ambient21  2.1.0.0
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Ambient 21 click

Ambient 21 Click is a compact add-on board used to measure the amount of the present ambient light. This board features ams AG's TSL2591, a very-high sensitivity light-to-digital converter that transforms light intensity to a digital signal output capable of the direct I2C interface. It combines one broadband photodiode (visible plus infrared) and one infrared-responding photodiode on a single CMOS integrated circuit, providing a flexible and wide operating range of up to 88klx with an excellent responsivity close to the human eyes' response. The TSL2591 also has a programmable interrupt function and an integrated filter to reduce unwanted IR signals from the environment, improving lux accuracy across various light sources.

click Product page


Click library

  • Author : Stefan Filipovic
  • Date : Jan 2023.
  • Type : I2C type

Software Support

We provide a library for the Ambient 21 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 Ambient 21 Click driver.

Standard key functions :

Example key functions :

  • ambient21_get_int_pin This function returns the INT pin logic state.
  • ambient21_read_raw_data This function checks if the data is ready and then reads the raw ADC data from two channels.
    err_t ambient21_read_raw_data ( ambient21_t *ctx, uint16_t *ch_0, uint16_t *ch_1 );
  • ambient21_measure_light_level This function reads the raw ADC data from two channels and then measures the light level in lux based on those readings.
    err_t ambient21_measure_light_level ( ambient21_t *ctx, uint16_t *lux );

Example Description

This example demonstrates the use of Ambient 21 click board by measuring the ambient light level in Lux.

The demo application is composed of two sections :

Application Init

Initializes the driver and performs the click default configuration.

void application_init ( void )
{
log_cfg_t log_cfg;
ambient21_cfg_t ambient21_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
ambient21_cfg_setup( &ambient21_cfg );
AMBIENT21_MAP_MIKROBUS( ambient21_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == ambient21_init( &ambient21, &ambient21_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( AMBIENT21_ERROR == ambient21_default_cfg ( &ambient21 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}

Application Task

Waits for the data ready interrupt, then reads the ambient light level in Lux

and displays the results on the USB UART. By default, the data ready interrupt triggers upon every ADC cycle which occurs every 200ms.

void application_task ( void )
{
uint16_t lux;
if ( !ambient21_get_int_pin ( &ambient21 ) )
{
if ( AMBIENT21_OK == ambient21_measure_light_level ( &ambient21, &lux ) )
{
log_printf ( &logger, " Ambient light level [Lux]: %u\r\n\n", lux );
}
}
}

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.Ambient21

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.


ambient21_measure_light_level
err_t ambient21_measure_light_level(ambient21_t *ctx, uint16_t *lux)
Ambient 21 measure light level function.
AMBIENT21_OK
@ AMBIENT21_OK
Definition: ambient21.h:267
ambient21_cfg_t
Ambient 21 Click configuration object.
Definition: ambient21.h:250
ambient21_cfg_setup
void ambient21_cfg_setup(ambient21_cfg_t *cfg)
Ambient 21 configuration object setup function.
application_task
void application_task(void)
Definition: main.c:66
ambient21_get_int_pin
uint8_t ambient21_get_int_pin(ambient21_t *ctx)
Ambient 21 get int pin function.
AMBIENT21_MAP_MIKROBUS
#define AMBIENT21_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: ambient21.h:216
ambient21_init
err_t ambient21_init(ambient21_t *ctx, ambient21_cfg_t *cfg)
Ambient 21 initialization function.
ambient21_read_raw_data
err_t ambient21_read_raw_data(ambient21_t *ctx, uint16_t *ch_0, uint16_t *ch_1)
Ambient 21 read raw data function.
ambient21_default_cfg
err_t ambient21_default_cfg(ambient21_t *ctx)
Ambient 21 default configuration function.
application_init
void application_init(void)
Definition: main.c:30
AMBIENT21_ERROR
@ AMBIENT21_ERROR
Definition: ambient21.h:268
ambient21_t
Ambient 21 Click context object.
Definition: ambient21.h:229