import RPi.GPIO as GPIO from LCD1602 import LCD_1602 import time BtnPin = 13 R = 4 G = 12 B = 6 TRIG = 17 ECHO = 18 flag = 2 buzzer = 20 GPIO.setwarnings(False) GPIO.setmode(GPIO.BCM) GPIO.setup(TRIG,GPIO.OUT,initial=GPIO.LOW) GPIO.setup(ECHO,GPIO.IN) GPIO.setup(R,GPIO.OUT) GPIO.setup(B, GPIO.OUT) GPIO.setup(G, GPIO.OUT) GPIO.setup(buzzer, GPIO.OUT) GPIO.setup(BtnPin,GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.output(buzzer,GPIO.HIGH) m_lcd = LCD_1602(Address=0x27, bus_id=1, bl=1) flag = m_lcd.lcd_init() while True: if GPIO.input(BtnPin) == 0: flag += 1 elif GPIO.input(BtnPin) == 1: pass if flag % 2 == 0: for i in range(10): GPIO.output(G,GPIO.LOW) GPIO.output(B,GPIO.LOW) GPIO.output(buzzer,GPIO.HIGH) GPIO.output(TRIG,GPIO.HIGH) time.sleep(0.000015) GPIO.output(TRIG,GPIO.LOW) while not GPIO.input(ECHO): pass t1 = time.time() while GPIO.input(ECHO): pass t2 = time.time() distance = round((t2-t1) * 340 / 2,5) if distance < 0.2: GPIO.output(B,GPIO.HIGH) GPIO.output(buzzer,GPIO.LOW) print("当前的距离为:",distance) a = '%f'%distance m_lcd.lcd_display_string(0, 0, 'The distance is') m_lcd.lcd_display_string(0, 1, a) m_lcd.lcd_display_string(8, 1, 'm') time.sleep(1) elif flag % 2 == 1: GPIO.output(G,GPIO.HIGH) GPIO.cleanup() ，我需要把灯和蜂鸣器还有其他的代码都用函数封装起来

好的，你可以尝试以下的代码：

import RPi.GPIO as GPIO 
from LCD1602 import LCD_1602 
import time 

BtnPin = 13 
R = 4 
G = 12 
B = 6 
TRIG = 17 
ECHO = 18 
buzzer = 20 

GPIO.setwarnings(False) 
GPIO.setmode(GPIO.BCM) 

GPIO.setup(TRIG, GPIO.OUT, initial=GPIO.LOW) 
GPIO.setup(ECHO, GPIO.IN) 
GPIO.setup(R, GPIO.OUT) 
GPIO.setup(B, GPIO.OUT) 
GPIO.setup(G, GPIO.OUT) 
GPIO.setup(buzzer, GPIO.OUT) 

GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) 
GPIO.output(buzzer, GPIO.HIGH) 

m_lcd = LCD_1602(Address=0x27, bus_id=1, bl=1) 
flag = m_lcd.lcd_init() 

def get_distance(): 
    GPIO.output(TRIG, GPIO.HIGH) 
    time.sleep(0.000015) 
    GPIO.output(TRIG, GPIO.LOW) 
    
    while not GPIO.input(ECHO): 
        pass 
        
    t1 = time.time() 
    
    while GPIO.input(ECHO): 
        pass 
        
    t2 = time.time() 
    distance = round((t2-t1) * 340 / 2, 5) 
    
    return distance 

def display_distance(distance): 
    a = '%f'%distance 
    m_lcd.lcd_display_string(0, 0, 'The distance is') 
    m_lcd.lcd_display_string(0, 1, a) 
    m_lcd.lcd_display_string(8, 1, 'm') 

def turn_on_red(): 
    GPIO.output(R, GPIO.HIGH) 

def turn_on_green(): 
    GPIO.output(G, GPIO.HIGH) 

def turn_on_blue(): 
    GPIO.output(B, GPIO.HIGH) 

def turn_off_leds(): 
    GPIO.output(R, GPIO.LOW) 
    GPIO.output(G, GPIO.LOW) 
    GPIO.output(B, GPIO.LOW) 

def turn_on_buzzer(): 
    GPIO.output(buzzer, GPIO.LOW) 

def turn_off_buzzer(): 
    GPIO.output(buzzer, GPIO.HIGH) 

def main(): 
    while True: 
        if GPIO.input(BtnPin) == 0: 
            flag += 1 
        elif GPIO.input(BtnPin) == 1: 
            pass 
        if flag % 2 == 0: 
            turn_off_leds() 
            turn_on_buzzer() 
            distance = get_distance() 
            if distance < 0.2: 
                turn_on_blue() 
                turn_off_buzzer() 
            display_distance(distance) 
            time.sleep(1) 
        elif flag % 2 == 1: 
            turn_on_green() 

if __name__ == '__main__': 
    main() 
    GPIO.cleanup() 

这个代码将灯和蜂鸣器的控制代码都封装成了函数，使代码更加模块化。