control the speed of a motor

Projects General Guidance
1

Please can i get a help ! I want to know how to control the speed of a motor via a potentiometer via a H-Bridge . I get the code but i dont know where is the fault !

control_report.ino (2.35 KB)

2

Please can you describe what actually happens and what is spposed to happen.

...R

3

the motor rotates clock wise for 20 seconds , and i have to control the speed of the motor via the potentiometer and then rotates anticlockwise for 20 seconds and so on

4

What is the transistor connected to? That is not the way you control the speed of a motor you apply the PWM to one of the H-bridge pins and the other to control the direction. Then you use the H-bridge enable input to turn the motor on and off. There is no need to use a transistor.

5

do you have such a code for that please

6

I just want to control the speed of the motor with h bridge L298N and potentiometer

7

For a project like it, I use this Dual H-bridge by DFRobot:

Connect the bridge and motors like this:

910×683 160 KB

The motor I use is a simple DC-motor 12V from a Carrera Racetrack car.

Connect the potmeter like this:

And finally write a program like this:

int i = 0;          //INITIALISING COUNTER
float t = 0;        //TIME

int analogPin = 3;  //ANALOG INPUT POTMETER
int fan1;           //ANALOGREAD analogPin3
int fan2;           //DIGITAL FANSPEED
int fan3;           //SERIALOUT POWER

int E1 = 12;        //DIGITALOUT FAN
int M1 = 22;        //DIGITALSET FAN



/*SETUP WITH SERIALBEGIN AND PINMODE*/

void setup() {
 Serial.begin(9600);
 pinMode(M1, OUTPUT);
}


/*LOOP*/

void loop() {
 
 /*INITIALISATION*/
 
 while(i==0){
   delay(2000);
   Serial.println("\t\t\t\tINITIALISING...");
   delay(1000);
   Serial.println("\t\t\t\t   TURN KNOB");
   i++;
 }
 
 
 /*POT READ*/
 
 fan1 = analogRead(analogPin);          //POT READ FOR WHILELOOP
 while(fan1 >= 80){                     //WHEN POT >= 80, BEGIN LOOP
   for(t = 0; t <= 9999999; t++){       //TIME RESET, TILL INFINITY
     fan1 = analogRead(analogPin);      //EVERY LOOP, READ POT
     if(fan1 <=80){                     //WHEN POT <= 80, STOP FAN
       fan2 = 0;
     }
   else                                 //WHEN POT > 80, RENDER FANSPEED
     fan2 = map(fan1, 0, 1023, 0, 255); //FANSPEED = POTREAD/1023*255
   
   
   /*SERIAL PRINT COMMANDS*/
   
   Serial.print("\tIN\t");
   Serial.print(fan1);                  //PRINT POTREAD
   Serial.print("\t\t|\tOUT\t");
   Serial.print(fan2);                  //PRINT FANSPEED
   Serial.print("\t\t|\tPOWER\t");
                                        //PRINT FANPOWER
   if(fan1 <= 80){                      //WHEN FAN = OFF, PRINT "OFF"
     Serial.println("OFF");
     analogWrite(E1, 0);
     break;
   }
   else{                                //WHEN FAN = ON, PRINT FANPOWER
     fan3 = map(fan1, 0, 1023, 0, 100); //FANPOWER = POTREAD/1023*100 (%)
     Serial.print(fan3);
     Serial.println("%");
   }
   
   digitalWrite(M1, HIGH);              //SET MOTORSHIELD HIGH
   analogWrite(E1, fan2);               //FANSPEED 0-255
   }
 }
}