import machine
import time
import urequests
import network

# Replace with your WiFi credentials
ssid = "Airtel 4G"
password = "8500182257@"

# ThingSpeak details
api_key = "1I3VSY9ALR9C4QFG"
channel_id = "2456546"

# Define GPIO pins
trig_pin = machine.Pin(15, machine.Pin.OUT)
echo_pin = machine.Pin(14, machine.Pin.IN)

def get_distance():
    # Send a pulse
    trig_pin.value(1)
    time.sleep_us(10)
    trig_pin.value(0)

    # Measure pulse duration
    start_time = time.ticks_us()
    while echo_pin.value() == 0:
        pass
    start_time = time.ticks_us()

    while echo_pin.value() == 1:
        pass
    pulse_duration = time.ticks_us() - start_time

    # Calculate distance
    distance_cm = pulse_duration * 0.034 / 2
    return distance_cm

def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    if not wlan.isconnected():
        print("Connecting to WiFi...")
        wlan.connect(ssid, password)
        while not wlan.isconnected():
            time.sleep(0.5)
    print("Connected to WiFi")

while True:
    connect_wifi()  # Connect to WiFi on every loop

    distance = get_distance()
    print(f"Distance: {distance} cm")

    # Send data to ThingSpeak
    url = f"https://api.thingspeak.com/update.json"
    headers = {'Content-Type': 'application/json'}
    data = {'api_key': api_key, 'field1': distance}
    response = urequests.post(url, headers=headers, json=data)
    if response.status_code != 200:
        print("Failed to send data to ThingSpeak:", response.text)

    # Wait for a few seconds before sending the next data
    time.sleep(15)