brushless21  2.0.0.0
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Brushless 21 click

Brushless 21 Click is a compact add-on board suitable for controlling brushless DC (BLDC) motors with any MCU. This board features the AMT49400, an advanced 3-phase, sensorless BLDC motor driver with integrated power MOSFETs from Allegro Microsystems. The AMT49400 is rated for an operating voltage range from 4V to 16V. Motor rotation speed is controlled by applying a duty cycle command to the PWM input, while a simple I2C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles.

click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Jan 2022.
  • Type : PWM/I2C type

Software Support

We provide a library for the Brushless 21 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Brushless 21 Click driver.

Standard key functions :

Example key functions :

Example Description

This example demonstrates the use of the Brushless 21 click board by driving the motor at different speeds.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the click default configuration which sets the GPIO as a default communication and enables the PWM.

void application_init ( void )
{
log_cfg_t log_cfg;
brushless21_cfg_t brushless21_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
brushless21_cfg_setup( &brushless21_cfg );
BRUSHLESS21_MAP_MIKROBUS( brushless21_cfg, MIKROBUS_1 );
err_t init_flag = brushless21_init( &brushless21, &brushless21_cfg );
if ( ( PWM_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( BRUSHLESS21_ERROR == brushless21_default_cfg ( &brushless21 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}

Application Task

Controls the motor speed by changing the PWM duty cycle once per second. The duty cycle ranges from 0% to 100%.

When the click board is configured in I2C mode the motor switches the direction at a minimal speed. Also, the chip internal temperature, VBB voltage and the motor speed readings are supported in I2C mode. Each step will be logged on the USB UART where you can track the program flow.

void application_task ( void )
{
static int8_t duty_cnt = 1;
static int8_t duty_inc = 1;
float duty = duty_cnt / 10.0;
if ( BRUSHLESS21_OK == brushless21_set_duty_cycle ( &brushless21, duty ) )
{
log_printf( &logger, "\r\n Duty Cycle : %d%%\r\n", ( uint16_t )( duty_cnt * 10 ) );
}
if ( BRUSHLESS21_DRV_SEL_I2C == brushless21.drv_sel )
{
int8_t temperature = 0;
float motor_speed = 0;
float vbb_voltage = 0;
if ( BRUSHLESS21_OK == brushless21_get_temperature ( &brushless21, &temperature ) )
{
log_printf( &logger, " Temperature: %d C\r\n", ( int16_t ) temperature );
}
if ( BRUSHLESS21_OK == brushless21_get_motor_speed ( &brushless21, &motor_speed ) )
{
log_printf( &logger, " Motor Speed: %.2f Hz\r\n", motor_speed );
}
if ( BRUSHLESS21_OK == brushless21_get_vbb_voltage ( &brushless21, &vbb_voltage ) )
{
log_printf( &logger, " VBB Voltage: %.2f V\r\n", vbb_voltage );
}
if ( 0 == duty_cnt )
{
duty_inc = 1;
if ( BRUSHLESS21_OK == brushless21_switch_direction ( &brushless21 ) )
{
log_printf( &logger, " Switch direction\r\n" );
}
}
}
if ( 10 == duty_cnt )
{
duty_inc = -1;
}
else if ( 0 == duty_cnt )
{
duty_inc = 1;
}
duty_cnt += duty_inc;
Delay_ms ( 1000 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.Brushless21

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.


brushless21_cfg_t
Brushless 21 Click configuration object.
Definition: brushless21.h:227
brushless21_set_duty_cycle
err_t brushless21_set_duty_cycle(brushless21_t *ctx, float duty_cycle)
Brushless 21 set duty cycle function.
application_task
void application_task(void)
Definition: main.c:69
brushless21_default_cfg
err_t brushless21_default_cfg(brushless21_t *ctx)
Brushless 21 default configuration function.
brushless21_get_temperature
err_t brushless21_get_temperature(brushless21_t *ctx, int8_t *temperature)
Brushless 21 get temperature function.
brushless21_t
Brushless 21 Click context object.
Definition: brushless21.h:204
brushless21_cfg_setup
void brushless21_cfg_setup(brushless21_cfg_t *cfg)
Brushless 21 configuration object setup function.
brushless21_get_motor_speed
err_t brushless21_get_motor_speed(brushless21_t *ctx, float *motor_speed_hz)
Brushless 21 get motor speed function.
brushless21_switch_direction
err_t brushless21_switch_direction(brushless21_t *ctx)
Brushless 21 switch direction function.
BRUSHLESS21_ERROR
@ BRUSHLESS21_ERROR
Definition: brushless21.h:253
application_init
void application_init(void)
Definition: main.c:32
brushless21_init
err_t brushless21_init(brushless21_t *ctx, brushless21_cfg_t *cfg)
Brushless 21 initialization function.
BRUSHLESS21_DRV_SEL_I2C
@ BRUSHLESS21_DRV_SEL_I2C
Definition: brushless21.h:195
BRUSHLESS21_MAP_MIKROBUS
#define BRUSHLESS21_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: brushless21.h:178
brushless21_get_vbb_voltage
err_t brushless21_get_vbb_voltage(brushless21_t *ctx, float *vbb_voltage)
Brushless 21 get vbb voltage function.
BRUSHLESS21_OK
@ BRUSHLESS21_OK
Definition: brushless21.h:252