analogkey  2.0.0.0
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Analog Key click

Analog Key Click is an analog keyboard on a Click board�. It contains six tactile pushbuttons, used to select one of six different voltage levels.

click Product page


Click library

  • Author : MikroE Team
  • Date : Dec 2019.
  • Type : ADC type

Software Support

We provide a library for the AnalogKey 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 AnalogKey Click driver.

Standard key functions :

Example key functions :

  • This function returns which button is pressed.

    uint8_t analogkey_get_key ( analogkey_t* ctx, uint16_t adc_value );

  • This function sets the resolution.

    void analogkey_set_resolution ( analogkey_t* ctx, uint8_t resolution );

Examples Description

This example logs which button is pressed.

The demo application is composed of two sections :

Application Init

Initializes driver.

void application_init ( void )
{
log_cfg_t log_cfg;
log_cfg.level = LOG_LEVEL_DEBUG;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
ANALOGKEY_MAP_MIKROBUS( cfg, MIKROBUS_1 );
analogkey_set_resolution( &analogkey, ANALOGKEY_ADC_RESOLUTION_12bit );
analogkey_init( &analogkey, &cfg );
Delay_ms( 100 );
log_printf(&logger, " Press the button :D\r\n ");
}

Application Task

Reads ADC value and detects which button is pressed based on that value.

void application_task ( void )
{
float an_voltage = 0;
float an_average = 0;
an_voltage = analogkey_read_voltage( &analogkey );
if ( an_voltage > 0.2 )
{
an_average += an_voltage / ANALOGKEY_N_SAMPLES;
for ( uint8_t cnt = 0; cnt < ANALOGKEY_N_SAMPLES - 1; cnt++ )
{
an_voltage = analogkey_read_voltage( &analogkey );
an_average += an_voltage / ANALOGKEY_N_SAMPLES;
}
}
if ( ( key = analogkey_get_key( &analogkey, an_average ) ) != ANALOGKEY_TOUCH_KEY_NONE )
{
log_printf( &logger, " T%u is pressed.\r\n", (uint16_t)key );
while ( analogkey_read_voltage( &analogkey ) > 0.2 ) {
Delay_ms( 1 );
}
log_printf( &logger, " T%u is released.\r\n", (uint16_t)key );
Delay_ms( 10 );
}
}

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.AnalogKey

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.


analogkey_read_voltage
float analogkey_read_voltage(analogkey_t *ctx)
Generic read function.
analogkey_key_id_t
analogkey_key_id_t
Click touch key definition.
Definition: analogkey.h:68
application_task
void application_task(void)
Definition: main.c:58
ANALOGKEY_TOUCH_KEY_NONE
@ ANALOGKEY_TOUCH_KEY_NONE
Definition: analogkey.h:69
analogkey_cfg_setup
void analogkey_cfg_setup(analogkey_cfg_t *cfg)
Config Object Initialization function.
analogkey_init
err_t analogkey_init(analogkey_t *ctx, analogkey_cfg_t *cfg)
Initialization function.
ANALOGKEY_N_SAMPLES
#define ANALOGKEY_N_SAMPLES
Definition: main.c:26
analogkey_get_key
analogkey_key_id_t analogkey_get_key(analogkey_t *ctx, float an_value)
Detects which button is pressed.
application_init
void application_init(void)
Definition: main.c:35
analogkey_cfg_t
Click configuration structure definition.
Definition: analogkey.h:94
ANALOGKEY_MAP_MIKROBUS
#define ANALOGKEY_MAP_MIKROBUS(cfg, mikrobus)
Definition: analogkey.h:53