MR60BHA2: failing to get arduino examples to work

Products & Technology XIAO
4

It must match Serial.begin(baudRate) in your sketch (default for ESPHome is usually 115200, but some examples use 9600).
Ensure Serial Monitor is Closed During Upload.
Try a minimal working sketch:

void setup() {
  Serial.begin(115200);
  delay(1000); // Wait a bit for Serial to initialize
  Serial.println("Booting...");
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  Serial.println("Blink");
  digitalWrite(LED_BUILTIN, HIGH);
  delay(500);
  digitalWrite(LED_BUILTIN, LOW);
  delay(500);
}

Open Serial Monitor at 115200 baud and look for output. The problem may happen due to wrong SSID/password. It is also possible that WiFi.begin() is not being followed by WiFi.waitForConnectResult() or while (!WiFi.isConnected()) {...}

If you want to keep all info about MQTT always handy, you can see here: ESP32 MQTT - The Engineering Projects

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