ThingSpeak not showing any data from my ESP32!

22 views (last 30 days)
It seems like the site isn't receiving any data. The graphics are empty!
Could you please help me? Here's the source code!
Thanks so much!
#ifdef __cplusplus
extern "C" {
#endif
uint8_t temprature_sens_read();
#ifdef __cplusplus
}
#endif
uint8_t temprature_sens_read();
#include <WiFi.h>
String apiKey = "BE7U15RJYY57AV91"; // Enter your Write API key from ThingSpeak
const char *ssid = "Ashish"; // replace with your wifi ssid and wpa2 key
const char *pass = "12345678";
const char* server = "api.thingspeak.com";
WiFiClient client;
void setup()
{
Serial.begin(115200);
delay(10);
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()
{
int h = 0;
float t =0;
h = hallRead();
t = ((temprature_sens_read()-32)/1.8); //changing temperature parameter to celsius
if (client.connect(server,80)) // "184.106.153.149" or api.thingspeak.com
{
String postStr = apiKey;
postStr +="&field1=";
postStr += String(h);
postStr += "&field2=";
postStr += String(t);
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("Hall: ");
Serial.println(h);
Serial.print("Temperature:");
Serial.print(t);
Serial.println(" C");
Serial.println("%. Send to Thingspeak.");
}
client.stop();
Serial.println("Waiting...");
delay(10000);
}

Answers (1)

Vinod
Vinod on 17 Nov 2020
I strongly recommend using the ThingSpeak library and starting from the examples provided with it.
  2 Comments

Sign in to comment.

Communities

More Answers in the  ThingSpeak Community

Products

Community Treasure Hunt

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

Start Hunting!