Cirkit Designer LogoCirkit DesignerYour all-in-one circuit design IDE Launch Cirkit Designer App

Arduino and ESP8266-Based Smart Warehouse Monitoring System with RFID and Wi-Fi Connectivity

View and Edit Project In Cirkit DesignerImage of Arduino and ESP8266-Based Smart Warehouse Monitoring System with RFID and Wi-Fi Connectivity

Circuit Documentation

Summary

This circuit integrates an Arduino UNO and an ESP8266 NodeMCU to monitor environmental conditions using various sensors and control devices. The Arduino UNO reads data from a DHT11 temperature and humidity sensor, an HC-SR04 ultrasonic sensor, a water level sensor, and an RFID-RC522 module. It also controls a buzzer and two LEDs (red and blue). The ESP8266 NodeMCU connects to a Firebase database to upload sensor data and receive control signals.

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. ESP8266 NodeMCU

    • Description: Wi-Fi module with integrated TCP/IP protocol stack.
    • Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

  3. DHT11

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

  4. HC-SR04 Ultrasonic Sensor

    • Description: Ultrasonic distance sensor.
    • Pins: VCC, TRIG, ECHO, GND

  5. Water Level Sensor

    • Description: Analog water level sensor.
    • Pins: SIG, VCC, GND

  6. RFID-RC522

    • Description: RFID reader module.
    • Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA

  7. Buzzer

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

  8. LED: Two Pin (red)

    • Description: Red LED.
    • Pins: cathode, anode

  9. LED: Two Pin (blue)

    • Description: Blue LED.
    • Pins: cathode, anode

  10. Resistor (220 Ohms)

    • Description: Resistor with 220 Ohms resistance.
    • Pins: pin1, pin2

Wiring Details

Arduino UNO

ESP8266 NodeMCU

DHT11

HC-SR04 Ultrasonic Sensor

Water Level Sensor

RFID-RC522

Buzzer

LED: Two Pin (red)

LED: Two Pin (blue)

Resistor (220 Ohms)

Documented Code

Arduino UNO Code

#include <DHT.h>  // Include the DHT sensor library
#include <SPI.h>
#include <MFRC522.h>

// Define pin numbers for the sensors and RFID
const int redSignalPin = 5;    // Red signal (buzzer and red led) connected to pin 5
const int trigPin = 4;         // Trigger pin of ultrasonic sensor
const int echoPin = 3;         // Echo pin of ultrasonic sensor
const int waterLevelPin = A0;  // Water level sensor connected to analog pin A0
const int dhtPin = 2;          // DHT11 data pin connected to digital pin 2
const int blueSignalPin = 6;   // Blue signal (blue LED) connected to pin 6

#define RST_PIN 9          // RFID RST pin
#define SS_PIN 10          // RFID SDA (SS) pin

// DHT11 sensor setup
#define DHTTYPE DHT11
DHT dht(dhtPin, DHTTYPE);

// RFID setup
MFRC522 mfrc522(SS_PIN, RST_PIN);

// Threshold values
const int distanceThreshold = 20;    // Trigger distance for ultrasonic sensor in cm
const int waterLevelThreshold = 100; // Analog value threshold for water level sensor (flood detection)

// State variables
bool signalSystemEnabledCloud = true; // Tracks if the ultrasonic signaling system is active
bool signalSystemEnabledLocal = true; // Tracks if the ultrasonic signaling system is active

void setup() {
  // Start serial communication
  Serial.begin(115200);
  // Initialize sensors and modules
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(redSignalPin, OUTPUT);
  pinMode(blueSignalPin, OUTPUT);
  dht.begin();
  SPI.begin();
  mfrc522.PCD_Init();

  // Initialize red and blue signals as off
  digitalWrite(redSignalPin, LOW);
  digitalWrite(blueSignalPin, LOW);
  Serial.println("System Ready. Place your RFID card to toggle ultrasonic signaling system.");
}

void loop() {
  // Ultrasonic signaling (only when enabled)
  if (signalSystemEnabledCloud && signalSystemEnabledLocal) {
    float distance = readUltrasonicSensor();
    if (distance <= distanceThreshold) {
      digitalWrite(redSignalPin, HIGH); // Turn on red signal (buzzer)
      delay(500);                       // Signal duration
      digitalWrite(redSignalPin, LOW);  // Turn off red signal (buzzer)
    }
  }

  // Water level signaling (always active)
  int waterLevel = analogRead(waterLevelPin);
  if (waterLevel >= waterLevelThreshold) {
    digitalWrite(blueSignalPin, HIGH);  // Turn on blue signal (LED)
  } else {
    digitalWrite(blue