Issue with Reading Data from ThingSpeak in Arduino (Returns 0)

Using Arduino Project Guidance
1

Schematic
Schematic1366×768 119 KB

Hello everyone!

I am working on an Arduino project that integrates with ThingSpeak to read sensor data (temperature and humidity) and control an LED. However, when trying to read data from ThingSpeak, my Arduino always returns 0, even though the data is updated on ThingSpeak.

Code Snippet

void readLED() {
  int ledStatus =  ThingSpeak.readIntField(myChannelNumber,3,myReadAPIKey);  // Read field 3 value
  Serial.println(ledStatus);
  // Update LED state based on the read value
  if (ledStatus == 1) {
    digitalWrite(LED_PIN, HIGH);  // Turn LED on
    Serial.println("LED turned ON");
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn LED off
    Serial.println("LED turned OFF");
}
}

What I've Tried:

  • Verified the API key and channel ID.
  • Confirmed that the data is updating correctly on ThingSpeak.
  • Ensured my Arduino Uno R4 WiFi is connected to the internet.
  • Added delays between requests to avoid rate-limiting.

Problem :

When I am printing the LED Status on the serial monitor it always prints 0 regardless of the state of the ThingSpeak field values.

Repository Link:

You can view the code and project setup here: GitHub Repository Link

2

Please post annutated schematics and code according to the advice in How to get the best out of this forum - Using Arduino / Project Guidance - Arduino Forum