from machine import Pin, Timer
from machine import Pin, time_pulse_us #ultra*
import network
import urequests # for http  API
import time
#from umqtt.robust import MQTTClient # for MQTT Broker
import sys
#import dht
from dht import DHT22

dht22 = DHT22(Pin(13))

# Function to read DHT
def readDht():
    dht22.measure()
    return dht22.temperature(), dht22.humidity()
    # test DHT function
print (readDht())
SOUND_SPEED=340 # Vitesse du son dans l'air
TRIG_PULSE_DURATION_US=10

trig_pin = Pin(12, Pin.OUT) #ultra*
echo_pin = Pin(14, Pin.IN) #ultra*

# Split Sensor reading..
#temp, hum = readDht()

# Connect with WiFi

WIFI_SSID = "Wokwi-GUEST"
WIFI_PASSWORD = ""

# Function to connect to local WiFi

def connect_wifi():
    wifi = network.WLAN(network.STA_IF)
    wifi.active(True)
    wifi.disconnect()
    wifi.connect(WIFI_SSID,WIFI_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 HTTP API Protocol (Connection)

HTTP_HEADERS = {'Content-Type': 'application/json'} 
THINGSPEAK_WRITE_API_KEY = '2UFR738DW1SXE5SJ' # Write API of the Channel
    
while True:
   # Prepare le signal
    trig_pin.value(0)
    time.sleep_us(5)
    # Créer une impulsion de 10 µs
    trig_pin.value(1)
    time.sleep_us(TRIG_PULSE_DURATION_US)
    trig_pin.value(0)

    ultrason_duration = time_pulse_us(echo_pin, 1, 30000) # Renvoie le temps de propagation de l'onde (en µs)
    distance_cm = SOUND_SPEED * ultrason_duration / 20000

    print(f"Distance : {distance_cm} cm")
    object = distance_cm
    time.sleep_ms(500) 
    
    #pin = Pin(12, Pin.OUT, Pin.PULL_DOWN) #Rpi
    dht22 = DHT22(Pin(13)) #DHT22 object created at Pin 12
    dht22.measure()
    print("Temperature: {}".format(dht22.temperature()))
    print("Humidity: {}".format(dht22.humidity()))
    
    temp  = dht22.temperature() # store dht22 temperature into temp variable
    hum = dht22.humidity()

    dht_readings = {'field2':hum, 'field3':temp, 'field4':object} 
    request = urequests.post( 'http://api.thingspeak.com/update?api_key=' + THINGSPEAK_WRITE_API_KEY, json = dht_readings, headers = HTTP_HEADERS )  
    request.close() 
    print(dht_readings) 
    print(" Msg sent to Thingspeak channel successfully...")
    print(" ********************************************")