# Sensor Logger rev_03

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    - Project: # Sensor Logger
    - Source Code NOT compiled for: Arduino Nano
    - Source Code created on: 2026-01-13 08:51:25

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Establezca una conexión WiFi usando la biblioteca */
    /* WiFiEspAT en Arduino Nano y realice solicitudes de */
    /* cliente HTTP para transmitir datos al servicio en */
    /* la nube de Excel usando ArduinoHttpClient. */
/****** END SYSTEM REQUIREMENTS *****/



/****** DEFINITION OF LIBRARIES *****/
// Compatible with Arduino Nano using
// ESP8266/ESP32 as WiFi module
#include <WiFiEspAT.h>

// Compatible with Arduino Nano for HTTP requests
#include <ArduinoHttpClient.h>

/****** DEFINITION OF CONSTANTS *****/
// WiFi credentials
const char* ssid = "Despacho 2.4";
const char* password = "Nabucodonosor33";

// Google Sheets API endpoint
// Using HTTP instead of HTTPS for WiFiEspAT compatibility
const char* host = "script.google.com";
const int port = 80;

// Google Apps Script ID
// Your unique script identifier
const char* scriptId =
  "AKfycbx0EOD-SCOrNhGs2lFm3gV3dZPP9_oqAbImZEhhzojHJEIgrE2XOdH7OMA8DMAuhEmg";

// Timing constants (in milliseconds)
// 10 seconds between data transmissions
const unsigned long TRANSMISSION_INTERVAL = 10000;

// WiFi connection timeout
const unsigned long WIFI_TIMEOUT = 10000;

// HTTP request timeout
const unsigned long HTTP_TIMEOUT = 5000;

/****** GLOBAL VARIABLES *****/
// WiFi and HTTP client instances
// Using WiFiClient instead of WiFiClientSecure
WiFiClient client;
HttpClient httpClient = HttpClient(client, host, port);

// Timing variables
unsigned long lastTransmissionTime = 0;
unsigned long wifiConnectionStartTime = 0;

// WiFi status flag
boolean wifiConnected = false;

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void initializeSerialCommunication(void);
void initializeWiFiConnection(void);
void checkWiFiStatus(void);
void sendDataToGoogleSheets(float temperature, float humidity);
void printDebugMessage(const char* message);
void printIPAddress(void);
float generateTemperatureData(void);
float generateHumidityData(void);
void printSensorData(float temperature, float humidity);

/****** INITIALIZATION FUNCTION *****/
void setup(void)
{
    // Initialize serial communication
    initializeSerialCommunication();

    // Print startup message
    printDebugMessage(
      "=== WiFi HTTP Cloud Data Transmission Started ==="
    );

    // Initialize WiFi connection
    initializeWiFiConnection();
}

/****** MAIN LOOP FUNCTION *****/
void loop(void)
{
    // Check WiFi connection status
    checkWiFiStatus();

    // Check if it's time to transmit data
    unsigned long currentTime = millis();
    unsigned long timeSinceLastTransmission =
      currentTime - lastTransmissionTime;

    if (wifiConnected &&
        (timeSinceLastTransmission >= TRANSMISSION_INTERVAL)) {

        // Update transmission time
        lastTransmissionTime = millis();

        // Generate sample sensor data
        float temperature = generateTemperatureData();
        float humidity = generateHumidityData();

        // Print sensor data
        printSensorData(temperature, humidity);

        // Send data to Google Sheets
        sendDataToGoogleSheets(temperature, humidity);
    }

    // Short delay to prevent overwhelming the loop
    delay(100);
}

/****** SERIAL COMMUNICATION INITIALIZATION *****/
void initializeSerialCommunication(void)
{
    // Initialize serial communication at 9600 baud
    Serial.begin(9600);

    // Wait for serial port to be ready
    delay(2000);
}

/****** WIFI CONNECTION INITIALIZATION *****/
void initializeWiFiConnection(void)
{
    printDebugMessage("Initiating WiFi connection...");
    Serial.print("Connecting to SSID: ");
    Serial.println(ssid);

    // Start WiFi connection using WiFiEspAT
    WiFi.begin(ssid, password);

    // Store connection start time for timeout handling
    wifiConnectionStartTime = millis();

    // Wait for connection with timeout
    int connectionAttempts = 0;
    // 40 attempts * 500ms = 20 seconds max
    int maxAttempts = 40;

    while (WiFi.status() != WL_CONNECTED &&
           connectionAttempts < maxAttempts) {
        delay(500);
        Serial.print(".");
        connectionAttempts++;

        // Check timeout
        unsigned long connectionElapsedTime =
          millis() - wifiConnectionStartTime;
        if (connectionElapsedTime > WIFI_TIMEOUT) {
            break;
        }
    }

    Serial.println();

    // Verify connection status
    if (WiFi.status() == WL_CONNECTED) {
        wifiConnected = true;
        printDebugMessage("WiFi connected successfully!");
        printIPAddress();
    } else {
        wifiConnected = false;
        printDebugMessage(
          "Failed to connect to WiFi after timeout"
        );
    }
}

/****** WIFI STATUS CHECKING *****/
void checkWiFiStatus(void)
{
    // Check current WiFi connection status
    if (WiFi.status() == WL_CONNECTED) {
        if (!wifiConnected) {
            // Connection was re-established
            wifiConnected = true;
            printDebugMessage("WiFi reconnected!");
            printIPAddress();
        }
    } else {
        if (wifiConnected) {
            // Connection was lost
            wifiConnected = false;
            printDebugMessage("WiFi connection lost!");

            // Attempt to reconnect
            printDebugMessage(
              "Attempting to reconnect to WiFi..."
            );
            WiFi.begin(ssid, password);
            wifiConnectionStartTime = millis();
        }
    }
}

/****** GENERATE TEMPERATURE DATA *****/
float generateTemperatureData(void)
{
    // Generate random temperature between 20.0 - 30.0 Celsius
    float temperature = random(200, 300) / 10.0;
    return temperature;
}

/****** GENERATE HUMIDITY DATA *****/
float generateHumidityData(void)
{
    // Generate random humidity between 40.0 - 60.0 percent
    float humidity = random(400, 600) / 10.0;
    return humidity;
}

/****** PRINT SENSOR DATA *****/
void printSensorData(float temperature, float humidity)
{
    Serial.println("\n========================================");
    Serial.println("--- Sensor Data ---");
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");
    Serial.println("========================================");
}

/****** SEND DATA TO GOOGLE SHEETS *****/
void sendDataToGoogleSheets(
  float temperature,
  float humidity
)
{
    // Verify WiFi connection before attempting to send
    if (WiFi.status() != WL_CONNECTED) {
        printDebugMessage(
          "ERROR: WiFi not connected. Cannot send data."
        );
        return;
    }

    printDebugMessage("Transmitting data to Google Sheets...");

    // Create URL encoded parameters for GET request
    String parameters = "?temperatura=";
    parameters += String(temperature);
    parameters += "&humedad=";
    parameters += String(humidity);
    parameters += "&timestamp=";
    parameters += String(millis());

    // Build the complete path
    String pathWithParameters = "/macros/s/";
    pathWithParameters += scriptId;
    pathWithParameters += "/exec";
    pathWithParameters += parameters;

    Serial.print("Path: ");
    Serial.println(pathWithParameters);

    // Begin HTTP GET request
    httpClient.setTimeout(HTTP_TIMEOUT);

    // Make GET request (simpler than POST for this use case)
    int httpCode = httpClient.get(pathWithParameters);

    // Print HTTP response code
    Serial.print("HTTP Response Code: ");
    Serial.println(httpCode);

    // Read and print response body
    if (httpCode > 0) {
        String responseBody = httpClient.responseBody();
        Serial.print("Server Response: ");
        Serial.println(responseBody);

        if (httpCode == 200) {
            printDebugMessage(
              "Data successfully transmitted to Google Sheets!"
            );
        } else {
            printDebugMessage(
              "HTTP request completed with non-200 status."
            );
        }
    } else {
        Serial.print("HTTP Error: ");
        Serial.println(httpCode);
        printDebugMessage(
          "ERROR: Failed to connect or request timed out."
        );
    }

    // Close the connection
    httpClient.stop();
}

/****** PRINT DEBUG MESSAGE *****/
void printDebugMessage(const char* message)
{
    Serial.print("[DEBUG] ");
    Serial.println(message);
}

/****** PRINT IP ADDRESS *****/
void printIPAddress(void)
{
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
    Serial.print("Gateway: ");
    Serial.println(WiFi.gatewayIP());
    Serial.print("DNS Server: ");
    Serial.println(WiFi.dnsIP());
}

/* END CODE */