import machine
import time
from umqtt import MQTTClient
from network import WLAN


main()


def main():
    setup_wifi()
    username = "your Adafruit IO username"
    mqtt = MQTTClient(client_id=str(machine.rng()), server="io.adafruit.com", port=8883,
                      user=username, password="your Adafruit IO password", ssl=True)
    mqtt.connect()
    adc = machine.ADC()
    pin = adc.channel(pin="P20")
    samples = 100
    while True:
        temperature = measure_temperature(samples, pin)
        print(temperature)
        mqtt.publish("{}/feeds/office-temperature".format(username), str(temperature))
        time.sleep(30)


def setup_wifi():
    wlan = WLAN(mode=WLAN.STA)
    wlan.antenna(WLAN.EXT_ANT)
    wlan.connect("your WiFi SSID", auth=(WLAN.WPA2, "your WiFi password"), timeout=5000)
    while not wlan.isconnected():
        machine.idle()


def measure_temperature(samples, pin):
    temperature = 0
    for _ in range(samples):
        temperature += analog_to_temperature(pin())
    temperature /= samples
    return temperature


def analog_to_temperature(adc_value):
    temp = 100 * (adc_value / 4095) - 50
    return temp