When Roamer's bumper is depressed, there are five possible "backup and turn" scenarios--the activation choice is random.

After 30 seconds of forward movement (stuck spinning wheels without depressing the bumper or long distance), she backs up and tries another direction.

unsigned long timestart;
unsigned long timeend;
unsigned long timetotal;

int a=95;//speed for left? motor, increased from 80
int b=85;
int c=650;//value for photoresistor day/night higher = less light to keep going
int d=820;//upper voltage value

int t1=1;

int volt=A1;//bumper input pin
int val=0;//initial bumper value
int val1=100;//initial value for photocell

int bumper=1;//setup bumper not pressed
long randNumber;
int x=1;//current read value to be determined in setup
int x1=0;//first of multiple reads
int x2=0;
int x3=0;
int x4=0;
int x5=0;

int y=0;//counts for overcurrent rather than spike
int z=0;//storage area for temporary current reads

const int pwmA=3;
const int pwmB=11;
const int brakeA=9;
const int brakeB=8;
const int dirA=12;
const int dirB=13;

void setup() {
  
  pinMode (dirA,OUTPUT);
  pinMode (brakeA,OUTPUT);
  pinMode (dirB,OUTPUT);
  pinMode (brakeB,OUTPUT);
  pinMode (A1,INPUT);
  

  pinMode (2,INPUT);
  digitalWrite (2,HIGH);
  randomSeed (analogRead(0));
  
  digitalWrite(brakeA,LOW);
  digitalWrite(brakeB,LOW);
  
   digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,0);//changed to reflect no overcurrent mode
  analogWrite(pwmB,0);
  //delay(2000);//get motors started
  //x1=analogRead(A0);//set normal motor value
  //delay(10);
  //x2=analogRead(A0);
  //delay(10);
  //x3=analogRead(A0);
  //delay(10);
  //x4=analogRead(A0);
  //delay(10);
  //x5=analogRead(A0);
  
  //x=((x1+x2+x3+x4+x5)/5);
  x=500;//arbitray number
  
  timestart=millis();
  
}

void loop() {
  
  bumper=digitalRead(2);
  if (bumper==0) {//bumper depressed
  randNumber=random(1,5);//changed august 12 from 1,4
  
  if(randNumber==1) {
    
    analogWrite(pwmB,0);//check for power station
    analogWrite(pwmA,0);
    delay(500);//stop to read
    val=analogRead(A2);
    if (val>100) {
      val1=analogRead(A3);
      while ((val<d && val>100) || (val1>c)) {//was 815 instead of 600
       val1=analogRead(A3);
        val=analogRead(A2);
        delay(100);
      }}
      
    
    
    digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,120);//was 150
    analogWrite(pwmB,70);//reverse power
    delay(500);
    analogWrite(pwmB,0);
    delay(750);
    analogWrite(pwmA,0);//stop
    
    digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
  
  t1=0;
  timestart=millis();
  
  }
  
  if (randNumber==2) {
    
    analogWrite(pwmB,0);//check for power station
    analogWrite(pwmA,0);
    delay(500);//stop to read
    val=analogRead(A2);
    if (val>100) {
      val1=analogRead(A3);
      while ((val<d && val>100) ||(val1>c)) {
         val1=analogRead(A3);
       val=analogRead(A2);
        delay(100);
      }}
    
    digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,70);//was 150
    analogWrite(pwmB,120);//reverse power
    delay(600);
    analogWrite(pwmA,0);
    delay(1000);
    analogWrite(pwmB,0);//stop
    
    digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
  
  t1=0;
  timestart=millis();
  }
  
  if (randNumber==3) {
    
    analogWrite(pwmB,0);//check for power station
    analogWrite(pwmA,0);
    delay(500);//stop to read
    val=analogRead(A2);
    if (val>100) {
      val1=analogRead(A3);
      while ((val<d && val>100) || (val1>c)) {
         val1=analogRead(A3);
        val=analogRead(A2);
        delay(100);
      }}
    
    digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,a);//was 150
    analogWrite(pwmB,b);//reverse power
    delay(600);
    digitalWrite(dirB,HIGH);
    analogWrite(pwmB,150);
    delay(800);
    analogWrite(pwmA,0);//stop
    analogWrite(pwmB,0);
    
    digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
  
  t1=0;
  timestart=millis();
  }

 if(randNumber==4) {
    
    analogWrite(pwmB,0);//check for power station
    analogWrite(pwmA,0);
    delay(500);//stop to read
    val=analogRead(A2);
    if (val>100) {
      val1=analogRead(A3);
      while ((val<d && val>100) || (val1>c)) {//was 815 instead of 600
       val1=analogRead(A3);
        val=analogRead(A2);
        delay(100);
      }}
      
    
    
    digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,a);//was 150
    analogWrite(pwmB,b);//reverse power
    delay(500);
    analogWrite(pwmB,0);
    delay(1000);
    analogWrite(pwmA,0);//stop
    
    digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
  
  t1=0;
  timestart=millis();
  
  }
  
   if(randNumber==5) {
    
    analogWrite(pwmB,0);//check for power station
    analogWrite(pwmA,0);
    delay(500);//stop to read
    val=analogRead(A2);
    if (val>100) {
      val1=analogRead(A3);
      while ((val<d && val>100) || (val1>c)) {//was 815 instead of 600
       val1=analogRead(A3);
        val=analogRead(A2);
        delay(100);
      }}
      
    
    
    digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,a);//was 150
    analogWrite(pwmB,b);//reverse power
    delay(400);
    analogWrite(pwmB,0);
    delay(800);
    analogWrite(pwmA,0);//stop
    
    digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
  
  t1=0;
  timestart=millis();
  
  }
  
  

}
  
  
  //main body of action
  if (t1=0) {
    timestart = millis();
    t1=1;
  }
  if (t1=1) {
    timeend = millis();
    timetotal= (timeend-timestart);
  }
    if (timetotal>30000) {
     digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,a);//was 150
    analogWrite(pwmB,b);//reverse power
    delay(1000);
    digitalWrite(dirB,HIGH);
    analogWrite(pwmB,150);
    delay(1000);
    analogWrite(pwmA,0);//stop
    analogWrite(pwmB,0);
    
    digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
 
 t1=0;
 timestart=millis();
    } 
      
  digitalWrite(dirA,HIGH);
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  
  z=analogRead(A0);//read current
  
  if (z>(x+210))  {//turn around and restart
      digitalWrite(dirA,LOW);
    digitalWrite(dirB,LOW);//reverse
    analogWrite(pwmA,150);
    analogWrite(pwmB,150);//reverse power
    delay(1000);
    digitalWrite(dirB,HIGH);
    analogWrite(pwmB,150);
    delay(600);
    analogWrite(pwmA,0);//stop
    analogWrite(pwmB,0);
    
    digitalWrite(dirA,HIGH);//go forward one second
  digitalWrite(dirB,HIGH);
  analogWrite(pwmA,a);
  analogWrite(pwmB,b);
  delay(1000);
  
  t1=0;
  timestart=millis();
    } 
    
  
}