遙控車

#include <SoftwareSerial.h>

char BTcmd;

SoftwareSerial BT(10,11);

int A_1A=4;

int A_1B=5;

int B_1A=6;

int B_1B=7;

void setup()

{

    Serial.begin(9600);

    BT.begin(9600);

    pinMode(A_1A,OUTPUT);

    pinMode(A_1B,OUTPUT);

    pinMode(B_1A,OUTPUT);

    pinMode(B_1B,OUTPUT);

    digitalWrite(A_1A,LOW);

    digitalWrite(A_1B,LOW);

    digitalWrite(B_1A,LOW);

    digitalWrite(B_1B,LOW);

}

//車子停止

void stopcar(){

    digitalWrite(A_1A,LOW);

    digitalWrite(A_1B,0);

    digitalWrite(B_1A,LOW);

    digitalWrite(B_1B,0);

}

//車子向前走

void go(){

    digitalWrite(A_1A,HIGH);

    analogWrite(A_1B,-255);

    digitalWrite(B_1A,HIGH);

    analogWrite(B_1B,-255);

}

//車子向後走

void back(){

    digitalWrite(A_1A,LOW);

    analogWrite(A_1B,255);

    digitalWrite(B_1A,LOW);

    analogWrite(B_1B,255);

}

//車子右轉

void left(){

    digitalWrite(A_1A,LOW);

    analogWrite(A_1B,0);

    digitalWrite(B_1A,HIGH);

    analogWrite(B_1B,-255);

}

//車子左轉

void right(){

    digitalWrite(A_1A,HIGH);

    analogWrite(A_1B,-255);

    digitalWrite(B_1A,LOW);

    analogWrite(B_1B,0);

}

void loop()

{

if (BT.available())

{

BTcmd=BT.read();

Serial.println(BTcmd);

if ('W' == BTcmd) go();

else if ('A' ==BTcmd)left();

else if ('S' ==BTcmd) back();

else if ('D' == BTcmd) right();

else stopcar();

delay(200);

}

else{

  stopcar();

  delay(200);

}

Serial.flush();

}

#include <SoftwareSerial.h>

SoftwareSerial BT(10,11);

int D=7 ;

int buttonStateD=0;

int S=6 ;

int buttonStateS=0;

int W=5 ;

int buttonStateW=0;

int A=4 ;

int buttonStateA=0;

void setup() {

  Serial.begin(9600);

  pinMode(D,INPUT); 

  pinMode(S,INPUT);

  pinMode(W,INPUT);

  pinMode(A,INPUT);

  BT.begin(9600);

  Serial.println("ready");

}

void loop() {

  buttonStateD=digitalRead(D);

  buttonStateS=digitalRead(S);

  buttonStateW=digitalRead(W);

  buttonStateA=digitalRead(A);

  if (buttonStateD==0){   

  BT.write("D");

  Serial.println("D");

  }

  if (buttonStateS==0){   

  BT.write("S");

  Serial.println("S");

  }

  if (buttonStateW==0){   

  BT.write("W");

  Serial.println("W");

  }

  if (buttonStateA==0){   

  BT.write("A");

  Serial.println("A");

  }

  delay(200);

}