Developing a Smart Home Energy Monitor with ESP32-C5

Circuit Connection

1. Connect the Current Sensor:

• Connect the output of the current sensor to an analog pin on the ESP32-C5.
• Connect the power and ground pins of the current sensor to the corresponding pins on the ESP32-C5.

2. Connect the Voltage Sensor:

• Connect the output of the voltage sensor to an analog pin on the ESP32-C5.
• Connect the power and ground pins of the voltage sensor to the corresponding pins on the ESP32-C5.

3. Connect the OLED Display (Optional):

• Connect the SDA and SCL pins of the OLED display to the corresponding pins on the ESP32-C5.
• Connect the power and ground pins of the OLED display to the corresponding pins on the ESP32-C5.

4. Programming:

Write a program in Arduino IDE using the ESP32 board support package. Utilize libraries for the OLED display, MQTT communication, and sensor readings.

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

#include <PubSubClient.h>

#include <WiFi.h>

// Define Wi-Fi and MQTT parameters

const char* ssid = "your_SSID";

const char* password = "your_PASSWORD";

const char* mqtt_server = "your_MQTT_BROKER_IP";

// Define OLED display parameters

#define SCREEN_WIDTH 128

#define SCREEN_HEIGHT 64

#define OLED_RESET -1

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Define current and voltage sensor pins

const int currentSensorPin = A0;

const int voltageSensorPin = A1;

// MQTT Client

WiFiClient espClient;

PubSubClient client(espClient);

void setup() {

// Initialize OLED display

if(!display.begin(SSD1306_I2C, 0x3C)) {

Serial.println(F("SSD1306 allocation failed"));

for(;;);

}

// Connect to Wi-Fi

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(250);

Serial.print(".");

}

Serial.println("WiFi connected");

// Connect to MQTT Broker

client.setServer(mqtt_server, 1883);

}

void loop() {

// Read current and voltage values

float current = analogRead(currentSensorPin) * (5.0 / 1023.0);

float voltage = analogRead(voltageSensorPin) * (5.0 / 1023.0) * 230.0;

// Calculate power consumption

float power = current * voltage;

// Display readings on OLED (optional)

display.clearDisplay();

display.setTextSize(1);

display.setCursor(0, 0);

display.print("Power: ");

display.print(power, 2);

display.print(" W");

display.display();

// Publish readings to MQTT Broker

if (client.connected()) {

client.publish("home/power", String(power).c_str());

}

delay(1000); // Adjust delay as needed

}

Optional Features:

• Implement deep sleep mode to conserve energy.
• Add multiple sensors for monitoring different areas.
• Integrate the energy monitor with a cloud platform for remote monitoring.

Conclusion

The microcontrollers serve as Internet communication devices for builders, yet the ESP32 stands out. Developing a Smart Home Energy Monitor with the ESP32-C5 provides an efficient solution for homeowners to monitor and optimize their energy consumption. This project showcases the capabilities of the ESP32-C5 in IoT applications and can serve as a foundation for expanding into more complex smart home projects.