Vehicle Reverse sensor Alarm system with Ultrasonic sound sensor and Raspberry pi pico

 

# In this Project We will create a Vehicle Reverse Alarm system with Ultrasonic sound sensor(HCSR04)

from machine import Pin# first we import machine module.

import utime# import utime 

import time#import time

echo=Pin(2,Pin.IN)#echo is Pin 2 and assigned as IN Put.

trigger= Pin(3,Pin.OUT)# trigger is Pin 3 and assigned as Out Put

buzzer= Pin(4,Pin.OUT)#buzzer is Pin 4 and assigned as Out put

led_Red = Pin(5,Pin.OUT)#led_Red is connected to Pin 5 and assigned as an Out Put

led_Yellow =Pin(6,Pin.OUT)#led_Yellow is connected to Pin 6 and assigned as an Out Put

led_Blue = Pin(7,Pin.OUT)#led_Blue is connected to Pin 7 and assigned as an Out Put

led_Green = Pin(8,Pin.OUT)#led_Green is connected to Pin 8 and assigned as an Out Put

while True:# infinite loop 

    trigger.value(0)# first keep the Trigger input Low

    utime.sleep_us(2)#providing a 2 microsecond delay

    trigger.value(1)# sending a High value to trigger

    utime.sleep_us(5)keeping the delay of 5 micro second

    while echo.value()==0:

        signaloff = utime.ticks_us()

    while echo.value()==1:

        signalon = utime.ticks_us()

    timepassed = signalon - signaloff

    distance =(timepassed *0.0343)/2# calculating the time to a constant value for conversion

    print("The distance",distance,"cm")# printing the value of distance variable in shell

    utime.sleep(2)# time delay 2 micro second

    

    if distance <=30:#condition checking if distance is equal or less than 30 CM

        led_Red.on()#turning On the Red led

        led_Yellow.on()#turning On the Yellow led

        led_Blue.on()#turning On the Blue led

        led_Green.on()#turning On the Green led

        

        for j in range(50):# Buzzer Beep function

         buzzer.toggle()

         time.sleep_ms(10)

    else:

        buzzer.off()#turning Off the buzzer

        led_Red.off()#turning On the Red led

        

        

    if distance <=40::#condition checking if distance is equal or less than 40 CM

        led_Yellow.on()

        led_Blue.on()

        led_Green.on()

    else:

        led_Yellow.off()

        led_Blue.off()

        led_Green.off()

        

    if distance <= 50::#condition checking if distance is equal or less than 50 CM

        led_Blue.on()

        led_Green.on()

    else:

        led_Blue.off()

        led_Green.off()

        

    if distance <= 60::#condition checking if distance is equal or less than 60 CM

        led_Green.on()

    else:

        led_Green.off()