import machine
import time
import urequests
import network
import ujson

# ThingSpeak settings
THINGSPEAK_API_KEY = "NEJ4AU0GAQ1WBS8R"
THINGSPEAK_URL = "http://api.thingspeak.com/update"

# Wi-Fi settings
WIFI_SSID = "Kabix"
WIFI_PASSWORD = "Kabix_xii"

# Ultrasonic sensor pins
TRIG_PIN = machine.Pin(5, machine.Pin.OUT)
ECHO_PIN = machine.Pin(12, machine.Pin.IN)

# Function to read distance from ultrasonic sensor
def read_distance():
    TRIG_PIN.value(1)
    time.sleep_us(10)
    TRIG_PIN.value(0)
    while ECHO_PIN.value() == 0:
        pulse_start = time.ticks_us()
    while ECHO_PIN.value() == 1:
        pulse_end = time.ticks_us()
    pulse_duration = time.ticks_diff(pulse_end, pulse_start)
    distance = pulse_duration * 0.0343 / 2  # Speed of sound in cm/us
    return distance

# Function to send data to ThingSpeak
def send_data_to_thingspeak(distance):
    data = {
        "api_key": THINGSPEAK_API_KEY,
        "field1": distance
    }
    response = urequests.post(THINGSPEAK_URL, data=ujson.dumps(data), headers={"Content-Type": "application/json"})
    response.close()

# Initialize the Wi-Fi connection
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(WIFI_SSID, WIFI_PASSWORD)

# Wait for the Wi-Fi connection to establish
while not wifi.isconnected():
    time.sleep(1)

print("Connected to Wi-Fi")

if __name__ == "__main__":
    try:
        while True:
            distance = read_distance()
            send_data_to_thingspeak(distance)
            print("Data sent to ThingSpeak: Distance =", distance, "cm")
            time.sleep(15)  # Send data every 15 seconds (adjust the interval as needed)
    except KeyboardInterrupt:
        pass