import time
import sys
import network 
import urequests
from math import pow 
from machine import Pin, Timer, ADC

ldr = ADC(34)

WIFI_SSID = "Wokwi-GUEST"
WIFI_PASSWORD = ""

def analog_to_lux(analog_value):
    GAMMA = 0.7
    RL10 = 33

    voltage = analog_value / 4096. * 3.3;
    resistance = 2000 * voltage / (1 - voltage / 3.3);
    lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
    
    return lux

def connect_to_wifi():
    wifi = network.WLAN(network.STA_IF)
    wifi.active(True)
    wifi.disconnect()
    wifi.connect(WIFI_SSID,WIFI_PASSWORD)
    if not wifi.isconnected():
        print('Conectando..')
        timeout = 0
        while (not wifi.isconnected() and timeout < 10):
            print(10 - timeout)
            timeout = timeout + 1
            time.sleep(1) 
    if(wifi.isconnected()):
        print('Conectado!')
    else:
        print('NÃO Conectado!')
        sys.exit()
    print('Config. da rede', wifi.ifconfig())
        
connect_to_wifi()

HTTP_HEADERS = {'Content-Type': 'application/json'} 
THINGSPEAK_WRITE_API_KEY = 'C80JAXRALD4PCGJM' 

while True:
    lux = analog_to_lux(ldr.read())
    print(f'Lux: {lux}')

    json = {'field1': lux}
    req = urequests.post(f'http://api.thingspeak.com/update?api_key={THINGSPEAK_WRITE_API_KEY}', json=json, headers=HTTP_HEADERS)    
    print(req.status_code)
    req.close()

    print(json)
    print(f'| Dados enviados |')
    time.sleep(10)