Toma la hora actual de Internet.
// Libraries for SD card
#include "FS.h"
#include "SD.h"
#include <SPI.h>
// Libraries for DHT11
#include <DHT.h>
// Libraries to get time from NTP Server
#include <WiFi.h>
#include "time.h"
// Replace with your network credentials
const char* ssid = "Daniel";
const char* password = "12345678";
// Timer variables
unsigned long lastTime = 0;
unsigned long timerDelay = 30000;
DHT dht27(27,DHT11);
// Variables to hold sensor readings
float temp;
String dataMessage;
// NTP server to request epoch time
const char* ntpServer = "pool.ntp.org";
// Variable to save current epoch time
unsigned long epochTime;
// Function that gets current epoch time
unsigned long getTime() {
time_t now;
struct tm timeinfo;
if (!getLocalTime(&timeinfo)) {
//Serial.println("Failed to obtain time");
return(0);
}
time(&now);
return now;
}
// Initialize WiFi
void initWiFi() {
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.print("Connecting to WiFi ..");
while (WiFi.status() != WL_CONNECTED) {
Serial.print('.');
delay(1000);
}
Serial.println(WiFi.localIP());
}
// Initialize SD card
void initSDCard(){
if (!SD.begin()) {
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD.cardType();
if(cardType == CARD_NONE){
Serial.println("No SD card attached");
return;
}
Serial.print("SD Card Type: ");
if(cardType == CARD_MMC){
Serial.println("MMC");
} else if(cardType == CARD_SD){
Serial.println("SDSC");
} else if(cardType == CARD_SDHC){
Serial.println("SDHC");
} else {
Serial.println("UNKNOWN");
}
uint64_t cardSize = SD.cardSize() / (1024 * 1024);
Serial.printf("SD Card Size: %lluMB\n", cardSize);
}
// Write to the SD card.
void writeFile(fs::FS &fs, const char * path, const char * message) {
Serial.printf("Writing file: %s\n", path);
File file = fs.open(path, FILE_WRITE);
if(!file) {
Serial.println("Failed to open file for writing");
return;
}
if(file.print(message)) {
Serial.println("File written");
} else {
Serial.println("Write failed");
}
file.close();
}
// Append data to the SD card
void appendFile(fs::FS &fs, const char * path, const char * message) {
Serial.printf("Appending to file: %s\n", path);
File file = fs.open(path, FILE_APPEND);
if(!file) {
Serial.println("Failed to open file for appending");
return;
}
if(file.print(message)) {
Serial.println("Message appended");
} else {
Serial.println("Append failed");
}
file.close();
}
void setup() {
Serial.begin(115200);
initWiFi();
dht27.begin();
initSDCard();
configTime(0, 0, ntpServer);
// If the data.txt file doesn't exist
// Create a file on the SD card and write the data labels
File file = SD.open("/data.txt");
if(!file) {
Serial.println("File doesn't exist");
Serial.println("Creating file...");
writeFile(SD, "/data.txt", "Epoch Time, Temperature \r\n");
}
else {
Serial.println("File already exists");
}
file.close();
}
void loop() {
if ((millis() - lastTime) > timerDelay) {
//Get epoch time
epochTime = getTime();
//Get sensor readings
temp = dht27.readTemperature();
//temp = 1.8*bme.readTemperature() + 32;
//Concatenate all info separated by commas
dataMessage = String(epochTime) + "," + String(temp)+"\r\n";
Serial.print("Saving data: ");
Serial.println(dataMessage);
//Append the data to file
appendFile(SD, "/data.txt", dataMessage.c_str());
lastTime = millis();
}
}
