Circuit Documentation

Summary

This circuit is designed to monitor environmental conditions and control various devices based on sensor inputs. It includes an Arduino UNO microcontroller, a DHT11 temperature and humidity sensor, an LDR module, a 12V single-channel relay, a DC motor, a servo motor, a 4x4 keypad, an ultrasonic sensor, a 16x2 I2C LCD, a Bluetooth HC-06 module, and a four-pin LED. The Arduino UNO reads data from the sensors and controls the relay, motor, servo, and LED based on the sensor inputs.

Component List

Arduino UNO

• Description: A 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

DC Motor

• Description: A simple DC motor.
• Pins: pin 1, pin 2

Module LDR

• Description: A light-dependent resistor module.
• Pins: VCC, GND, DO, AO

12V Single Channel Relay

• Description: A relay module for controlling high voltage devices.
• Pins: NC, COM, NO, IN, GND, VCC

Servo

• Description: A servo motor.
• Pins: GND, VCC, PWM

DHT11

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

LED: Four Pin

• Description: A four-pin LED with red, green, and blue cathodes and a common anode.
• Pins: red cathode, common anode, green cathode, blue cathode

Bluetooth HC-06

• Description: A Bluetooth module for wireless communication.
• Pins: VCC, GND, TXD, RXD

Resistor

• Description: A resistor with a resistance of 200 Ohms.
• Pins: pin1, pin2

Ultrasonic Sensor

• Description: An ultrasonic sensor for distance measurement.
• Pins: +VCC, Trigger, Echo, GND

4x4 Keypad (Simulator)

• Description: A 4x4 matrix keypad.
• Pins: R1, C4, R2, C2, R3, R4, C1, C3

16x2 I2C LCD

• Description: A 16x2 character LCD with I2C interface.
• Pins: GND, VCC, SDA, SCL

Wiring Details

Arduino UNO

• 5V: Connected to VCC of Module LDR, 12V Single Channel Relay, Servo, Bluetooth HC-06, 16x2 I2C LCD, Ultrasonic Sensor, and DHT11.
• GND: Connected to GND of Module LDR, 12V Single Channel Relay, Servo, Bluetooth HC-06, 16x2 I2C LCD, Ultrasonic Sensor, and DHT11.
• A0: Connected to AO of Module LDR.
• A1: Connected to R4 of 4x4 Keypad.
• A2: Connected to C1 of 4x4 Keypad.
• A3: Connected to C2 of 4x4 Keypad.
• A4: Connected to SDA of 16x2 I2C LCD.
• A5: Connected to SCL of 16x2 I2C LCD.
• D13: Connected to pin2 of Resistor.
• D12: Connected to DATA of DHT11.
• D11: Connected to R1 of 4x4 Keypad.
• D10: Connected to R2 of 4x4 Keypad.
• D9: Connected to R3 of 4x4 Keypad.
• D8: Connected to C3 of 4x4 Keypad.
• D7: Connected to IN of 12V Single Channel Relay.
• D6: Connected to Trigger of Ultrasonic Sensor.
• D5: Connected to Echo of Ultrasonic Sensor.
• D4: Connected to GND of Servo.
• D3: Connected to RXD of Bluetooth HC-06.
• D2: Connected to TXD of Bluetooth HC-06.

DC Motor

• pin 1: Connected to NO of 12V Single Channel Relay.
• pin 2: Connected to COM of 12V Single Channel Relay.

Module LDR

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• AO: Connected to A0 of Arduino UNO.

12V Single Channel Relay

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• IN: Connected to D7 of Arduino UNO.
• NO: Connected to pin 1 of DC Motor.
• COM: Connected to pin 2 of DC Motor.

Servo

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• PWM: Connected to PWM of Servo.

DHT11

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• DATA: Connected to D12 of Arduino UNO.

LED: Four Pin

• green cathode: Connected to 5V of Arduino UNO.
• red cathode: Connected to pin1 of Resistor.

Bluetooth HC-06

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• TXD: Connected to D2 of Arduino UNO.
• RXD: Connected to D3 of Arduino UNO.

Resistor

• pin1: Connected to red cathode of LED: Four Pin.
• pin2: Connected to D13 of Arduino UNO.

Ultrasonic Sensor

• +VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• Trigger: Connected to D6 of Arduino UNO.
• Echo: Connected to D5 of Arduino UNO.

4x4 Keypad (Simulator)

• R1: Connected to D11 of Arduino UNO.
• R2: Connected to D10 of Arduino UNO.
• R3: Connected to D9 of Arduino UNO.
• R4: Connected to A1 of Arduino UNO.
• C1: Connected to A2 of Arduino UNO.
• C2: Connected to A3 of Arduino UNO.
• C3: Connected to D8 of Arduino UNO.

16x2 I2C LCD

• VCC: Connected to 5V of Arduino UNO.
• GND: Connected to GND of Arduino UNO.
• SDA: Connected to A4 of Arduino UNO.
• SCL: Connected to A5 of Arduino UNO.

Documented Code

#include <DHT.h>

// Định nghĩa chân cảm biến và thiết bị
#define PIRPIN 5         // Chân kết nối PIR
#define DHTPIN 12        // Chân dữ liệu DHT
#define DHTTYPE DHT11    // Loại cảm biến DHT11
#define relayPin 8       // Chân điều khiển relay (quạt)
const int ldrPin = A0;   // Chân kết nối LDR
const int redPin = 9;    // Chân LED đỏ
const int greenPin = 10; // Chân LED xanh lá
const int bluePin = 11;  // Chân LED xanh dương

DHT dht(DHTPIN, DHTTYPE);  // Khởi tạo đối tượng DHT
float temperatureThreshold = 30.0;  // Ngưỡng nhiệt độ

void setup() {
  // Cài đặt các chân
  pinMode(PIRPIN, INPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  
  Serial.begin(9600);  // Khởi động Serial Monitor
  dht.begin();         // Khởi tạo DHT
}

void loop() {
  // Kiểm tra PIR
  int pirState = digitalRead(PIRPIN);
  if (pirState == HIGH) {  // Phát hiện chuyển động
    Serial.println("Phát hiện người! Hoạt động các cảm biến.");

    // Hoạt