L293d Motor Problem i just Bought it now and Producing Beeping Noise

Other Hardware Motors, Mechanics, Power and CNC
1

Hi i bought a new L293D Motor Shield and i got a problem with it. I can't seem to set my speed to 190 and if i do it it produce a beeping or buzzing sound it irritates my ears.. i tried following this tutorial on youtube but my design is different from him Arduino autonomous Robot Project: A DIY obstacle avoiding robot using an SG90 servo - YouTube. I got an rc car and on the youtube it has 2 motor also mine but on back and front. I look on to his code and the speed was set to 190 and also the motor khz is 1 i tried 64 and it does not seem to work. Also i was doing research and i found that the m3 m4 has 1 khz frequency while m1 m2 has 64 khz. Also tried that and got no luck. The beep will just gone if i set my speed to the max 255 but my goal is to slow it down a little bit.

Thank you.

Here is my Code.

#include <AFMotor.h>
AF_DCMotor backdrive(2, MOTOR12_64KHZ);
AF_DCMotor frontdrive(1, MOTOR12_64KHZ);

// initialize motor at 64 khz

void setup() {

 backdrive.setSpeed(190); 
 frontdrive.setSpeed(190);  // set speed to 190
 delay(3000);

// end of setup

}

void go_forward()
{
 backdrive.run(FORWARD);
}
void go_reverse()
{
 backdrive.run(BACKWARD);
}
void stop_car()
{
 backdrive.run(RELEASE);
 frontdrive.run(RELEASE);
}
void go_left()
{
 frontdrive.run(FORWARD);
}
void go_right()
{
 frontdrive.run(BACKWARD);
}

// initialize all forward left right and reverse


void loop()
{
 go_forward();
 delay(500);
 go_left();
 delay(1000);
 go_forward();
 delay(1000);
 go_right();
 delay(500);
 go_forward();
 delay(1000);
 stop_car();
 delay(1000);
 go_reverse();
 delay(2000);
 stop_car();
 delay(500);
 go_forward();
 delay(500);
 go_right();
 delay(500);
 go_forward();
 delay(1000);
 go_left();
 delay(500);
 go_forward();
 delay(1000);
 go_reverse();
 delay(2000);
 stop_car();
 delay(3000);

// algorithm for my rc car and it does not have sensor.
// end of loop

}

Below is my wiring:

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My motor is default and i don't know the model cause i just purchased it on the store. My wirings are just two motors connected at the motor shield. I also had an EXT_PWR and i didn't include it on my picture.

2

Please edit your post to add code tags (see the "How to use this forum" post).

Post a link to the motors you are using, and a wiring diagram.

3

Done

4

Most likely, the motors in that toy vehicle draw far too much current for the ancient, wimpy and very inefficient L293D motor driver.

Pololu makes much better motor drivers, but to decide what to buy, you have to know how much current the motors draw under a heavy load. Use your multimeter to measure it.