import network
import BlynkLib
from machine import Pin,ADC
import time

#LDR Config
ldrValue = ADC(Pin(27))
smValue = ADC(Pin(28))

MAX_ADC_READING = 65535;
ADC_REF_VOLTAGE = 3.3;
REF_RESISTANCE = 50;
LUX_CALC_SCALAR = 12518931;
LUX_CALC_EXPONENT = -1.405;

#LED Config
redLED=machine.Pin(14, machine.Pin.OUT)
blueLED=machine.Pin(15, machine.Pin.OUT)
redLED.off()
blueLED.off()

wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect("@PCCPL-WIFI","")
BLYNK_AUTH = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
# connect the network       
wait = 10
while wait > 0:
    if wlan.status() < 0 or wlan.status() >= 3:
        break
    wait -= 1
    print('waiting for connection...')
    time.sleep(1)
 
# Handle connection error
if wlan.status() != 3:
    raise RuntimeError('network connection failed')
else:
    print('connected')
    ip=wlan.ifconfig()[0]
    print('IP: ', ip)
    
 
"Connection to Blynk"
# Initialize Blynk
blynk = BlynkLib.Blynk(BLYNK_AUTH)
 
# Register virtual pin handler
@blynk.on("V1") 				#virtual pin V0
def v1_write_handler(value): 	#read the value
    if int(value[0]) == 1:
        blueLED.value(1) 		#turn the led on        
    else:
        blueLED.value(0)    	#turn the led off
    
while True:
    global ldrResistance, rawData, ldrVoltage
    rawDataSM = smValue.read_u16()
    rawData = ldrValue.read_u16()
    print(f"Raw data SM: {rawDataSM}")
    SMVoltage = rawDataSM / MAX_ADC_READING * ADC_REF_VOLTAGE;
    print(f"SMVoltage voltage: {SMVoltage}")
    SMPercent = SMVoltage * 100 / ADC_REF_VOLTAGE
    SMPercent = 100 - SMPercent 
    
    print(f"Raw data: {rawData}")
    resistorVoltage = rawData / MAX_ADC_READING * ADC_REF_VOLTAGE;
    print(f"Resistor voltage: {resistorVoltage}")
    ldrVoltage = ADC_REF_VOLTAGE - resistorVoltage;
    print(f"LDR voltage: {ldrVoltage}")
    ldrResistance = ldrVoltage/resistorVoltage * REF_RESISTANCE;
    print(f"LDR resistance: {ldrResistance}")
    ldrLux = LUX_CALC_SCALAR * pow(ldrResistance, LUX_CALC_EXPONENT);
    print(f"Lux: {ldrLux}")
    print("==========")
    
    blynk.virtual_write(5, SMPercent)
    time.sleep(0.25)
    blynk.run()