求助arduino用超声波手势控制音乐播放

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烧写以下代码到UNO：const int EchoPin = 2; //超声波信号输入const int TrigPin = 3; //超声波控制信号输出int currDist = 0; void setup(){pinMode(EchoPin, INPUT);for (int pinindex = 3; pinindex < 8; pinindex++) {pinMode(pinindex, OUTPUT); // set pins 3 to 10 as outputs}pinMode(A0,OUTPUT);pinMode(A1,OUTPUT);pinMode(A2,OUTPUT);pinMode(A3,OUTPUT);digitalWrite(A0,LOW);digitalWrite(A1,LOW);digitalWrite(A2,LOW);digitalWrite(A3,LOW);Serial.begin(9600);}void loop(){currDist = MeasuringDistance(); //读取前端距离//Serial.println(currDist);if(currDist > 25){}//power开关看个人需要，这里没有启用//else if(currDist < 8){// mpower();// }else if(currDist < 7){mpause();}else if(currDist < 15){mnext();}else if(currDist < 25){mprev();}}long MeasuringDistance() {long duration;digitalWrite(TrigPin, LOW);delayMicroseconds(2);digitalWrite(TrigPin, HIGH);delayMicroseconds(10);digitalWrite(TrigPin, LOW);duration = pulseIn(EchoPin, HIGH);return duration / 29 / 2;}//mplay播放void mplay() {digitalWrite(A0, HIGH);delay(100);digitalWrite(A0, LOW);Serial.println("mplay");} //mprev上一首void mprev() {digitalWrite(A1, HIGH);delay(1000);digitalWrite(A1, LOW);Serial.println("mprev");}//mnext下一首 void mnext() {digitalWrite(A2, HIGH);//return;delay(1000);digitalWrite(A2, LOW);Serial.println("mnext");} //mpause暂停void mpause() {digitalWrite(A0, HIGH);delay(1000);digitalWrite(A0, LOW);Serial.println("mpause");} //mpower//void mpower() {// digitalWrite(A3, HIGH);// delay(500);//digitalWrite(A3, LOW);// Serial.println("mpower");//}