#from machine import Pin, Timer
import machine
import network
import urequests # for http  API
import time

# WiFi credentials
SSID = "Wokwi-GUEST"
PASSWORD = ""

# Initialize ADC (LDR connected to GPIO34)
adc = machine.ADC(machine.Pin(34))
adc.atten(machine.ADC.ATTN_11DB)  # Full range: 3.3V
# Function to connect to local WiFi

def connect_wifi():
    wifi = network.WLAN(network.STA_IF)
    wifi.active(True)
    wifi.disconnect()
    wifi.connect(SSID,PASSWORD)
    if not wifi.isconnected():
        print('connecting..')
        timeout = 0
        while (not wifi.isconnected() and timeout < 10):
            print(10 - timeout)
            timeout = timeout + 1
            time.sleep(1) 
    if(wifi.isconnected()):
        print('connected')
    else:
        print('not connected')
        sys.exit()
    print('network config:', wifi.ifconfig())
        
connect_wifi() # Connecting to WiFi Router

# ThingSpeak settings
# Thingspeak HTTP API Protocol (Connection)
HTTP_HEADERS = {'Content-Type': 'application/json'} 
#THINGSPEAK_URL = 'https://api.thingspeak.com/update'
#WRITE_API_KEY = 'YOUR_THINGSPEAK_WRITE_API_KEY'  # Replace with your ThingSpeak Write API Key
THINGSPEAK_WRITE_API_KEY = '4ZV4EMSFR3A0EPRL' 

# Function to read LDR value
def read_ldr():
    value = adc.read()
    voltage = value * (3.3 / 4095)  # Convert ADC value to voltage
    return voltage

while True:
    time.sleep(5) 
    # Read LDR value
    ldr_value = read_ldr()
    print(f"LDR Value: {ldr_value:.4f} V")
    # Initialize ADC (LDR connected to GPIO34)
    adc = machine.ADC(machine.Pin(34))
    adc.atten(machine.ADC.ATTN_11DB)  # Full range: 3.3V

    ldr_readings = {'field3':ldr_value} 
    # Send data to ThingSpeak
    request = urequests.post( 'http://api.thingspeak.com/update?api_key=' + THINGSPEAK_WRITE_API_KEY, json = ldr_readings, headers = HTTP_HEADERS )  
    request.close() 
    print(ldr_readings) 
    print(" Msg sent to Thingspeak channel successfully...")
    print(" ********************************************")