Got a simple ESPHome yaml that works with HA

xiao-esp32c3-light-sensor.ino

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+#include <WiFi.h>
+#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager WiFi Configuration Magic
+#include <hp_BH1750.h>            // Library for the light sensor
+
+const int configbutton = D9; // Input for config button
+const int led = D10; // Output for status LED
+int configbuttonStatus = digitalRead(configbutton);
+bool ready = 0;
+int counter = 0;
+hp_BH1750 BH1750;
+
+int status = WL_IDLE_STATUS;
+
+void setup()
+{
+  pinMode(led, OUTPUT);
+  pinMode(configbutton, INPUT_PULLUP);
+
+  Serial.println("reset button: ");
+  Serial.println(configbuttonStatus);
+  
+
+  // check for the presence of the shield:
+  if (WiFi.status() == WL_NO_SHIELD) {
+    Serial.println("WiFi shield not present");
+    while(true);  // don't continue
+  }
+
+  WiFiManager wifiManager;
+  wifiManager.autoConnect("ESP32-LS");
+  
+  while(WiFi.status() != WL_CONNECTED) {
+    digitalWrite(led, HIGH);
+    delay(1000);
+    digitalWrite(led, LOW);
+    delay(1000); 
+  }
+
+  if(WiFi.status() == WL_CONNECTED){
+    digitalWrite(led, HIGH);
+  }
+
+
+  bool avail = BH1750.begin(BH1750_TO_GROUND);
+  if (!avail) {
+    Serial.println("No BH1750 sensor found!");
+    while (true) {};                                        
+  }
+}
+
+
+void loop () {
+  while(WiFi.status() != WL_CONNECTED) {
+    digitalWrite(led, HIGH);
+    delay(1000);
+    digitalWrite(led, LOW);
+    delay(1000); 
+  }
+  
+  
+  if ( configbuttonStatus != digitalRead(configbutton) ) {
+    WiFiManager wifiManager;
+    wifiManager.startConfigPortal("ESP32-LS");
+    Serial.println("connected...yeey :)");
+  }
+
+  BH1750.start();
+  float lux=BH1750.getLux();
+  Serial.println(lux);    
+  delay(5000);
+}