Speed Motor's Variator Using STM32

Speed Motor's Variator Using STM32

La variation de vitesse de moteur a courant continu dans cet article est bas�e sur le protocole PWM qu'on peut le d�finir comme ceci :

PWM

La modulation de largeur d'impulsions (MLI ; en anglais : Pulse Width Modulation, soit PWM), est une technique couramment utilis�e pour synth�tiser des signaux continus � l'aide de circuits � fonctionnement tout ou rien, ou plus g�n�ralement � �tats discrets.

Le principe g�n�ral est qu'en appliquant une succession d'�tats discrets pendant des dur�es bien choisies, on peut obtenir en moyenne sur une certaine dur�e n'importe quelle valeur interm�diaire.

Ce ph�nom�ne est fortement recommand� pour assurer la variation de vitesse de moteur a courant continu, aujourd'hui je vais vous d�montrer comment on peut g�n�rer un signal PWM d�une STM32 et visualiser son pr�sence sur des diodes LEDs.

Voici un exemple de comment on genere un signal PWM using Mikro C for ARM et STM32F4:

//Let's Electronic By Aymen Lachkhem
// www.letselectronic.blogspot.com
// Hello in this tutoriel we are going to use 4 buttons (digital Input), the first two will increase and decrease the current duty for the
// first Led and the second two will make the same thing with the other Led.
unsigned int current_duty, old_duty, current_duty1, old_duty1;
unsigned int pwm_period1, pwm_period2;

void InitMain() {
  GPIO_Digital_Input (&GPIOA_BASE, _GPIO_PINMASK_3 | _GPIO_PINMASK_4 | _GPIO_PINMASK_5 | _GPIO_PINMASK_6); // configure PORTA pins as input
}

void main() {
  InitMain();
  current_duty  = 100;                        // initial value for current_duty
  current_duty1 = 100;                        // initial value for current_duty1

  pwm_period1 = PWM_TIM1_Init(5000);
  pwm_period2 = PWM_TIM4_Init(5000);

  PWM_TIM1_Set_Duty(current_duty,  _PWM_NON_INVERTED, _PWM_CHANNEL1);  // Set current duty for PWM_TIM1
  PWM_TIM4_Set_Duty(current_duty1, _PWM_NON_INVERTED, _PWM_CHANNEL2);  // Set current duty for PWM_TIM4

  PWM_TIM1_Start(_PWM_CHANNEL1, &_GPIO_MODULE_TIM1_CH1_PE9);

  PWM_TIM4_Start(_PWM_CHANNEL2, &_GPIO_MODULE_TIM4_CH2_PD13);

  while (1) {                                // endless loop
    if (GPIOA_IDR.B3) {                // button on RA3 pressed
      Delay_ms(1);
      current_duty = current_duty + 5;       // increment current_duty
      if (current_duty > pwm_period1) {      // if we increase current_duty greater then possible pwm_period1 value
        current_duty = 0;                    // reset current_duty value to zero
      }
      PWM_TIM1_Set_Duty(current_duty,  _PWM_NON_INVERTED, _PWM_CHANNEL1); // set newly acquired duty ratio
     }

    if (GPIOA_IDR.B4) {                // button on RA4 pressed
      Delay_ms(1);
      current_duty = current_duty - 5;       // decrement current_duty
      if (current_duty > pwm_period1) {      // if we decrease current_duty greater then possible pwm_period1 value (overflow)
        current_duty = pwm_period1;          // set current_duty to max possible value
      }
      PWM_TIM1_Set_Duty(current_duty,  _PWM_NON_INVERTED, _PWM_CHANNEL1); // set newly acquired duty ratio
     }

    if (GPIOA_IDR.B5) {                // button on RA5 pressed
      Delay_ms(1);
      current_duty1 = current_duty1 + 5;     // increment current_duty
      if (current_duty1 > pwm_period2) {     // if we increase current_duty1 greater then possible pwm_period2 value
        current_duty1 = 0;                   // reset current_duty1 value to zero
      }
      PWM_TIM4_Set_Duty(current_duty1, _PWM_NON_INVERTED, _PWM_CHANNEL2);       // set newly acquired duty ratio
     }

    if (GPIOA_IDR.B6) {                // button on RA6 pressed
      Delay_ms(1);
      current_duty1 = current_duty1 - 5;     // decrement current_duty
      if (current_duty1 > pwm_period2) {     // if we decrease current_duty1 greater then possible pwm_period1 value (overflow)
        current_duty1 = pwm_period2;         // set current_duty to max possible value
      }
      PWM_TIM4_Set_Duty(current_duty1, _PWM_NON_INVERTED, _PWM_CHANNEL2);
     }

    Delay_ms(1);                             // slow down change pace a little
  }
}

    Voici une d�monstration vid�o de fonctionnement :

L�objectif de ce tutoriel est de mettre en oeuvre le contr�le de vitesse de moteur a courant continu de fa�on autonome 

Pour ceci on aura besoin de 

Un Moteur DC

STM32 F4

Transistor TIP122

Diode

Deux boutons poussoirs 

deux r�sistances 1 K

Le principe est tout � fait simple on aura deux boutons poussoirs ou la premi�re va incr�menter la vitesse de moteur et la deuxi�me va faire exactement le contraire.

L�incr�mentation continuera jusqu�� alimenter le moteur en r�gime de rapport cyclique complet puis conditionnement une autre incr�mentation va le remettre a 0 tour/s, le m�me truc se passe avec la d�cr�mentation de rapport d�ja nul va le rendre on vitesse maximale.

Voici un exemple de comment on varie le vitesse de moteur a courant continu using Mikro C for ARM et STM32F4:

//Let's Electronic By Aymen Lachkhem
// www.letselectronic.blogspot.com
// In This Tutorial We are going to control the speed of dc motor using Stm32 PWM.
unsigned int current_duty, old_duty;
unsigned int pwm_period1, pwm_period2;

void InitMain() {
  GPIO_Digital_Input (&GPIOA_BASE, _GPIO_PINMASK_3 | _GPIO_PINMASK_4 ); // configure PORTA pins as speed control input
}

void main() {
  InitMain();
  current_duty  = 100;                        // initial value for current_duty


  pwm_period1 = PWM_TIM1_Init(5000);


  PWM_TIM1_Set_Duty(current_duty,  _PWM_NON_INVERTED, _PWM_CHANNEL1);  // Set current duty for PWM_TIM1

  PWM_TIM1_Start(_PWM_CHANNEL1, &_GPIO_MODULE_TIM1_CH1_PE9);



  while (1) {                                // endless loop
    if (GPIOA_IDR.B3) {                // button on RA3 pressed
      Delay_ms(1);
      current_duty = current_duty + 1;       // increment speed
      if (current_duty > pwm_period1) {      // if we increase current_duty greater then possible pwm_period1 value
        current_duty = 0;                    // reset current_duty value to zero
      }
      PWM_TIM1_Set_Duty(current_duty,  _PWM_NON_INVERTED, _PWM_CHANNEL1); // set newly acquired duty ratio
     }

    if (GPIOA_IDR.B4) {                // button on RA4 pressed
      Delay_ms(1);
      current_duty = current_duty - 3;       // decrement speed
      if (current_duty > pwm_period1) {      // if we decrease current_duty greater then possible pwm_period1 value (overflow)
        current_duty = pwm_period1;          // set current_duty to max possible value
      }
      PWM_TIM1_Set_Duty(current_duty,  _PWM_NON_INVERTED, _PWM_CHANNEL1); // set newly acquired duty ratio
     }

    Delay_ms(1);                             // slow down change pace a little
  }
}

    Voici une d�monstration vid�o de fonctionnement :