servo

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Servo Click

Servo Click is a 16-channel PWM servo driver with the voltage sensing circuitry. It can be used to simultaneously control 16 servo motors, each with its own programmable PWM signal.

Click Product page

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Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : I2C type

Software Support

We provide a library for the Servo 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Servo Click driver.

Standard key functions :

• Config Object Initialization function.

void servo_cfg_setup ( servo_cfg_t *cfg );

• Initialization function.

SERVO_RETVAL servo_init ( servo_t *ctx, servo_cfg_t *cfg );

• Click Default Configuration function.

void servo_default_cfg ( servo_t *ctx );

Example key functions :

• This function settings Vref of Servo Clicks.

void servo_set_vref ( servo_t *ctx, uint16_t v_ref );

• This function sets position.

void servo_set_position ( servo_t *ctx, uint8_t motor, uint8_t position );

• This function reads the current value of Servo Click witch motor spends.

uint16_t setvo_get_current ( servo_t *ctx, uint8_t channel );

Examples Description

This app shows how the servo motor can be controled by the Click board.

The demo application is composed of two sections :

Application Init

Initializes device.

void application_init ( void )
{
    log_cfg_t log_cfg;
    servo_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    servo_cfg_setup( &cfg );
    SERVO_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    servo_init( &servo, &cfg );
    
    servo_default_cfg( &servo );
}
  

Application Task

The servo motor at CH1 rotate in clockwise and counter clockwise directions.

void application_task ( void )
{
    log_printf( &logger, "<<< Counter clockwise >>>\r\n" );
    Delay_1sec( );
    
    for ( cnt = servo.min_pos; cnt <= servo.max_pos; cnt++ )
    {
        servo_set_position( &servo, SERVO_MOTOR_1, cnt );
        log_printf( &logger, "Position : %u \r\n", ( uint16_t ) cnt );
        Delay_10ms( );
    }
    
    log_printf( &logger, "-----------------------------\r\n" );
    
    log_printf( &logger, "<<< Clockwise >>>\r\n" );
    Delay_1sec( );
    
    for ( cnt = servo.max_pos; cnt >= servo.min_pos; cnt-- )
    {
        servo_set_position( &servo, SERVO_MOTOR_1, cnt );
        log_printf( &logger, "Position : %u \r\n", ( uint16_t ) cnt );
        Delay_10ms( );
    }
} 

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Servo

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.

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