ESP32 Auto Control Fan using DHT11 Sensor with LCD (MicroPython)

Control Fan with ESP32 board and DHT11 Sensor. Monitor Temperature and Humidity. Turn fan on if High Temperature. Turn fan off if Low Temperature. Show status on LCD Display.

MicroPython Code – ESP32 Auto Control Fan using DHT11 Sensor with LCD Display

from machine import Pin, SoftI2C
from i2c_lcd import I2cLcd
import time
import _thread
import dht

# FAN
fan = Pin(32, Pin.OUT)
fan.off()

# LCD
i2c = SoftI2C(scl=Pin(22), sda=Pin(21),freq=100000)
lcd = I2cLcd(i2c, 0x27,2,16)
time.sleep(1)
lcd.clear()

# DHT11
d = dht.DHT11(Pin(23))
t = 0
h = 0

def check_temp():
    print('Check Temp Starting...')
    global t
    global h
    while True:
        try:
            d.measure()
            time.sleep(2)
            t = d.temperature()
            h = d.humidity()
            temp = 'Temp: {:.0f} C'.format(t)
            humid = 'Humidity: {:.0f} %'.format(h)
            print('DHT11:', t, h)
            time.sleep(5)
        except:
            pass

# START
text = 'Starting...'
lcd.putstr(text)

# RUN
global fan_status
fan_status = 'OFF'

def show_lcd():
    while True:
        try:
            temp = 'Temp: {:.0f} C'.format(t)
            humid = 'Humidity: {:.0f} %'.format(h)
            fan_s = 'FAN : {:}'.format(fan_status)
            lcd.clear()
            lcd.putstr(fan_s)
            time.sleep(2)
            lcd.clear()
            lcd.putstr(temp)
            lcd.move_to(0,1)
            lcd.putstr(humid)
            time.sleep(2)
        except:
            pass

def auto_fan():
    global fan_status
    while True:
        if t > 30:
            time.sleep(1)
            fan.on()
            fan_status = 'ON (AUTO)'
            time.sleep(10)    # TURN ON FAN 10 sec
            fan.off()
            fan_status = 'OFF (AUTO)'
            time.sleep(10)
        else:
            pass

_thread.start_new_thread(check_temp,())
_thread.start_new_thread(show_lcd,())
_thread.start_new_thread(auto_fan,())