Why thingspeak cant receive data from sensor ?

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Cristin Manora
Cristin Manora on 19 Aug 2021
Edited: Vinod on 20 Aug 2021
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);

Answers (1)

Vinod on 19 Aug 2021
I'd recommend taking a look at the examples in the ThingSpeak library as a starting point for your project.
  1 Comment
Christopher Stapels
Christopher Stapels on 19 Aug 2021
Vinod is right. The library helps you deal with conection issues. In your code, you are also disconnecting too fast.

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