fan8

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FAN 8 Click

FAN 8 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : Stefan Filipovic
• Date : Aug 2021.
• Type : I2C type

Software Support

Example Description

This example demonstrates the use of FAN 8 Click board.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.FAN8

Example Key Functions

• fan8_cfg_setup Config Object Initialization function.

void fan8_cfg_setup ( fan8_cfg_t *cfg );

• fan8_init Initialization function.

err_t fan8_init ( fan8_t *ctx, fan8_cfg_t *cfg );

• fan8_default_cfg Click Default Configuration function.

err_t fan8_default_cfg ( fan8_t *ctx );

• fan8_set_duty_cycle This function sets the duty cycle of the selected fan channel and waits until the duty cycle is set at the PWM output.

err_t fan8_set_duty_cycle ( fan8_t *ctx, uint8_t fan_ch, uint8_t duty_cycle );

• fan8_measure_rpm This function measures the RPM of the selected fan channel.

err_t fan8_measure_rpm ( fan8_t *ctx, uint8_t fan_ch, uint8_t num_pulses, uint16_t *fan_rpm );

• fan8_read_temperature This function reads the temperature from the thermistor attached to the selected temperature channel.

err_t fan8_read_temperature ( fan8_t *ctx, uint8_t temp_ch, float *temperature );

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;    /**< Logger config object. */
    fan8_cfg_t fan8_cfg;  /**< Click config object. */

    /** 
     * 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.
    fan8_cfg_setup( &fan8_cfg );
    FAN8_MAP_MIKROBUS( fan8_cfg, MIKROBUS_1 );
    err_t init_flag = fan8_init( &fan8, &fan8_cfg );
    if ( I2C_MASTER_ERROR == init_flag ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    init_flag = fan8_default_cfg ( &fan8 );
    if ( FAN8_ERROR == init_flag ) 
    {
        log_error( &logger, " Default Config Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

Application Task

Changes the speed of fans at both channels by changing the PWM duty cycle, then calculates the fans RPM from measured tachometer signal. It also reads the temperature of two thermistors. The results are being displayed to the USB UART where you can track their changes.

void application_task ( void )
{
    static uint8_t duty_cnt = FAN8_MIN_DUTY_CYCLE;
    static int8_t duty_inc = FAN8_DUTY_CYCLE_STEP_10;
    uint16_t fan_rpm = 0;
    float temperature = 0;
    
    if ( duty_cnt == FAN8_MAX_DUTY_CYCLE )
    {
        duty_inc = -FAN8_DUTY_CYCLE_STEP_10;
    }
    else if ( duty_cnt == ( FAN8_MIN_DUTY_CYCLE + FAN8_DUTY_CYCLE_STEP_10 ) )
    {
        duty_inc = FAN8_DUTY_CYCLE_STEP_10;
    }
    duty_cnt += duty_inc;
        
    log_printf( &logger, " - Channel 1 values -\r\n" );
    fan8_set_duty_cycle ( &fan8, FAN8_FAN_CHANNEL_1, duty_cnt );
    log_printf( &logger, " PWM Duty Cycle : %d\r\n", ( uint16_t ) duty_cnt );
    fan8_measure_rpm ( &fan8, FAN8_FAN_CHANNEL_1, FAN8_2_PULSES_PER_REVOLUTION, &fan_rpm );
    log_printf( &logger, " Last measured fan RPM : %u\r\n", fan_rpm );
    fan8_read_temperature ( &fan8, FAN8_TEMP_CHANNEL_1, &temperature );
    log_printf( &logger, " Temperature : %.2f C\r\n\r\n", temperature );
    
    log_printf( &logger, " - Channel 2 values -\r\n" );
    fan8_set_duty_cycle ( &fan8, FAN8_FAN_CHANNEL_2, duty_cnt );
    log_printf( &logger, " PWM Duty Cycle : %d\r\n", ( uint16_t ) duty_cnt );
    fan8_measure_rpm ( &fan8, FAN8_FAN_CHANNEL_2, FAN8_2_PULSES_PER_REVOLUTION, &fan_rpm );
    log_printf( &logger, " Last measured fan RPM : %u\r\n", fan_rpm );
    fan8_read_temperature ( &fan8, FAN8_TEMP_CHANNEL_2, &temperature );
    log_printf( &logger, " Temperature : %.2f C\r\n\r\n", temperature );
    
    if ( !fan8_check_fault_indicator ( &fan8 ) )
    {
        log_printf( &logger, " Fault detected!\r\n\r\n", temperature );
    }
    
    Delay_ms ( 500 );
}

Note

The MAX6615 measures the tachometer signal every 67s, therefore the fan RPM value will be updated once per 67s. An NTC 10K3 thermistor is required for proper temperature measurements.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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