Trying to write a unique obstacle avoiding car

[gcjr]

consider adding something like the following (some what edited to exercise the different parts of your code. Add an autoFlag to en/disable your existing code

@xfpd

void loop()
{
    ...

    if (Serial.available()) {
        bluetooth_val = Serial.read();
        Serial.println(bluetooth_val);

        switch (bluetooth_val) {
        case (0): Car_Front();   break;
        case (1): Car_back();    break;
        case (2): Car_left();    break;
        case (3): Car_right();   break;
        case (4): Car_Stop();    break;
        case (5): Car_T_left();  break;
        case (6): Car_T_right(); break;
        default: break;
        }
    }
}