from machine import Pin, ADC, I2C
from neopixel import NeoPixel
import time
import utime
import ssd1306
#https://wokwi.com/projects/442901490550147073
mq2 = ADC(Pin(34))
mq2.atten(ADC.ATTN_11DB)

I2C_SCL = 22
I2C_SDA = 21

i2c = I2C(0, scl=Pin(I2C_SCL), sda=Pin(I2C_SDA), freq=400000)
oled = ssd1306.SSD1306_I2C(128, 64, i2c)

num_leds=4
neo =NeoPixel(Pin(27), num_leds)

def limpiar_pantalla():
    oled.fill(0)
    oled.show()
def mostrar_texto(texto, x, y):
    oled.text(texto, x, y)
    oled.show()


def set_color(r,g,b):
    for i in range(num_leds):
        neo[i]=(r,g,b)
    neo.write()

while True:
    valorGas= mq2.read()
    print("El valor del gas es de ")
    print(valorGas)

    limpiar_pantalla()
    mostrar_texto("Gas: ", 24, 0)
    mostrar_texto(str(valorGas), 24, 16)

    if(valorGas<900):
        set_color(0,255,0)
        
    elif(valorGas>1000 and valorGas<2000):
        set_color(255,0,0)

    time.sleep(1)