Analog MUX 4 Click

Analog MUX 4 Click is a compact add-on board that switches one of many analog inputs to one digital output. This board features the TMUX1308, a general-purpose 8:1 single-ended CMOS multiplexer (MUX) from Texas Instruments. The TMUX1308 has an internal injection current control which eliminates the need for external diode and resistor networks to protect the switch and keep the input signals within the supply voltage. It also supports bidirectional analog and digital signals ranging from 0 to 5V, alongside several protection features allowing a reliable operation and protecting the device from potential damage.

Click Product page

Click library

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

Software Support

We provide a library for the AnalogMUX4 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 AnalogMUX4 Click driver.

Standard key functions :

• analogmux4_cfg_setup Config Object Initialization function.

  void analogmux4_cfg_setup ( analogmux4_cfg_t *cfg );

• analogmux4_init Initialization function.

  err_t analogmux4_init ( analogmux4_t *ctx, analogmux4_cfg_t *cfg );

Example key functions :

• analogmux4_enable_input This function enables analog inputs.

  void analogmux4_enable_input ( analogmux4_t *ctx )

• analogmux4_read_an_pin_voltage This function reads results of AD conversion of the AN pin and converts them to proportional voltage level.

  err_t analogmux4_read_an_pin_voltage ( analogmux4_t *ctx, float *data_out );

• analogmux4_set_input_channel This function sets the analog input channel.

  void analogmux4_set_input_channel ( analogmux4_t *ctx, uint8_t channel );

Example Description

This example demonstrates the use of Analog MUX 4 Click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and enables the analog inputs.

void application_init ( void )
{
    log_cfg_t log_cfg;                /**< Logger config object. */
    analogmux4_cfg_t analogmux4_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.
    analogmux4_cfg_setup( &analogmux4_cfg );
    ANALOGMUX4_MAP_MIKROBUS( analogmux4_cfg, MIKROBUS_1 );
    if ( ADC_ERROR == analogmux4_init( &analogmux4, &analogmux4_cfg ) )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    analogmux4_enable_input ( &analogmux4 );
    log_info( &logger, " Application Task " );
}

Application Task

Reads and displays the voltage of all channels on the USB UART approximately once per second.

void application_task ( void )
{
    float analogmux4_an_voltage = 0;

    for ( uint8_t cnt = ANALOGMUX4_CHANNEL_0; cnt <= ANALOGMUX4_CHANNEL_7; cnt++ )
    {
        analogmux4_set_input_channel ( &analogmux4, cnt );
        if ( ADC_ERROR != analogmux4_read_an_pin_voltage ( &analogmux4, &analogmux4_an_voltage ) ) 
        {
            log_printf( &logger, " AN%u voltage : %.3f V\r\n", ( uint16_t ) cnt, analogmux4_an_voltage );
        }
    }
    log_printf( &logger, "\r\n" );
    Delay_ms ( 1000 );
}

Note

The channel's voltage will "float" when the voltage source is not connected to it.

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.AnalogMUX4

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.