Arduino Uno Wifi Rev2 - POST & DHT11

Official Hardware UNO Family UNO WiFi Rev2
1

I have Arduino Uno Wifi Rev2 and DHT11 sensor. I want to send the values of the sensor to a server and store it to a html file for now using WIFI , not Ethernet. So.. when I run the code I can see the POST in the access.log (Linux) , but It doesn't write any html files. I gave permissions to the files - still no progress. If I click for example post.php manually - It creates the file without problem. Any suggestions?

#include <WiFiNINA.h>
#include "DHT.h"
#define DHTPIN 3     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11   // DHT 11

DHT dht(DHTPIN, DHTTYPE);


char ssid[] = "";
char pass[] = "";

int status = WL_IDLE_STATUS;

char server[] = "mywebsite.com";

String postData;
String postVariable = "temp=";

WiFiClient client;

void setup() {

  Serial.begin(9600);
    dht.begin();

  while (status != WL_CONNECTED) {
    Serial.print("Trying to connect with: ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, pass);
    delay(10000);
  }

  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());
  IPAddress ip = WiFi.localIP();
  IPAddress gateway = WiFi.gatewayIP();
  Serial.print("IP Address: ");
  Serial.println(ip);
}

void loop() {
    // Wait a few seconds between measurements.
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F(" Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("C "));
  Serial.print(f);
  Serial.print(F("F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("C "));
  Serial.print(hif);
  Serial.println(F("F"));


  postData = postVariable + t ; //only temperature

  if (client.connect(server, 80)) {
    client.println("POST /arduino/post.php HTTP/1.1");
    client.println("Host: mywebsite.com");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.print("Content-Length: ");
    client.println(postData.length());
    client.println();
    client.print(postData);
  }

  if (client.connected()) {
    client.stop();
  }
  Serial.println(postData);

  delay(3000);
}

My post.php code

<?php
$file = fopen("temp.html", "w") or die("Unable to open file!");
$temp = $_POST['temp'];
fwrite($file, $temp);
?>
2

Your topic has been moved to a more suitable location on the forum. Introductory Tutorials is for tutorials that e.g. you write, not for questions. Feel free to write a tutorial once you have solved your problem :wink: