Data Acquisition and MQTT Transmission using ESP32

10.12.2024 - Engine: Gemini

Data Acquisition and MQTT Transmission with ESP32

Components:

• ESP32 microcontroller
• Sensors (e.g., temperature, humidity, light sensors)
• MQTT broker (e.g., Mosquitto)

Steps:

1. Connect Sensors: Connect the sensors to the ESP32 via GPIO pins.
2. Read Sensor Data: Write code to read sensor data in real time.
3. Set up MQTT Client: Instantiate an MQTT client on the ESP32 and connect it to the broker.
4. Transmit Data: Send collected sensor data as MQTT messages to a specified topic.
5. Subscribers Receive Data: Subscribers can retrieve and use the data via MQTT subscription.

Use Cases:

• Remote Monitoring: Monitor environmental parameters such as temperature, humidity, and air quality in real time.
• Home Automation: Control devices like lights, blinds, and thermostats based on sensor input.
• Industrial Automation: Monitor and control manufacturing processes, quality control, and predictive maintenance.
• Health and Fitness Tracking: Capture vital data such as heart rate, blood oxygen saturation, and sleep quality.
• Agriculture: Monitor soil moisture, temperature, and light intensity to optimize crop yields.

Code Example:

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

const char* ssid = "MY_SSID";
const char* password = "MY_PASSWORD";
const char* mqtt_server = "mqtt.example.com";
const int mqtt_port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  // Initialize Wi-Fi and MQTT client
  ...

  // Initialize sensors
  ...
}

void loop() {
  // Read sensor data
  ...

  // Compose MQTT message
  String message = "...";

  // Publish message
  client.publish("my/topic", message.c_str());
}