distanceLux.py

   1 from machine import Pin, I2C, time_pulse_us
   2 import veml7700, time
   3 oled=Pin(25,Pin.OUT)
   4 i2c = I2C(0, scl=Pin(1), sda=Pin(0), freq=10000) # connected on i2c0
   5
   6 veml = veml7700.VEML7700(address=0x10, i2c=i2c, it=100, gain=1/8)
   7
   8 SOUND_SPEED=340
   9 TRIG_PULSE_DURATION=10
  10
  11 trig_pin=Pin(2, Pin.OUT)
  12 echo_pin=Pin(3,Pin.IN)
  13
  14 oled.off()
  15 time.sleep(0.5)
  16 global lux_val
  17 global distance_cm
  18 lux_val=str(0)
  19 distance_cm=str(0)
  20
  21 oled.on()
  22
  23 def distance():
  24     trig_pin.value(0)
  25     time.sleep_us(5)
  26     trig_pin.value(1)
  27     time.sleep_us(TRIG_PULSE_DURATION)
  28     trig_pin.value(0)
  29     ultransonic_duration=time_pulse_us(echo_pin,1,30000)
  30     global distance_cm
  31     distance_cm=SOUND_SPEED*ultransonic_duration/20000
  32     if distance_cm <= 100:
  33         distance_cm=0
  34     if distance_cm >= 101:
  35         distance_cm=1
  36     return(distance_cm)
  37
  38 def measure():
  39     global lux_val
  40     lux_val = veml.read_lux()
  41     if lux_val<=2:
  42         lux_val=0
  43     if lux_val >= 3:
  44         lux_val=1
  45     return(lux_val)
  46
  47 while True:
  48     measure()
  49     distance()
  50     print(str(lux_val)+' '+str('%.0f'%distance_cm))
  51     time.sleep(.5)
  52