Circuit Documentation

Summary

This circuit is designed to provide a notification system indicating the presence of individuals in a specific area. It utilizes an ESP32 microcontroller to control LEDs, a buzzer, and an LCD display. The system is integrated with the Blynk platform for remote monitoring and notifications.

Component List

1. Buzzer

   • Pins: PIN, GND
   • Description: Emits sound for notifications.
   • Purpose: Used to alert users with an audible signal.

2. LED: Two Pin (red)

   • Pins: Cathode, Anode
   • Description: Red LED for visual indication.
   • Purpose: Indicates the status of individuals.

3. LED: Two Pin (green)

   • Pins: Cathode, Anode
   • Description: Green LED for visual indication.
   • Purpose: Indicates the status of individuals.

4. ESP32 Devkit V1

   • Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN
   • Description: Microcontroller for controlling the circuit.
   • Purpose: Central control unit for the circuit.

5. 2Pin Push Switch

   • Pins: Input +, Output +
   • Description: Push button switch.
   • Purpose: Used to trigger events in the circuit.

6. 16x2 I2C LCD

   • Pins: GND, VCC, SDA, SCL
   • Description: LCD display for showing messages.
   • Purpose: Displays status messages.

7. Resistor (330 Ohms)

   • Pins: Pin1, Pin2
   • Description: Resistor with 330 Ohms resistance.
   • Purpose: Current limiting for LEDs.

Wiring Details

Buzzer

• PIN connected to ESP32 Devkit V1 pin D25
• GND connected to ESP32 Devkit V1 pin GND

LED: Two Pin (red)

• Anode connected to Resistor pin Pin2
• Cathode connected to ESP32 Devkit V1 pin GND

LED: Two Pin (green)

• Anode connected to Resistor pin Pin2
• Cathode connected to ESP32 Devkit V1 pin GND

ESP32 Devkit V1

• D25 connected to Buzzer pin PIN
• GND connected to Buzzer pin GND
• D5 connected to Resistor pin Pin1
• D18 connected to Resistor pin Pin1
• D19 connected to Resistor pin Pin1
• D21 connected to 16x2 I2C LCD pin SDA
• D22 connected to 16x2 I2C LCD pin SCL
• D23 connected to Resistor pin Pin1
• D26 connected to 2Pin Push Switch pin Input +
• D27 connected to 2Pin Push Switch pin Input +
• VIN connected to 16x2 I2C LCD pin VCC

2Pin Push Switch

• Input + connected to ESP32 Devkit V1 pin D26
• Output + connected to LED: Two Pin (red) pin Cathode

16x2 I2C LCD

• GND connected to ESP32 Devkit V1 pin GND
• VCC connected to ESP32 Devkit V1 pin VIN
• SDA connected to ESP32 Devkit V1 pin D21
• SCL connected to ESP32 Devkit V1 pin D22

Resistor (330 Ohms)

• Pin1 connected to ESP32 Devkit V1 pin D5
• Pin2 connected to LED: Two Pin (red) pin Anode

Resistor (330 Ohms)

• Pin1 connected to ESP32 Devkit V1 pin D18
• Pin2 connected to LED: Two Pin (green) pin Anode

Resistor (330 Ohms)

• Pin1 connected to ESP32 Devkit V1 pin D19
• Pin2 connected to LED: Two Pin (red) pin Anode

Resistor (330 Ohms)

• Pin1 connected to ESP32 Devkit V1 pin D23
• Pin2 connected to LED: Two Pin (green) pin Anode

Documented Code

#define BLYNK_TEMPLATE_ID "TMPL68lOFeQQw"
#define BLYNK_TEMPLATE_NAME "SISTEM NOTIFIKASI KEBERADAAN PENGAJAR DI JABATAN"
#define BLYNK_AUTH_TOKEN "8DoDKWs8kXsOqmrErjOt_xIueKSFkMV0"

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16,2);
#define ledred1   23
#define ledgreen1 19
#define ledred2   18
#define ledgreen2 5
#define buzzer 25

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Zul";
char pass[] = "zul54321";
int pinData;
int param;

BLYNK_WRITE(V0)
{
  int pinValue = param.asInt();
  if(pinValue == 0){
    lcd.setCursor(0,0);
    lcd.print("AZMAN   - TIADA ");
    digitalWrite(ledred1,HIGH);
    digitalWrite(ledgreen1,LOW);
  }
  else if(pinValue == 1){
    lcd.setCursor(0,0);
    lcd.print("AZMAN   - ADA  ");
    digitalWrite(ledred1,LOW);
    digitalWrite(ledgreen1,HIGH);
  }
  else if(pinValue == 2){
    digitalWrite(buzzer,HIGH);
    lcd.setCursor(0,0);
    lcd.print("AZMAN  - MASUK   ");
    delay(3000);
    digitalWrite(buzzer,LOW);
  }
  else if(pinValue == 3){
    digitalWrite(buzzer,HIGH);
    lcd.setCursor(0,0);
    lcd.print("AZMAN  - SIBUK  ");
    delay(3000);
    digitalWrite(buzzer,LOW);
  }
}
BLYNK_WRITE(V1)
{
  int pinValue = param.asInt();
  if(pinValue == 0){
    lcd.setCursor(0,1);
    lcd.print("SHAKIRAH - TIADA  ");
    digitalWrite(ledred2,HIGH);
    digitalWrite(ledgreen2,LOW);
  }
  else if(pinValue == 1){
    lcd.setCursor(0,1);
    lcd.print("SHAKIRAH - ADA  ");
    digitalWrite(ledred2,LOW);
    digitalWrite(ledgreen2,HIGH);
  }
  else if(pinValue == 2){
    digitalWrite(buzzer,HIGH);
    lcd.setCursor(0,1);
    lcd.print("SHAKIRAH - MASUK   ");
    delay(3000);
    digitalWrite(buzzer,LOW);
  }
  else if(pinValue == 3){
    digitalWrite(buzzer,HIGH);
    lcd.setCursor(0,1);
    lcd.print("SHAKIRAH - SIBUK  ");
    delay(3000);
    digitalWrite(buzzer,LOW);
  }
}
void setup()
{
    Serial.begin(9600);
    Blynk.begin(auth, ssid, pass);
    pinMode(26,INPUT_PULLUP);
    pinMode(27,INPUT_PULLUP);
    pinMode(ledred1,OUTPUT);
    pinMode(ledgreen1,OUTPUT);
    pinMode(ledred2,OUTPUT);
    pinMode(ledgreen2,OUTPUT);
    pinMode(buzzer,OUTPUT);
    lcd.begin();
    lcd.backlight();
    lcd.setCursor(0,0);
    lcd.print("AZMAN   - TIADA");
    lcd.setCursor(0,1);
    lcd.print("SHAKIRAH - TIADA");
    digitalWrite(buzzer,LOW);
    digitalWrite(ledred1,HIGH);
    digitalWrite(ledgreen1,LOW);
    digitalWrite(ledred2,HIGH);
    digitalWrite(ledgreen2,LOW);
}

void loop()
{
   Blynk.run();
   Blynk.syncVirtual(V0);