 #include <SoftwareSerial.h>
- 
+
 #define FALL 8
 #define RISE 9
 #define TRIG 10
 #define ECHO 11
- 
+
 /*
 [State]
 READY : 0
 FALLING : 1
 RISING : 2
 */
- 
+
 int state = 0;
- 
+
 void setup() {
   pinMode(FALL, OUTPUT);
   pinMode(RISE, OUTPUT);

        digitalWrite(TRIG, HIGH);
        delayMicroseconds(10);
        digitalWrite(TRIG, LOW);
 
        distance = pulseIn(ECHO, HIGH, 11000);
 
        if (distance == 0) {
          return;
        }
 
        distance = distance / 58.2;
        Serial.println(distance);
        break;
      case 'g':
        Serial.println(state);
        break;
    }

  digitalWrite(FALL, HIGH);
  digitalWrite(RISE, HIGH);
}

void loop() {
  long distance = 0;

  if (Serial.available()) {
    char c = Serial.read();
    switch (c) {
