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mikroSDK Library

Knob G click

Rating:

6

Author: MikroElektronika Team

Last Updated: 2018-10-12

Category: Rotary encoder

Downloaded: 684 times

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License: MIT license  

The Knob G click is a Click Board which features a combination of high-quality quadrature rotary encoder, and a LED ring composed of 24 individual green LEDs.

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mikroSDK Library Blog

Knob G click

Knob G click

Native view of the Knob G click board.

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Knob G click

Knob G click

Front and back view of the Knob G click board.

View full image

Library Description

The library initializes and defines the I2C bus driver and drivers that offer a choice for writing data in the register and reads data from the register. The library includes the function for reading the Encoder position and sets a new start position. The user also has the functions for full control LEDs.

Key functions:

  • void knobg_setLedState(uint8_t led, uint8_t state) - Functions for setting the led state
  • void knobg_getEncoderPosition(int32_t *position, uint8_t *dir) - Functions for getting Encoder position
  • void knobg_encoderNewStartPosition(int32_t position) - Functions for set new start encoder position

Examples description

The application is composed of the three sections :

  • System Initialization - Initializes I2C module, sets INT pin, AN pin and CS pin as INPUT and sets RST pin and PWM pin as OUTPUT
  • Application Initialization - Initialization driver init, reset the device, enable led output, set output gain on maximum and sets new start position of the encoder.
  • Application Task - (code snippet) - The Task application has 3 test modes: * The first example is setting BRIGHTNESS on all LEDs. * Other examples put the LED in the position read from the encoder. * The third example sets the LED to be read while the encoder registers the clockwise movement and turn off those LEDs that the encoder reads when moving in a counterclockwise direction. * The example is changed by pressing the SW button
void applicationTask()
{
    knobg_getEncoderPosition(&encoder_newPosition, &direction);
    
    if(knobg_getSWButtonState() == 0)
    {
        SW_State++;
        if(SW_State >= 3) SW_State = 0;
        
        knobg_setBrightness(_KNOBG_BRIGHTNESS_ALL_LED, 0x00);
        Delay_ms( 300 );
    }
    
    /* Logs position */
    if(encoder_newPosition != encoder_oldPosition)
    {
        WordToStr(encoder_newPosition, demoText);
        mikrobus_logWrite(" EnCoder position : ", _LOG_TEXT);
        mikrobus_logWrite(demoText, _LOG_LINE);
    }
    encoder_oldPosition = encoder_newPosition;
    
    switch(SW_State)
    {
        /* Brightness */
        case 0:
        {
            cnt++;
            if(cnt > 127) cnt = 0;
            knobg_setBrightness(_KNOBG_BRIGHTNESS_ALL_LED, cnt);
            Delay_ms( 15 );
            break;
        }
        /* Encoder with one led*/
        case 1:
        {
            if(encoder_newPosition > 24) knobg_encoderNewStartPosition( 1 );
            if(encoder_newPosition < 1) knobg_encoderNewStartPosition( 24 );

            if(direction == 1)
            {
                knobg_setLedState(encoder_newPosition, _KNOBG_LED_ON);
                knobg_setLedState(encoder_newPosition - 1, _KNOBG_LED_OFF);
            }
            else
            {
                knobg_setLedState(encoder_newPosition, _KNOBG_LED_ON);
                knobg_setLedState(encoder_newPosition + 1, _KNOBG_LED_OFF);
            }
            Delay_1ms();
            break;
        }
        /* Encoder with all led */
        case 2:
        {
            if(encoder_newPosition > 24) knobg_encoderNewStartPosition( 1 );
            if(encoder_newPosition < 1) knobg_encoderNewStartPosition( 24 );
            
            if(direction == 1)
            {
                knobg_setLedState(encoder_newPosition, _KNOBG_LED_ON);
            }
            else
            {
                knobg_setLedState(encoder_newPosition + 1, _KNOBG_LED_OFF);
            }
            Delay_1ms();
            break;
        }
    }

}

Other mikroE Libraries used in the example:

  • I2C

Additional notes and information

Depending on the development board you are using, you may need USB UART clickUSB 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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