mux4  2.0.0.0
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MUX 4 click

MUX 4 Click is a compact add-on board that contains a precise analog multiplexing IC. This board features the 74HC4851, 8-channel analog multiplexer/demultiplexer with injection-current effect control from Nexperia USA Inc.

click Product page


Click library

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

Software Support

We provide a library for the MUX4 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 MUX4 Click driver.

Standard key functions :

Example key functions :

  • mux4_read_an_pin_voltage This function reads results of AD conversion of the AN pin and converts them to proportional voltage level.
    err_t mux4_read_an_pin_voltage ( mux4_t *ctx, float *data_out );
  • mux4_enable_input This function enable or disables analog inputs.
    void mux4_enable_input ( mux4_t *ctx, uint8_t en_state );
  • mux4_select_input This function selects which input channel signal is being forwarded to the AN/EXT pin.
    void mux4_select_input ( mux4_t *ctx, uint8_t input );

Example Description

This example demonstrates the use of MUX 4 click board.

The demo application is composed of two sections :

Application Init

Initializes the driver and enables analog inputs.

void application_init ( void )
{
log_cfg_t log_cfg;
mux4_cfg_t mux4_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
Delay_ms ( 100 );
log_info( &logger, " Application Init " );
// Click initialization.
mux4_cfg_setup( &mux4_cfg );
MUX4_MAP_MIKROBUS( mux4_cfg, MIKROBUS_1 );
if ( ADC_ERROR == mux4_init( &mux4, &mux4_cfg ) )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
}

Application Task

Reads the voltage from all input channels and displays the values of each channel on the USB UART approximately every second.

void application_task ( void )
{
float mux4_an_voltage = 0;
for ( uint8_t cnt = MUX4_SELECT_INPUT_1; cnt <= MUX4_SELECT_INPUT_8; cnt++ )
{
mux4_select_input( &mux4, cnt );
Delay_ms ( 10 );
if ( ADC_ERROR != mux4_read_an_pin_voltage ( &mux4, &mux4_an_voltage ) )
{
log_printf( &logger, " CH%u Voltage : %.3f V\r\n", ( uint16_t ) cnt, mux4_an_voltage );
}
}
log_printf( &logger, " ----------------------------\r\n" );
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.MUX4

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.


mux4_select_input
void mux4_select_input(mux4_t *ctx, uint8_t input)
MUX 4 select input function.
mux4_read_an_pin_voltage
err_t mux4_read_an_pin_voltage(mux4_t *ctx, float *data_out)
MUX 4 read AN pin voltage level function.
mux4_enable_input
void mux4_enable_input(mux4_t *ctx, uint8_t en_state)
MUX 4 enable input function.
MUX4_SELECT_INPUT_1
#define MUX4_SELECT_INPUT_1
MUX 4 select input flags.
Definition: mux4.h:80
application_task
void application_task(void)
Definition: main.c:62
MUX4_ENABLE_INPUT
#define MUX4_ENABLE_INPUT
MUX 4 enable input flags.
Definition: mux4.h:73
MUX4_MAP_MIKROBUS
#define MUX4_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: mux4.h:105
mux4_t
MUX 4 Click context object.
Definition: mux4.h:120
application_init
void application_init(void)
Definition: main.c:28
mux4_init
err_t mux4_init(mux4_t *ctx, mux4_cfg_t *cfg)
MUX 4 initialization function.
MUX4_SELECT_INPUT_8
#define MUX4_SELECT_INPUT_8
Definition: mux4.h:87
mux4_cfg_setup
void mux4_cfg_setup(mux4_cfg_t *cfg)
MUX 4 configuration object setup function.
mux4_cfg_t
MUX 4 Click configuration object.
Definition: mux4.h:135