"""
https://docs.wokwi.com/parts/wokwi-photoresistor-sensor
There are two parameters that control the sensitivity of the LDR:
rl10 is the resistance of the LDR at illumination level of 10 lux
Resistance sensitivity (resistance change as function of illumination level change) 
           in linear approximation expressed as γ (values about 0.8 to 0.95).
The gamma value determines the slope of the log(R) / log(lux) graph
gamma = log(Ra/Rb) / log (a/b)   a ,b : lux in points a,b , Ra Rb - resistance of ldr in those points
from table in wokvi web :
lux         0.1,        1,     10,    50,     100,    400,   1000,   10000,  100000
LDR KOhm :  1.25*1e2    250    50     16.2     9.98   3.78   1.99    0.397   0.079
The defaults are RL10 = 50, and GAMMA = 0.7    RL10 - resistance in 10 lux,  RL100 - resistance in 100 lux
pow() function returns the value of x to the power of y (xy).
"""

from machine import Pin, ADC
from time import sleep

debug = 1  #  לצרכי הדפסה במעקב בתוכנית 

######  נתונים של הפוטורזיסטור ###########
my_adc = ADC(Pin(27))
GAMMA = 0.7;
RL10 = 50*1e3
RL50 = 16.2*1e3
RL100 = 9.98*1e3
#gamma = math.log(50*1e3/9.98*1e3)/mat.log(10/100)
resolution = 3.3 / 4096
print('resolution = ',resolution)

lux_table = [ 0.1, 1, 10, 50, 100, 400, 1000, 10000, 100000]

######  פונקציות של הפוטו רזיסטור ####
def photoresistor():
    photo_resistor_analog_value = my_adc.read()   #  קריאת הממיר 
    voltage = resolution * photo_resistor_analog_value   # המתח המחושב שנמדד על הפוטורזיסטור 
    ldr_resistance=10*1e3*voltage/(3.3-voltage)   #  ההנגדות המחושבת של הפוטורזיסטור 
    lux = pow(RL10 * pow(10, GAMMA) / ldr_resistance, (1 / GAMMA))  # עוצמת ההערה המחושבת 
    print('value read = ', photo_resistor_analog_value)
    print ('voltage = ', voltage)
    print('resistance = ', ldr_resistance)
    print ('illumination = ', lux , 'lux')
    print()
    return lux

###### ואתחול ההדקים לפלט bargraph  נתוני ההדקים של המיקרו המתחברים אל ה ######

bargraph_pins = [15 , 2, 4 , 5, 18, 19, 21, 22,  23, 32]
leds = [Pin(pin, Pin.OUT) for pin in bargraph_pins]

################# barGraph פונקציות השייכות ל  #########
def bargraph(luxa):
    range=check_range(luxa)
    if debug:
      print('range = ', range, 'lux = ', luxa)
    turn_on(range)

'''    
def check_range(luxi):
  if luxi<=0.103:
    return 1
  elif luxi>0.101 and luxi <=1 :
    return 2
  elif luxi>1 and luxi <=10 :
    return 3
  elif luxi>10 and luxi <=50 :
    return 4
  elif luxi>50 and luxi <=100 :
    return 5 
  elif luxi>100 and luxi <=400 :
    return 6 
  elif luxi>400 and luxi <=1000 :
    return 7
  elif luxi>1000 and luxi <=10000 :
    return 8
  elif luxi>10000 and luxi <=100000 :
    return 9      
  elif luxi>100000 :
    return 10  
 '''   
 
def check_range(luxi):
  for i in range(len(lux_table)-2):
    if debug:
      print('len(lux_table)-2 = ', len(lux_table)-2 , 'i = ',i)
    if luxi >= lux_table[i]   and  luxi < lux_table[i+1] :
      if debug:
        print ('len lux_table = ' , len(lux_table), 'luxi = ' , luxi , 'lux_table [' , i,'] = ', lux_table[i])
        print ('i = ' ,i)
      return(i)
    #elif luxi > lux_table[len(lux_table)-1]:
    #  return i+2

def turn_off():
    # bar_graph  כיבוי כל הלדים ב 
    for x in leds:
        x.value(0)

def turn_on(how_many):
    turn_off()
    if debug:
      print ('how_many = ', how_many)
    for i in range(how_many):
        leds[i].value(1)

##############  פונקציות השייכות לפוטו רזיסטור   ########


def main():
  for i in range(len(bargraph_pins)):
      turn_on(i)
      sleep(0.1)
  turn_off()
  for i in range(len(bargraph_pins),0,-1):
      turn_on(i)
      sleep(0.1)  
  turn_off()
  sleep(1)
  while True:
    my_lux = photoresistor()
    print('my_lux = ' , my_lux)
    bargraph(my_lux)
    sleep(2)
            
main()