import network
import urequests
import time
import dht
from machine import Pin, Timer


# Wi-Fi settings
WIFI_SSID = "Wokwi-GUEST"
WIFI_PASSWORD = ""

# Connect to Wi-Fi
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(WIFI_SSID, WIFI_PASSWORD)

# Wait for connect or fail
max_wait = 10
while max_wait > 0:
    if wlan.status() < 0 or wlan.status() >= 3:
        break
    max_wait -= 1
    print("waiting for connection...")
    time.sleep(1)

# Check for successful connection
if wlan.status() != 3:
    raise RuntimeError('Wi-Fi connection failed')
else:
    print('Connected. IP address:', wlan.ifconfig()[0])

# ThingSpeak settings
WRITE_API_KEY = '8LQ9VBV5TLUQ5KQQ'
base_url = 'https://api.thingspeak.com/update'

# Initialize DHT22 sensor
dht_sensor = dht.DHT22(Pin(15))

# Initialize HC-SR04 sensor pins
trig = Pin(3, Pin.OUT)
echo = Pin(2, Pin.IN)
timer = Timer()

  # Function to measure distance using HC-SR04
def measure_distance():
    trig.low()
    time.sleep_us(2)
    trig.high()
    time.sleep_us(5)
    trig.low()

    while echo.value() == 0:
        pass
    start = time.ticks_us()

    while echo.value() == 1:
        pass
    end = time.ticks_us()

    distance = (time.ticks_diff(end, start) / 1000000) * 340 / 2
    return distance

  # Function to read from sensors and upload to ThingSpeak
def read_and_upload():
    dht_sensor.measure()
    temp = dht_sensor.temperature()
    hum = dht_sensor.humidity()
    distance = measure_distance()
    
    # Assuming distance is measured every second, calculate speed as delta distance
    # This is a placeholder, you need an actual method to measure changes in distance over time for speed
    speed = distance
    
    # Prepare the payload
    payload = 'api_key=' + WRITE_API_KEY + '&field1=' + str(temp) + '&field2=' + str(hum) + '&field3=' + str(speed)
    # Send the request
    response = urequests.get(base_url + '?' + payload)
    print(response.text)
    response.close()

  # Main loop
while True:
    read_and_upload()
    time.sleep(40)