init test code

led_bikewheel.ino

@@ -0,0 +1,14 @@
+const int HALL_PIN = A0;
+
+void setup() {
+  Serial.begin(9200);
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(HALL_PIN, INPUT);
+}
+
+void loop() {
+  int hall_value = analogRead(HALL_PIN);
+  Serial.println(hall_value);
+  // digitalWrite(LED_BUILTIN, hall_value); 
+  delay(10); //debounce? 
+}