#include <LiquidCrystal_I2C.h>

// Inicializa el LCD con dirección I2C 0x27 y tamaño 20x4
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  // Inicializa el LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Air Purity Sensor");

  pinMode(A1, INPUT); 

  // Inicializa la comunicación serial para debugging
  Serial.begin(9600);
}

void loop() {

  float air_purity = analogRead(A1);  
  air_purity = (air_purity*100.00)/1023.00;
  

  lcd.setCursor(0, 1);
  lcd.print("Air Purity: ");
  lcd.print(air_purity);
  lcd.print("%              ");


  // Imprime el valor de pureza en el monitor serial para debugging
  Serial.print("Air Purity: ");
  Serial.println(air_purity);

  delay(500); // Espera 1 segundo antes de actualizar el valor
}


sketch.ino

diagram.json

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries

LiquidCrystal I2C


libraries.txt

air-sensor

air-sensor.chip.json

// Wokwi Custom Chip - For docs and examples see:
// https://docs.wokwi.com/chips-api/getting-started
//
// SPDX-License-Identifier: MIT
// Copyright 2023 Edwin Lopez

#include "wokwi-api.h"
#include <stdio.h>
#include <stdlib.h>

typedef struct {
  pin_t pin_in;           // Pin analógico para leer la pureza del aire
  pin_t pin_out;          // Pin digital para indicar si la pureza es baja
  pin_t pin_vcc;          // Pin de alimentación
  pin_t pin_gnd;          // Pin de tierra
  uint32_t air_purity_attr;      // Atributo de pureza del aire
} chip_state_t;

static void chip_timer_event(void *user_data);

void chip_timer_event(void *user_data) {
  chip_state_t *chip = (chip_state_t*)user_data;

  float air_purity_attr = attr_read_float(chip->air_purity_attr);
  
  float voltage = (air_purity_attr)*5.00/100.00;

  if(pin_read(chip->pin_vcc) && !pin_read(chip->pin_gnd)){
    pin_dac_write(chip->pin_in,voltage);
  }

  if(air_purity_attr<50){
    pin_write(chip->pin_out, HIGH);
  }else{
    pin_write(chip->pin_out, LOW);
  }

}

void chip_init() {
  chip_state_t *chip = malloc(sizeof(chip_state_t));

  chip->pin_in = pin_init("IN", ANALOG);
  chip->pin_out = pin_init("OUT", OUTPUT_LOW);
  chip->pin_vcc = pin_init("VCC", INPUT_PULLDOWN);
  chip->pin_gnd = pin_init("GND", INPUT_PULLUP);
  chip->air_purity_attr = attr_init("airPull", 10.00);

  const timer_config_t timer_config = {
    .callback = chip_timer_event,
    .user_data = chip,
  };

  timer_t timer_id = timer_init(&timer_config);
  timer_start(timer_id, 1000, true);

  printf("Hello from custom air purity chip!\n");
}
