#include <SoftwareSerial.h> SoftwareSerial BT(0, 1); //TX, RX respetively String readvoice; int LED1 = A0; //define LED 1 pin int LED2 = A1; //define LED 2 pin int LMP=3; int LMN=4; int RMP=5; int RMN=6; long duration, distance, duration2, distance2; void setup() {  BT.begin(9600);  Serial.begin(9600);     pinMode(LMP, OUTPUT);   pinMode(LMN, OUTPUT);   pinMode(RMP, OUTPUT);   pinMode(RMN, OUTPUT);   } //-----------------------------------------------------------------------//  void loop() {   while (BT.available()){  //Check if there is an available byte to read   delay(10); //Delay added to make thing stable   char c = BT.read(); //Conduct a serial read   readvoice += c; //build the string- "forward", "reverse", "left" and "right"   }    if(readvoice == "*forward#")  {     digitalWrite(LMP, HIGH);     digitalWrite (LMN, HIGH);     digitalWrite(RMP,LOW);   ...