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Arduino Nano-Based Smart Temperature Control System with DHT11 and Servo

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Circuit Documentation

Summary

This circuit is designed to monitor temperature using a DHT11 sensor and control a DC motor and LEDs based on the temperature readings. The circuit also includes a 16x2 I2C LCD for displaying information, a servo motor, and a two-channel relay for controlling a humidifier and the DC motor. The Arduino Nano microcontroller is used to manage the entire system.

Component List

  1. Arduino Nano

    • Description: Microcontroller board based on the ATmega328P.
    • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

  2. DC Motor

    • Description: A motor that runs on DC power.
    • Pins: pin 1, pin 2

  3. Resistor (1k Ohms)

    • Description: Resistor with a resistance of 1000 Ohms.
    • Pins: pin1, pin2

  4. Servo (Wokwi Compatible)

    • Description: Servo motor compatible with Wokwi.
    • Pins: GND, V+, PWM

  5. LED: Two Pin (red)

    • Description: Red LED with two pins.
    • Pins: cathode, anode

  6. LED: Two Pin (green)

    • Description: Green LED with two pins.
    • Pins: cathode, anode

  7. DHT 11

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

  8. 16x2 I2C LCD

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

  9. Two Channel Relay 5v

    • Description: Relay module with two channels, operates at 5V.
    • Pins: VCC, IN2, IN1, GND, NC2, C2, NO2, NC1, C1, NO1

  10. 12v Power Supply

    • Description: Power supply providing 12V.
    • Pins: +, -

  11. Humidifier

    • Description: Device to add moisture to the air.
    • Pins: GND, 5V

Wiring Details

Arduino Nano

DC Motor

Resistor (1k Ohms)

Servo (Wokwi Compatible)

LED: Two Pin (red)

LED: Two Pin (green)

DHT 11

16x2 I2C LCD

Two Channel Relay 5v

12v Power Supply

Humidifier

Documented Code

#include <DHT.h>
#define DHT11PIN 4
#define ledHijau 2
#define ledMerah 3
#define kipas 5

DHT dht11(DHT11PIN, DHT11);

float suhu;
float suhuNormal = 0;

void setup() {
  Serial.begin(9600);
  dht11.begin();
  //set DHT11 sebagai input
  pinMode(DHT11PIN, INPUT);

  // set led sebagai output
  pinMode(ledHijau, OUTPUT);
  pinMode(ledMerah, OUTPUT);

  //set kipas sebagai output
  pinMode(kipas, OUTPUT);

  //Set kondisi awal led dalam keadaan mati
  digitalWrite(ledHijau, LOW);
  digitalWrite(ledMerah, LOW);

  //Set kondisi awal motor dalam keadaan mati
  digitalWrite(kipas, LOW);
}

void loop() {
  suhuNormal = 40;
  suhu = dht11.readTemperature();
  Serial.print("Suhu sekarang: ");
  Serial.print(suhu);
  Serial.println(" °C");
  if (suhu>=20 && suhu<=suhuNormal){
    digitalWrite(ledHijau, HIGH);
    digitalWrite(ledMerah, LOW);
    digitalWrite(kipas, HIGH);
    Serial.println("Suhu panas, kipas angin hidup");
  }

  //suhu kurang dari 20 dan lebih dari 15
  else if (suhu<20){
    digitalWrite(ledHijau, LOW);
    digitalWrite(ledMerah, HIGH);
    digitalWrite(kipas, LOW);
    Serial.println("Suhu dingin, kipas angin mati");
  }

  delay(500);
}

This code initializes the DHT11 sensor, LEDs, and the DC motor (referred to as "kipas" in the code). It reads the temperature from the DHT11 sensor and controls the LEDs and the motor based on the temperature readings. The green LED and the motor are turned on if the temperature is between 20°C and 40°C, while the