Circuit Documentation

Summary

This circuit is designed to monitor power usage, water flow, and display the data on an LCD. It consists of an Arduino UNO, an ESP32, a PZEM004t power monitoring module, a 16x2 I2C LCD, a water flow sensor, and a piezo buzzer. The ESP32 is used for WiFi connectivity and MQTT communication, while the Arduino UNO handles the main control logic and interfaces with the sensors and display.

Component List

1. PZEM004t

   • Description: Power monitoring module
   • Pins: VCC, RX, TX, GND, IN, OUT

2. Arduino UNO

   • Description: Microcontroller board
   • 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

3. ESP32

   • Description: WiFi and Bluetooth microcontroller
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

4. Piezo Buzzer

   • Description: Sound-producing device
   • Pins: pin 1, pin 2

5. 16x2 I2C LCD

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

6. Water Flow Sensor

   • Description: Sensor to measure water flow rate
   • Pins: Signal, Vcc, GND

Wiring Details

PZEM004t

• OUT connected to:

  • ESP32 VIN
  • 16x2 I2C LCD VCC
  • Water Flow Sensor Vcc
  • Arduino UNO 5V

• IN connected to:

  • Arduino UNO D13
  • Arduino UNO D12

Arduino UNO

• 5V connected to:

  • PZEM004t OUT
  • ESP32 VIN
  • 16x2 I2C LCD VCC
  • Water Flow Sensor Vcc

• GND connected to:

  • ESP32 D23
  • 16x2 I2C LCD GND
  • Water Flow Sensor GND
  • Piezo Buzzer pin 1

• A4 connected to:

  • 16x2 I2C LCD SDA

• A5 connected to:

  • 16x2 I2C LCD SCL

• D13 connected to:

  • PZEM004t IN

• D12 connected to:

  • PZEM004t IN

• D8 connected to:

  • Piezo Buzzer pin 2

• D2 connected to:

  • Water Flow Sensor Signal

• D1 connected to:

  • ESP32 D21

• D0 connected to:

  • ESP32 RX0

ESP32

• VIN connected to:

  • PZEM004t OUT
  • 16x2 I2C LCD VCC
  • Water Flow Sensor Vcc
  • Arduino UNO 5V

• D23 connected to:

  • Arduino UNO GND

• D21 connected to:

  • Arduino UNO D1

• RX0 connected to:

  • Arduino UNO D0

Piezo Buzzer

• pin 1 connected to:

  • Arduino UNO GND

• pin 2 connected to:

  • Arduino UNO D8

16x2 I2C LCD

• VCC connected to:

  • PZEM004t OUT
  • ESP32 VIN
  • Water Flow Sensor Vcc
  • Arduino UNO 5V

• GND connected to:

  • ESP32 D23
  • Water Flow Sensor GND
  • Piezo Buzzer pin 1
  • Arduino UNO GND

• SDA connected to:

  • Arduino UNO A4

• SCL connected to:

  • Arduino UNO A5

Water Flow Sensor

• Vcc connected to:

  • PZEM004t OUT
  • ESP32 VIN
  • 16x2 I2C LCD VCC
  • Arduino UNO 5V

• GND connected to:

  • ESP32 D23
  • 16x2 I2C LCD GND
  • Piezo Buzzer pin 1
  • Arduino UNO GND

• Signal connected to:

  • Arduino UNO D2

Documented Code

PZEM004t Code (Arduino UNO)

#include <PZEM004Tv30.h>

PZEM004Tv30 pzem(Serial2); // Hubungkan ke port Serial2 (ESP32)

void setup() {
  Serial.begin(9600);
  Serial.println("Monitoring Power Usage");
}

void loop() {
  float voltage = pzem.voltage();
  float current = pzem.current();
  float power = pzem.power();

  Serial.print("Voltage: "); Serial.println(voltage);
  Serial.print("Current: "); Serial.println(current);
  Serial.print("Power: "); Serial.println(power);

  delay(2000);
}

Arduino UNO Code

#include <LiquidCrystal.h>

// Inisialisasi pin untuk LCD
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

// Pin sensor dan relay
const int flowSensorPin = 8;
const int relayPin = 9;
const int buzzerPin = 10;

volatile int pulseCount = 0;
float flowRate;
float totalLiters = 0;

// Waktu sampling
unsigned long oldTime = 0;

void setup() {
  // Konfigurasi pin
  pinMode(flowSensorPin, INPUT_PULLUP);
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  // Konfigurasi LCD
  lcd.begin(16, 2);
  lcd.print("Monitoring...");

  // Interrupt untuk sensor aliran
  attachInterrupt(digitalPinToInterrupt(flowSensorPin), pulseCounter, FALLING);

  Serial.begin(9600);
}

void loop() {
  if (millis() - oldTime > 1000) { // Update setiap 1 detik
    detachInterrupt(digitalPinToInterrupt(flowSensorPin));

    // Hitung flow rate dan total liter
    flowRate = (pulseCount / 7.5); // Flow rate dalam liter per menit
    totalLiters += (flowRate / 60); // Total liter
    pulseCount = 0;

    // Tampilkan di LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Flow: ");
    lcd.print(flowRate);
    lcd.print(" L/min");
    lcd.setCursor(0, 1);
    lcd.print("Total: ");
    lcd.print(totalLiters);
    lcd.print(" L");

    // Kirim data melalui serial
    Serial.print("Flow Rate: ");
    Serial.print(flowRate);
    Serial.println(" L/min");
    Serial.print("Total Usage: ");
    Serial.print(totalLiters);
    Serial.println(" L");

    // Aktifkan relay jika batas tercapai
    if (totalLiters > 100) {
      digitalWrite(relayPin, HIGH); // Matikan relay
      digitalWrite(buzzerPin, HIGH); // Aktifkan buzzer
      delay(1000);
      digitalWrite(buzzerPin, LOW);
    } else {
      digitalWrite(relayPin, LOW);
    }

    oldTime = millis();
    attachInterrupt(digitalPinToInterrupt(flowSensorPin), pulseCounter, FALLING);
  }
}

// Fungsi interrupt
void pulseCounter() {
  pulseCount++;
}

ESP32 Code

#include <WiFi.h>
#include <PubSubClient.h>

const char* ssid = "YourWiFiSSID";
const char* password = "YourWiFiPassword";
const char* mqttServer = "mqtt.example.com";
const int mqttPort = 1883;
const char* mqttUser = "yourMQTTUser";
const char* mqttPassword = "yourMQTTPassword";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  client.setServer(mqttServer, mqttPort);

  while (!client.connected()) {
    Serial.println("