temp_ultra.py

import RPi.GPIO as GPIO
import time


GPIO.setmode(GPIO.BOARD)

TRIG = 16
ECHO = 18
i= 0

GPIO.setup(TRIG,GPIO.OUT)
GPIO.setup(ECHO,GPIO.IN)

GPIO.output(TRIG, GPIO.LOW)
print("Calibrating.....")
time.sleep(2)

print("Place the object......")


try:
    while True:
        GPIO.output(TRIG, GPIO.HIGH)
        time.sleep(0.00001)
        GPIO.output(TRIG, GPIO.LOW)
    
    while GPIO.input(ECHO)==0:
        print("ashita2")
        pulse_start = time.time()
    
    while GPIO.input(ECHO)==1:
        print("Ashita3")
        pulse_end = time.time()
    
    pulse_duration = pulse_end - pulse_start
    
    distance = pulse_duration * 17150
    
    distance = round(distance+1.15, 2)
    
    if distance<=20 and distance>=5:
      print("distance:",distance,"cm")
      i=1
      
    if distance>20 and i==1:
      print("place the object....")
      i=0
    time.sleep(2)

except KeyboardInterrupt:
     GPIO.cleanup()# cleanup all GPIO