Circuit Documentation

Summary

The circuit in question is an Integrated Humidity, Infrared, and Particulates System (IHIP) designed for Internet of Things (IoT)-based indoor air quality monitoring and control. It utilizes an Arduino UNO as the main microcontroller to interface with a DHT11 humidity and temperature sensor, an IR sensor, a PM2.5 air quality sensor, and an ESP8266 WiFi module for IoT connectivity. The data collected from the sensors is displayed on an Adafruit Standard LCD 16x2 and transmitted over WiFi for remote monitoring.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Features digital I/O pins, analog inputs, a USB connection for programming, and power management capabilities

DHT11 Humidity and Temperature Sensor

• A basic, low-cost digital temperature and humidity sensor
• Provides calibrated digital output

PM2.5 Air Quality Sensor and Breadboard Adapter Kit - PMS5003

• A sensor for measuring particulate matter in the air
• Outputs data via a serial interface

IR Sensor

• An infrared sensor capable of detecting obstacles and measuring distances
• Typically used in proximity sensing applications

ESP8266 ESP-201 WiFi Module

• A low-cost WiFi microchip with full TCP/IP stack and microcontroller capability
• Used for IoT applications to send data over the internet

Adafruit Standard LCD 16x2 white on blue

• A 16x2 character LCD display
• Features white text on a blue background with backlight

Wiring Details

Arduino UNO

• 3.3V connected to ESP8266 3.3V
• 5V connected to PM2.5 Sensor VCC, DHT11 VDD, LCD VDD, and LCD LED+
• GND connected to IR Sensor vcc, PM2.5 Sensor GND, LCD VSS, and LCD LED-
• D13 connected to DHT11 DATA
• D12 connected to PM2.5 Sensor TX and LCD RS
• D11 connected to IR Sensor out and LCD E
• D5 connected to LCD DB4
• D4 connected to LCD DB5
• D3 connected to LCD DB6
• D2 connected to LCD DB7
• D1 connected to ESP8266 RX
• D0 connected to ESP8266 TX

DHT11 Humidity and Temperature Sensor

• VDD connected to Arduino 5V
• DATA connected to Arduino D13
• GND connected to Arduino GND

PM2.5 Air Quality Sensor and Breadboard Adapter Kit - PMS5003

• VCC connected to Arduino 5V
• GND connected to Arduino GND
• TX connected to Arduino D12

IR Sensor

• out connected to Arduino D11
• gnd connected to Arduino GND
• vcc connected to Arduino GND (Note: This seems to be an error in the net list, as vcc should typically be connected to a positive voltage supply)

ESP8266 ESP-201 WiFi Module

• 3.3V connected to Arduino 3.3V
• GND connected to Arduino GND
• RX connected to Arduino D1
• TX connected to Arduino D0

Adafruit Standard LCD 16x2 white on blue

• VDD connected to Arduino 5V
• VSS connected to Arduino GND
• V0 connected to a contrast adjustment potentiometer (not listed in the parts)
• RS connected to Arduino D12
• R/W connected to Arduino GND
• E connected to Arduino D11
• DB4 to DB7 connected to Arduino D5 to D2 respectively
• LED+ connected to Arduino 5V
• LED- connected to Arduino GND

Documented Code

/*
 * IHIP (Integrated Humidity, Infrared, and Particulates System)
 * Internet of Things (IoT) - based Indoor Air Quality Monitoring and Controlling
 *
 * This Arduino sketch reads data from a DHT11 sensor, an IR sensor, and a PM2.5
 * air quality sensor. It displays the data on an LCD and sends it to an ESP8266
 * WiFi module for IoT-based monitoring.
 */

#include <DHT.h>
#include <LiquidCrystal.h>

// Pin definitions
#define DHTPIN 13
#define DHTTYPE DHT11
#define IRPIN 11
#define LCD_RS 12
#define LCD_E 11
#define LCD_D4 5
#define LCD_D5 4
#define LCD_D6 3
#define LCD_D7 2

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize LCD
LiquidCrystal lcd(LCD_RS, LCD_E, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

void setup() {
  // Start serial communication
  Serial.begin(9600);

  // Initialize DHT sensor
  dht.begin();

  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("IHIP System");

  // Initialize IR sensor pin
  pinMode(IRPIN, INPUT);
}

void loop() {
  // Read humidity and temperature from DHT11
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Read IR sensor value
  int irValue = digitalRead(IRPIN);

  // Display data on LCD
  lcd.setCursor(0, 1);
  lcd.print("H:");
  lcd.print(humidity);
  lcd.print("% T:");
  lcd.print(temperature);
  lcd.print("C");

  // Send data to ESP8266
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("% Temperature: ");
  Serial.print(temperature);
  Serial.print("C IR: ");
  Serial.println(irValue);

  // Wait for 2 seconds before next loop
  delay(2000);
}

This code is designed to be uploaded to the Arduino UNO microcontroller. It initializes the connected sensors and LCD, reads sensor data, displays it on the LCD, and sends it over serial to the ESP8266 for remote monitoring.