HC-05 sends endless println messages and does not respond

[exningen]

I tried the switch-case structure as GolamMostafa suggested, but there was not much progress except the arduino stopped sending tons of "Received: " messages.

Instead, I switched the BT pins to the analog pins as cattledog suggested, and I included "else" part, and it's working.

By working I mean the "Received: " messages disappeared and I now can control the LED via bluetooth. But motors are not moving.

Any idea why they are not moving?

#include <SoftwareSerial.h>
#include <AFMotor.h>
SoftwareSerial BTSerial(14,15);
AF_DCMotor Motor1(1);
AF_DCMotor Motor2(2);
AF_DCMotor Motor3(3);
AF_DCMotor Motor4(4);

void setup()
{
    BTSerial.begin(9600);
}

void loop()
{
    if (BTSerial.available() > 0) {
        char ch = BTSerial.read();
        BTSerial.print("Received: ");
        BTSerial.println(ch);
        if (ch == 'C') {
            Motor1.setSpeed(255);
            Motor1.run(BACKWARD);
            Motor2.setSpeed(255);
            Motor2.run(BACKWARD);
            Motor3.setSpeed(255);
            Motor3.run(BACKWARD);
            Motor4.setSpeed(255);
            Motor4.run(BACKWARD);
        }
        if (ch == 'D') {
            Motor1.setSpeed(0);
            Motor1.run(BRAKE);
            Motor2.setSpeed(0);
            Motor2.run(BRAKE);
            Motor3.setSpeed(0);
            Motor3.run(BRAKE);
            Motor4.setSpeed(0);
            Motor4.run(BRAKE);
        }
        if (ch == 'E') {
            digitalWrite(16, HIGH);
        }
        if (ch == 'F') {
            digitalWrite(16, LOW);
        }
        else {
          
        }
    }
}