Project Description

• The experiment demonstrates real-time cloud-to-device communication using XIAO ESP32-C3 and Adafruit IO.

• A slider widget on the Adafruit IO dashboard acts as the sender, transmitting angle values through a cloud feed named “servo”.

• The ESP32-C3 microcontroller, as the receiver, subscribes to this feed and moves a servo motor to the specified position.

Thus, the message sent between the two projects is the servo angle value , transmitted via the internet using MQTT protocol.

Arduino Code

#include <WiFi.h>
#include "AdafruitIO_WiFi.h"
#include <ESP32Servo.h>

// Adafruit IO Credentials
#define IO_USERNAME  "muhesh1"
#define IO_KEY       "aio_FxIC98S56I4KYL6JE7wJM38j0rXV"

// Wi-Fi Credentials
#define WIFI_SSID "Forge_office"
#define WIFI_PASS "Forged@Forge"

// Create Adafruit IO instance
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS);

// Define servo feed
AdafruitIO_Feed *servoFeed = io.feed("servo");

// Servo configuration
Servo myServo;
int servoPin = 6;  // GPIO6 on XIAO ESP32-C3

void setup() {
  Serial.begin(115200);
  myServo.attach(servoPin);

  Serial.print("Connecting to Adafruit IO");
  io.connect();
  servoFeed->onMessage(handleServo);

  while (io.status() < AIO_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("\nConnected to Adafruit IO!");
}
void loop() {
  io.run();  // Keep the connection alive
}
void handleServo(AdafruitIO_Data *data) {
  int angle = data->toInt();
  Serial.print("Received Servo Angle: ");
  Serial.println(angle);
  angle = constrain(angle, 0, 180);
  myServo.write(angle);
}