Build Instructions

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• 1

  setup sensors and led

  from machine import Pin,PWM
  import time
  trig = 15
  echo = 13
  led = 4

  echo = Pin(echo, Pin.IN)
  led = Pin(led, Pin.OUT)
  trig = Pin(trig, Pin.OUT)
  servo = PWM(Pin(2), freq=50, duty=77)
  trig.off()
  time.sleep_ms(2)
  trig.on()
  time.sleep_ms(10)
  trig.off()

  def get_distance(unit="cm"):
    trig.on()
    time.sleep_ms(10)
    trig.off()
    
    while echo.value() == 0:
      pass
    start = time.ticks_us()
    
    while echo.value() == 1:
      pass
    stop = time.ticks_us()
    
    d = (stop - start)/58
    distance = round(d,2)
    if unit == "mm":
      factor = 10
    elif unit == "cm":
      factor = 1
    elif unit == "m":
      factor = 0.1
      
    return distance*factor
    
  def limit(value):
    x=int(get_distance())
    if x < float(value):
      led.on()
     
      print('limit is reached')
    else:
      led.off()
    print('distance is {} cm'.format(x))
    print('limit is {} cm'.format(value))
    
  while True:
    
    limit(1000)
    time.sleep_ms(1)
    if x < 5 :
      servo.duty(30)
      time.sleep_ms(1)
      servo.duty(122)

• 2

  setup motor servo

  from machine import Pin, PWM
  from time import sleep
  servo = PWM(Pin(2), freq=50, duty=77)
  servo.duty(30)
  sleep(.5)
  servo.duty(122)

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