AWOL:
Have you tried mounting the sensors lower down?
I had done but it was unsuccessful.Probably,i must solve writing as the code: if sensor's datas(distance) are same,it's time motors stop and run the backward until 1 seconds.I wrote that but it was useless.I must cahange this code but what?
void accelerateBackward () {
if (readPing()==readPing()){
moveStop();
motor1.run(BACKWARD);
motor2.run(BACKWARD);
delay(1000);
}
}