2018年11月12日星期一

ESP32 Temperature, Humidity data upload to ThingSpeak

//========================================================

// Robo India Tutorial

// Simple code upload the tempeature and humidity data using thingspeak.com

// Hardware: ESP32,DHT11

#include "DHT.h" // Including library for dht

#include <WiFi.h>

String apiKey = "8U1H2OD8L4P9L718"; // Enter your Write API key from ThingSpeak

const char *ssid = "alex9ufo"; // replace with your wifi ssid and wpa2 key

const char *pass = "alex9981";

const char* server = "api.thingspeak.com";

#define DHTPIN 23 //pin where the dht11 is connected

DHT dht(DHTPIN, DHT11);

WiFiClient client;

void setup()

{

Serial.begin(115200);

delay(10);

dht.begin();

Serial.println("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, pass);

while (WiFi.status() != WL_CONNECTED)

{

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.println("WiFi connected");

}

//========================================================

void loop()

{

float h = dht.readHumidity();

float t = dht.readTemperature();

if (isnan(h) || isnan(t))

{

Serial.println("Failed to read from DHT sensor!");

return;

}

if (client.connect(server,80)) // "184.106.153.149" or api.thingspeak.com

{

String postStr = apiKey;

postStr +="&field1=";

postStr += String(t);

postStr +="&field2=";

postStr += String(h);

postStr += "\r\n\r\n";

client.print("POST /update HTTP/1.1\n");

client.print("Host: api.thingspeak.com\n");

client.print("Connection: close\n");

client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");

client.print("Content-Type: application/x-www-form-urlencoded\n");

client.print("Content-Length: ");

client.print(postStr.length());

client.print("\n\n");

client.print(postStr);

Serial.print("Temperature: ");

Serial.print(t);

Serial.print(" degrees Celcius, Humidity: ");

Serial.print(h);

Serial.println("%. Send to Thingspeak.");

}

client.stop();

Serial.println("Waiting...");

// thingspeak needs minimum 15 sec delay between updates, i've set it to 30 seconds

delay(10000);

}

//========================================================

APP