Raspberry pie GPIO pin controls traffic light and buzzer

Reference resources ：
https://blog.csdn.net/weixin_44415639/article/details/114600919
https://blog.csdn.net/chenbo163/article/details/78716269
https://blog.51cto.com/u_11643026/4291142
The programming pin used in this article is the physical engine code BOARD

1、GPIO Control package installation

Reference resources ：https://blog.csdn.net/weixin_42078116/article/details/119329032
gpio -v edition 2.52 Talent ,2.50 see gpio readall Output error
It needs to be installed separately ：

wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb

gpio readall

2、 Code control traffic lights and active buzzers

1） traffic lights
GND The pin is used for grounding ,（GND The pin is inserted in 9, Red is inserted in 11; Yellow inserted in 13, Green is inserted in 15）
2） Active buzzer
3 One pin ,GND The pin is used for grounding ,VCC The pin is used to connect 3.3V The power supply ,I/O Pins are used for GPIO Program control buzzer ;（GND The pin is inserted in 39, here VCC Insert corresponding in 17;I/O The pin is inserted in 37）
Active buzzer , Because it is a low level trigger , Initially set to high level GPIO.HIGH Can not sound

#!/usr/bin/python
#coding:utf-8
 
import RPi.GPIO as GPIO
import time
 
GPIO.setmode(GPIO.BOARD)
#  Initialize the pins , Because it's a low level trigger , Initially set to high level 
GPIO.setup(37, GPIO.OUT,initial=GPIO.HIGH)    # Buzzer 
GPIO.setup(11,GPIO.OUT)     # red 
GPIO.setup(13,GPIO.OUT)     # yellow 
GPIO.setup(15,GPIO.OUT)      # green 

 
 
def blink():
    # By alternately outputting high and low electric frequencies LED Light flashing 
    # The red light is on 10s
    GPIO.output(11,GPIO.HIGH)
    time.sleep(10)
    GPIO.output(11,GPIO.LOW)
    time.sleep(0.5)
    # The yellow light is on 3s
    GPIO.output(13,GPIO.HIGH)
    time.sleep(3.0)
    GPIO.output(13,GPIO.LOW)
    time.sleep(0.5)
    
    #  The green light is on 10s
    GPIO.output(15,GPIO.HIGH)
    time.sleep(10)
    GPIO.output(15,GPIO.LOW)
    time.sleep(0.5)
    #  The yellow light is on 3s
    GPIO.output(13,GPIO.HIGH)
    time.sleep(3.0)
    GPIO.output(13,GPIO.LOW)
    GPIO.output(37,GPIO.LOW)
    time.sleep(3.0)
    GPIO.output(37,GPIO.HIGH)
  
    
 
# The main program 
try:
    # Loop execution 
    while True:
        
            blink()
 
except KeyboardInterrupt:
    pass
 
GPIO.cleanup()

Raspberry pie traffic lights GPIO