from machine import Pin,Timer
from HCSR04 import HCSR04
from neopixel import NeoPixel
import time

RELAY = Pin(13,Pin.OUT)
trig = Pin(2, Pin.OUT)
echo = Pin(4, Pin.IN)
HC = HCSR04(trig, echo)
Distance = HC.getDistance()
Pin = Pin(15,Pin.OUT)
LED_NUM=7
np = NeoPixel(Pin,LED_NUM)
t1 = time.time()

def RELAYon():
  for i in range(LED_NUM):
     np[i] = (255,0,0)
     np.write()
     time.sleep_ms(200)
     flag = 1

def RELAYoff():
  for i in range(LED_NUM):
     np[6-i] = (0,0,0)
     np.write()
     time.sleep_ms(200)
     flag = 0

flag = 0
while True:
  Distance = HC.getDistance()
  #print(Distance)
  if Distance<90:
    t1 = time.time()
    t2 = time.time()
  else:
    t2 = time.time()
  
  if abs(t1-t2) >1 and flag == 0:
    RELAYoff()
    flag = 1
    print("off")

  if abs(t1-t2) <1 and flag == 1:
    RELAYon()
    flag = 0
    print("on")  
  
  if flag == 1:
    time.sleep(0.5)
    RELAY.on()
  
  if flag == 0:
    time.sleep(0.5)
    RELAY.off()