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Project: Smart Access and Environment Monitoring System

 Smart Access and Environment Monitoring System

Overview:

This project combines light sensing, RFID communication, and user input to build a smart access and environment monitoring system. The system adapts LED brightness to ambient light, identifies users via RFID, and toggles modes using a push button.

Objectives:

  1. Identify users via RFID and display their status in the serial monitor.
  1. Adjust LED brightness dynamically based on ambient light levels.
  1. Use Red Pitaya to analyze I²C signals, light flicker, and button inputs.

Components:

Component
Purpose
Arduino Uno
Microcontroller for system integration.
Red Pitaya STEMlab 125-14
Signal analysis of I²C, light signals, and button inputs.
Seeed Studio Grove NFC Module v1.1
RFID communication and user identification.
Photodiode (BPW34)
Measures ambient light intensity.
Push Button
Toggles modes between manual and automatic.
220 Ω Resistor
Current limiting for the LED.
LED (Red)
Visual output for mode status.
Breadboard and Jumper Wires
For circuit connections.

Steps:

1. Circuit Assembly:

  1. Connect the Photodiode:
      • Anode to Arduino analog input (e.g., A0) with a 10 kΩ pull-up resistor.
      • Cathode to GND.
  1. Connect the RFID Module:
      • VCC to Arduino 5V.
      • GND to Arduino GND.
      • SDA to Arduino A4.
      • SCL to Arduino A5.
  1. Connect the Push Button:
      • One terminal to Arduino digital pin (e.g., pin 2) with a 10 kΩ pull-down resistor.
      • The other terminal to 5V.
  1. Connect the LED:
      • One terminal to Arduino PWM pin (e.g., pin 9) through a 220 Ω resistor.
      • The other terminal to GND.

2. Arduino Programming:

  1. Write a program to integrate all functionalities:
      2. #include <Adafruit_PN532.h>const int photoPin = A0;
const int buttonPin = 2;
const int ledPin = 9;
Adafruit_PN532 nfc(A4, A5);

void setup() {
    pinMode(buttonPin, INPUT);
    pinMode(ledPin, OUTPUT);
    Serial.begin(9600);
    nfc.begin();
}

void loop() {
    // RFID Identification
    uint8_t uid[7];
    uint8_t uidLength;
    if (nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength)) {
        Serial.print("UID: ");
        for (uint8_t i = 0; i < uidLength; i++) {
            Serial.print(uid[i], HEX);
            Serial.print(" ");
        }
        Serial.println();
    }

    // Light Sensing
    int lightLevel = analogRead(photoPin);
    int brightness = map(lightLevel, 0, 1023, 0, 255);
    analogWrite(ledPin, brightness);

    // Button Input
    if (digitalRead(buttonPin)) {
        Serial.println("Button Pressed: Manual Mode");
    } else {
        Serial.println("Automatic Mode");
    }

    delay(200);
}

3. Red Pitaya Signal Analysis:

  1. Photodiode:
      • Monitor light intensity changes and detect flicker.
  1. I²C Signals:
      • Analyze communication between Arduino and RFID module.
  1. Push Button:
      • Visualize the raw and debounced button signal.

Value:

  1. Combines multiple functionalities into a cohesive system.
  1. Demonstrates the use of light sensing, RFID, and user input in a smart application.
  1. Red Pitaya enhances understanding of signal behavior for debugging and optimization.