"Potentiometer MQTT" rev_02

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    - Project: "Potentiometer MQTT"
    - Source Code compiled for: ESP32 DevKit V1
    - Source Code created on: 2024-09-14 18:15:54

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Connect the ESP32 DEv board to an Home Assistant */
    /* MQTT Broker. Makte the Potentiometer available for */
    /* the MQTT Server to control it from Home Assitant */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <WiFi.h> // Include the WiFi library for ESP32
#include <PubSubClient.h> // Include the PubSubClient library for MQTT

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t Potentiometer_Potentiometer_Vout_PIN_D4 = 4; // Use pin number 4 instead of D4

// WiFi credentials
const char* ssid = "Your_SSID"; // Replace with your WiFi SSID
const char* password = "Your_PASSWORD"; // Replace with your WiFi password

// MQTT Broker details
const char* mqtt_server = "broker.hivemq.com"; // Replace with your MQTT broker address
const char* mqtt_topic = "home/potentiometer"; // Topic to publish the potentiometer value

WiFiClient espClient; // Create a WiFi client
PubSubClient client(espClient); // Create a PubSubClient object

void setup(void)
{
    // Start the Serial communication
    Serial.begin(115200);
    pinMode(Potentiometer_Potentiometer_Vout_PIN_D4, INPUT); // Set the potentiometer pin as input

    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print("."); // Print dots while connecting
    }
    Serial.println("Connected to WiFi");

    // Set the MQTT server
    client.setServer(mqtt_server, 1883); // Set the MQTT server and port
}

void loop(void)
{
    // Reconnect to MQTT if not connected
    if (!client.connected()) {
        while (!client.connected()) {
            Serial.print("Attempting MQTT connection...");
            // Attempt to connect
            if (client.connect("ESP32Client")) {
                Serial.println("connected");
            } else {
                Serial.print("failed, rc=");
                Serial.print(client.state());
                Serial.println(" try again in 5 seconds");
                delay(5000); // Wait 5 seconds before retrying
            }
        }
    }
    client.loop(); // Maintain the MQTT connection

    // Read the potentiometer value
    int potValue = analogRead(Potentiometer_Potentiometer_Vout_PIN_D4);
    // Convert the potentiometer value to a string
    String potValueStr = String(potValue);
    // Publish the potentiometer value to the MQTT topic
    client.publish(mqtt_topic, potValueStr.c_str());
    Serial.print("Potentiometer Value: ");
    Serial.println(potValueStr); // Print the value to the Serial monitor

    delay(2000); // Wait for 2 seconds before the next reading
}

/* END CODE */