Why thingspeak cant receive data from sensor ?

I made a project with a soil moisture sensor but thingspeak can't receive the measurement data. i am using esp8266 nodemcu. I've also tried via https://api.thingspeak.com/update?api_key=xxxxxxxxxxxxxxxx&field1=0 manually..the result is incoming data.

But not logging in by using esp866.

this is my code :

th#include <ESP8266WiFi.h>

char ssid [] = "Manorangi";

char pw [] = "carpediem";

String apiKey = "xxxxxxxxxxxxxxxx";

char server [] = "api.thingspeak.com";

int soil_sensor = A0;

WiFiClient client;

void setup() {

Serial.begin (115200);

delay (10);

WiFi.begin (ssid, pw);

while (WiFi.status () != WL_CONNECTED)

{

delay (100);

Serial.print ("...");

}

Serial.print ("\n Connect to... ");

Serial.println (ssid);

Serial.print (" IP Address : ");

Serial.print (WiFi.localIP ());

Serial.print ("\n");

}

void loop ()

{

int persenhumid = map (analogRead (soil_sensor),0,1023,100,0);

if (client.connect (server,80))

{

String postStr = apiKey+"&field1="+String(persenhumid)+"\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 ("Kelembaban: ");

Serial.print (persenhumid);

Serial.println ("%");

Serial.print ("Mengirim data ke Thingpeak");

Serial.print ("\n");

}

client.stop ();

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

for (unsigned int i = 0; i< 20 ; i++)

{

delay (1000);

}

}

Answer 1

[Vinod]

I'd recommend taking a look at the examples in the ThingSpeak library as a starting point for your project.

[Christopher Stapels]

Vinod is right. The library helps you deal with conection issues. In your code, you are also disconnecting too fast.