MATLAB Answers

Why thingspeak cant receive data from sensor ?

4 views (last 30 days)
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
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.

Sign in to comment.

Communities

More Answers in the  ThingSpeak Community

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by