sending value of dht sensor using nodemcu

I am using this code for sending the temperature to my channel but getting nun and did not received any value. plz help

#include <ESP8266WiFi.h>

#include "DHT.h"

String apiWritekey = "KSB45J7R0MLLKF7U"; // replace with your THINGSPEAK WRITEAPI key here

const char* ssid = "vivo"; // your wifi SSID name

const char* password = "20051999" ;// wifi pasword

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

#define DHTPIN 14 // Data Pin of DHT 11 , for NodeMCU D5 GPIO no. is 14

#define DHTTYPE DHT11 // DHT 11

DHT dht(DHTPIN, DHTTYPE);

//float resolution=3.3/1023;// 3.3 is the supply volt & 1023 is max analog read value

WiFiClient client;

void setup() {

Serial.begin(115200);

dht.begin();

WiFi.disconnect();

delay(10);

WiFi.begin(ssid, password);

Serial.println();

Serial.println();

Serial.print("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.print("NodeMcu connected to wifi...");

Serial.println(ssid);

Serial.println();

}

void loop() {

//float temp = (analogRead(A0) * resolution) * 100;

float temp = dht.readTemperature();

Serial.println(temp);

if (client.connect(server,80))

{

String tsData = apiWritekey;

tsData +="&field1=";

tsData += String(temp);

tsData += "\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: "+apiWritekey+"\n");

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

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

client.print(tsData.length());

client.print("\n\n"); // the 2 carriage returns indicate closing of Header fields & starting of data

client.print(tsData);

Serial.print("Temperature: ");

Serial.print(temp);

Serial.println("uploaded to Thingspeak server....");

}

client.stop();

Serial.println("Waiting to upload next reading...");

Serial.println();

// thingspeak needs minimum 15 sec delay between updates

delay(15000);

}

Answer 1

[Laura Gautschi]

Did you use the correct api key? the WRITE key not the read key.

And is you computer connected to the same wlan as you mentioned in your sketch?