Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various sensors, actuators, and an OLED display. The components include a DHT11 temperature and humidity sensor, flame sensor, IR sensors, a buzzer, LEDs, a DC motor driver (L298N), DC motors, and a 1.3" OLED display. The circuit is designed to read sensor data, display it on the OLED screen, and control actuators based on sensor inputs.

Component List

1. Arduino UNO

   • Description: Microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. L298N DC Motor Driver

   • Description: Dual H-Bridge motor driver.
   • Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB

3. DC Motor

   • Description: Standard DC motor.
   • Pins: pin 1, pin 2

4. Buzzer

   • Description: Simple piezoelectric buzzer.
   • Pins: PIN, GND

5. LED: Two Pin (white)

   • Description: Standard white LED.
   • Pins: cathode, anode

6. Flame Sensor

   • Description: Sensor to detect flame or fire.
   • Pins: VCC, GND, D0, A0

7. DHT11

   • Description: Temperature and humidity sensor.
   • Pins: DATA, GND, VCC

8. OLED 1.3"

   • Description: 1.3-inch OLED display.
   • Pins: GND, VCC, SCL, SDA

9. Battery 12V

   • Description: 12V battery for power supply.
   • Pins: +, -

10. IR Sensor

    • Description: Infrared sensor for object detection.
    • Pins: out, gnd, vcc

Wiring Details

Arduino UNO

• A4: Connected to SCL of OLED 1.3"
• A5: Connected to SDA of OLED 1.3"
• D12: Connected to out of IR Sensor
• D11: Connected to out of IR Sensor
• D10: Connected to DATA of DHT11
• D9: Connected to D0 of Flame Sensor
• D8: Connected to PIN of Buzzer
• D7: Connected to anode of LED: Two Pin (white)
• D6: Connected to anode of LED: Two Pin (white)
• D5: Connected to IN4 of L298N DC Motor Driver
• D4: Connected to IN3 of L298N DC Motor Driver
• D3: Connected to IN2 of L298N DC Motor Driver
• D2: Connected to IN1 of L298N DC Motor Driver

L298N DC Motor Driver

• OUT1: Connected to pin 1 of DC Motor
• OUT2: Connected to pin 2 of DC Motor
• OUT3: Connected to pin 2 of DC Motor
• OUT4: Connected to pin 1 of DC Motor
• 12V: Connected to + of Battery 12V
• GND: Connected to - of Battery 12V
• 5V: Connected to VCC of IR Sensor, DHT11, OLED 1.3", Flame Sensor

DC Motor

• pin 1: Connected to OUT1 of L298N DC Motor Driver
• pin 2: Connected to OUT2 of L298N DC Motor Driver
• pin 1: Connected to OUT4 of L298N DC Motor Driver
• pin 2: Connected to OUT3 of L298N DC Motor Driver

Buzzer

• PIN: Connected to D8 of Arduino UNO
• GND: Connected to - of Battery 12V

LED: Two Pin (white)

• anode: Connected to D7 of Arduino UNO
• cathode: Connected to - of Battery 12V
• anode: Connected to D6 of Arduino UNO
• cathode: Connected to - of Battery 12V

Flame Sensor

• D0: Connected to D9 of Arduino UNO
• GND: Connected to - of Battery 12V
• VCC: Connected to 5V of L298N DC Motor Driver

DHT11

• DATA: Connected to D10 of Arduino UNO
• GND: Connected to - of Battery 12V
• VCC: Connected to 5V of L298N DC Motor Driver

OLED 1.3"

• GND: Connected to - of Battery 12V
• VCC: Connected to 5V of L298N DC Motor Driver
• SCL: Connected to A4 of Arduino UNO
• SDA: Connected to A5 of Arduino UNO

Battery 12V

• +: Connected to 12V of L298N DC Motor Driver
• -: Connected to GND of L298N DC Motor Driver

IR Sensor

• out: Connected to D12 of Arduino UNO
• gnd: Connected to - of Battery 12V
• vcc: Connected to 5V of L298N DC Motor Driver
• out: Connected to D11 of Arduino UNO
• gnd: Connected to - of Battery 12V
• vcc: Connected to 5V of L298N DC Motor Driver

Code Documentation

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

// OLED display settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DHT11 settings
#define DHTPIN 10
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

// Flame sensor pin
#define FLAME_SENSOR_PIN 9

// Buzzer pin
#define BUZZER_PIN 8

// LED pins
#define LED1_PIN 7
#define LED2_PIN 6

// L298N motor driver pins
#define IN1_PIN 2
#define IN2_PIN 3
#define IN3_PIN 4
#define IN4_PIN 5

// IR sensor pins
#define IR_SENSOR1_PIN 11
#define IR_SENSOR2_PIN 12

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

  // Initialize OLED display
  if (!display.begin(SSD1306_I2C_ADDRESS, OLED_RESET)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  // Initialize DHT11 sensor
  dht.begin();

  // Initialize flame sensor pin
  pinMode(FLAME_SENSOR_PIN, INPUT);

  // Initialize buzzer pin
  pinMode(BUZZER_PIN, OUTPUT);

  // Initialize LED pins
  pinMode(LED1_PIN, OUTPUT);
  pinMode(LED2_PIN, OUTPUT);

  // Initialize motor driver pins
  pinMode(IN1_PIN, OUTPUT);
  pinMode(IN2_PIN, OUTPUT);
  pinMode(IN3_PIN, OUTPUT);
  pinMode(IN4_PIN, OUTPUT);

  // Initialize IR sensor pins
  pinMode(IR_SENSOR1_PIN, INPUT);
  pinMode(IR_SENSOR2_PIN, INPUT);
}

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

  // Read flame sensor data