feat: initial commit

src/main.cpp

@@ -0,0 +1,21 @@
+#include <Arduino.h>
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial) {
+    delay(10);
+  }
+
+  pinMode(LED_BUILTIN, OUTPUT);
+  Serial.println("configured");
+}
+
+void loop() {
+  Serial.println("ping");
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(1000);
+
+  Serial.println("pong");
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(1000);
+}