Send data from ESP8266 TO thingspeack

Development Tools Cloud IoT
1

I am using ESP8266 and a thermistor sensor. Can anyone help why this code is not sending data to thingspeak, even though it runs successively.

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>

const char* ssid = "BabakerUH4th_5G@unifi";
const char* password = "BabakerSt2021";
const char* thingspeakAPIKey = "CU1DL1Y5ZJF59YIO";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
}

void loop() {
  // Read the temperature sensor value
  int temperatureReading = analogRead(A0);
  Serial.print("Temperature Reading: ");
  Serial.println(temperatureReading);

  // Convert the reading to a temperature value (in degrees Celsius)
  float temperature = temperatureReading / 1023.0 * 3.3 / 0.01;
  Serial.print("Temperature: ");
  Serial.println(temperature);

  // Create a WiFiClient object
  WiFiClient client;

  // Build the HTTP POST request
  String postData = "field1=" + String(temperature);
  HTTPClient http;
  http.begin(client, "http://api.thingspeak.com/update?api_key=" + String(thingspeakAPIKey));
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  int httpResponseCode = http.POST(postData);

  // Check for error
  if (httpResponseCode > 0) {
    Serial.print("HTTP Response Code: ");
    Serial.println(httpResponseCode);
  } else {
    Serial.print("Error: ");
    Serial.println(http.errorToString(httpResponseCode).c_str());
  }

  // Wait a minute before sending the next update
  delay(60000);
}
2

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.