enable():
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
def lcd_string(message, line):
message = message.ljust(LCD_WIDTH," ")
lcd_byte(line, LCD_CMD)
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
if __name__ == '__main__':
try:
lcd_init()
lcd_string("Hello, world!", LCD_LINE_1)
lcd_string("From Raspberry Pi", LCD_LINE_2)
time.sleep(3)
lcd_byte(0x01, LCD_CMD)
time.sleep(3)
lcd_string("Goodbye!", LCD_LINE_1)
lcd_string("See you later.", LCD_LINE_2)
time.sleep(3)
lcd_byte(0x01, LCD_CMD)
GPIO.cleanup()
except KeyboardInterrupt:
pass
finally:
GPIO.cleanup()
```
这个示例代码使用 RPi.GPIO 库进行引脚的初始化,定义了一些常量和函数,通过 GPIO 引脚控制 LCD1602 显示 "Hello, world!" 和 "From Raspberry Pi" 的信息,并清除屏幕,显示 "Goodbye!" 和 "See you later." 的信息。
希望这个回答对你有所帮助,如果你还有其他问题,可以继续提问。
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