Circuit Documentation

Summary

This circuit is designed around the ESP-8266 microcontroller, which serves as the central processing unit. The circuit includes a variety of peripherals including an OLED display, a piezo buzzer, an RGB LED, a fingerprint scanner, a solenoid, and a voice recognition module. The ESP-8266 manages sensor data, controls actuators, and communicates with external devices. The circuit is likely intended for a security or access control system, where user authentication via fingerprint triggers a solenoid lock and provides visual and audible feedback.

Component List

ESP-8266 Controller

• Microcontroller with WiFi capability.
• Interfaces with various sensors and actuators.
• Manages data communication and processing.

Solenoid

• Electromechanical device used to control a mechanism or system, such as a lock.

Piezo Buzzer

• An electronic device that emits sound when an electric current is applied.

RGB LED (Wokwi compatible)

• A light-emitting diode that can display multiple colors through the combination of red, green, and blue diodes.

Fingerprint Scanner

• Biometric sensor for identifying users by their fingerprints.

OLED Display 2.42"

• A small screen that displays information, likely used for user feedback or status display.

DF Robot Gravity Voice Recognition Module

• A module that can recognize voice commands for hands-free control.

Wiring Details

ESP-8266 Controller

• D2 connected to OLED Display (SDA)
• D3 connected to OLED Display (RES)
• D4 connected to Piezo Buzzer and OLED Display (DC)
• D5 connected to Solenoid
• D6 connected to RGB LED (R)
• D7 connected to RGB LED (G) and Piezo Buzzer
• D8 connected to RGB LED (B)
• RX connected to Fingerprint Scanner (TX) and Voice Recognition Module (D/T)
• TX connected to Fingerprint Scanner (RX) and Voice Recognition Module (C/R)
• 3V3 connected to Fingerprint Scanner (VCC), OLED Display (VCC), Solenoid, and Voice Recognition Module (VCC)
• GND connected to RGB LED (COM), Piezo Buzzer, Fingerprint Scanner (GND), OLED Display (GND), Solenoid, and Voice Recognition Module (GND)

Solenoid

• pin1 connected to ESP-8266 Controller (GND)
• pin2 connected to ESP-8266 Controller (3V3)

Piezo Buzzer

• pin 1 connected to ESP-8266 Controller (D4)
• pin 2 connected to ESP-8266 Controller (GND)

RGB LED (Wokwi compatible)

• R connected to ESP-8266 Controller (D6)
• COM connected to ESP-8266 Controller (GND)
• G connected to ESP-8266 Controller (D7)
• B connected to ESP-8266 Controller (D8)

Fingerprint Scanner

• TX connected to ESP-8266 Controller (RX)
• RX connected to ESP-8266 Controller (TX)
• GND connected to ESP-8266 Controller (GND)
• VCC connected to ESP-8266 Controller (3V3)

OLED Display 2.42"

• GND connected to ESP-8266 Controller (GND)
• VCC connected to ESP-8266 Controller (3V3)
• SCK connected to ESP-8266 Controller (D5)
• SDA connected to ESP-8266 Controller (D2)
• RES connected to ESP-8266 Controller (D3)
• DC connected to ESP-8266 Controller (D4)
• CS connected to ESP-8266 Controller (D8)

DF Robot Gravity Voice Recognition Module

• D/T connected to ESP-8266 Controller (RX)
• C/R connected to ESP-8266 Controller (TX)
• GND connected to ESP-8266 Controller (GND)
• VCC connected to ESP-8266 Controller (3V3)

Documented Code

#include <DHT.h>
#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <FirebaseESP8266.h>

// WiFi Configuration
#define WIFI_SSID "your_SSID"
#define WIFI_PASSWORD "your_PASSWORD"

// Firebase Configuration
#define FIREBASE_HOST "your_firebase_database.firebaseio.com"
#define FIREBASE_AUTH "your_firebase_database_secret"

#define DHTPIN D8        // Pin for DHT sensor
#define DHTTYPE DHT11    // DHT sensor type
DHT dht(DHTPIN, DHTTYPE);

SoftwareSerial mySerial(D2, D3); // RX, TX for fingerprint
FirebaseData firebaseData;

// Pins for components
const int solenoidPin = D5;
const int fingerprintTxPin = D2;
const int fingerprintRxPin = D3;
const int buzzerPin = D7;
const int pushButtonPin = D4;
const int ledRedPin = D9;
const int ledGreenPin = D10;
const int ledBluePin = D11;

// Variables for control
bool isRewardGranted = false;

// Setup function
void setup() {
  Serial.begin(115200);
  mySerial.begin(57600); // Communication speed for fingerprint
  pinMode(solenoidPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(pushButtonPin, INPUT_PULLUP);
  pinMode(ledRedPin, OUTPUT);
  pinMode(ledGreenPin, OUTPUT);
  pinMode(ledBluePin, OUTPUT);

  dht.begin();

  // Connect to WiFi
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");

  // Connect to Firebase
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
}

// Loop function
void loop() {
  // Check temperature and humidity
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Send data to Firebase
  Firebase.setFloat(firebaseData, "/temperature", temperature);
  Firebase.setFloat(firebaseData, "/humidity", humidity);

  // Check push button status
  if (digitalRead(pushButtonPin) == LOW) {
    // If button is pressed, perform fingerprint verification
    if (verifyFingerprint()) {
      if (!isRewardGranted) {
        grantReward();
      }
    }
    delay(500); // Debounce delay
  }

  // Check reward condition
  if (isRewardGranted) {
    // Turn off solenoid after 10 seconds
    delay(10000);
    digitalWrite(solenoidPin, LOW);
    isRewardGranted = false;
  }
}

// Function to verify fingerprint
bool verifyFingerprint() {
  // Implement code for fingerprint verification
  return true; // Replace with fingerprint verification logic
}

// Function to grant reward
void grantReward() {
  digitalWrite(solenoidPin, HIGH);
  tone(buzzerPin, 1000, 500); // Sound buzzer
  isRewardGranted = true;

  // Light up RGB LED as an indicator
  digitalWrite(ledRedPin, HIGH);
  delay(500);
  digitalWrite(ledRedPin, LOW);
  digitalWrite(ledGreenPin, HIGH);
  delay(500);
  digitalWrite(ledGreenPin, LOW);
  digitalWrite(ledBluePin, HIGH);
  delay(500);
  digitalWrite(ledBluePin, LOW);
}

Note: The code provided is a basic template and requires further implementation for the fingerprint verification process. Additionally, the pin definitions for the RGB LED in the code do not match the wiring details provided. The correct pin assignments should be used in the final implementation.