my project graph is not showing in my channel

#include <DHT.h>  // Including library for dht

#include <ESP8266WiFi.h>

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

const char *ssid =  "ssid";     // replace with your wifi ssid and wpa2 key
const char *pass =  "@pwd";
const char* server = "api.thingspeak.com";

#define DHTPIN 0          //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
            delay(1000);
            }

Answer 1

[Christopher Stapels]

We reccomend using the ThingSpeak library for arduino and ESP. It will take care of a lot of problems for you.

First, however I would try to update your channel in a browser address bar, just to be sure you have the syntax correct. You can get the correct format on the API keys tab of your channel. After that, then come back to the sensor coe (hopefully integrating with the ThingSpeak library) , but output the values to the serial monitor to make sure the values are read correctly first.