Ambient 20 Click

How does it work?

Ambient 20 Click is based on the BU27030NUC, a high-sensitivity light-to-digital converter from Rohm Semiconductor that transforms light intensity into a digital output signal. The BU27030NUC provides ambient light sensing (ALS) that approximates the human eye response to light intensity under various lighting conditions and through different attenuation materials. It has a flexible and wide operating range of up to 20klx with a maximum resolution of 0.0007lux/count, even when mounted behind dark glass. The BU27030NUC also features inherent 50Hz/60Hz light noise rejection and excellent IR-cut characteristics, making this board most suitable for brightness control functions, helping to reduce power consumption.

Ambient 20 Click communicates with an MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting Standard Mode operation with a clock frequency of 100kHz and Fast Mode up to 400kHz. Despite its simple design, the BU27030NUC provides users with two outputs with different spectral responses. Thanks to the simplicity of the I2C interface, users can access not only the data of both outputs but also other configuration parameters such as the measurement mode of the desired output, gain settings, data update status, and the activation of the measurement process itself.

This Click board™ can only be operated from a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on Ambient 20 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Ambient 20 Click electrical specifications

Software Support

We provide a library for the Ambient 20 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Ambient 20 Click driver.

Key functions

• ambient20_sw_reset Software reset function.

• ambient20_set_gain Set data gain function.

• ambient20_read_data0 Read data0 function.

Example Description

This example demonstrates the use of Ambient 20 click board by measuring the ambient light level.

void application_task ( void )  
 { 
     //  Task implementation. 
     uint16_t data0, data1; 
     ambient20_read_data0( &ambient20, &data0 ); 
     ambient20_read_data1( &ambient20, &data1 ); 

     log_printf( &logger, "Data 0: %d rn", data0 ); 
     log_printf( &logger, "Data 1: %d rn", data1 ); 

     Delay_ms( 1000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Ambient20

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 Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK – Mikroe Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.