Ambient 16 Click is a compact add-on board used to measure the amount of the present ambient light. This board features the BH1726NUC, a 16-bit digital-output ambient light sensor with an I2C interface from Rohm Semiconductor. The BH1726NUC can detect a wide range of illuminance up to 30klx and provides excellent responsivity close to the human eyes' response. It is designed to control the brightness in various applications based on ambient light availability, brightness for optimum visibility, and energy efficiency. Operation in a temperature range of -40°C to 85°C ensures stable operation under extreme conditions. This Click board™ is the most suitable for obtaining ambient light data for adjusting brightness in applications that require power saving and better visibility.

Ambient 16 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Ambient 16 Click as its foundation uses the BH1726NUC, a 16-bit digital-output ambient light sensor from Rohm Semiconductor. The BH1726NUC can detect a wide range of illuminance up to 30klx and provides an excellent responsivity close to the response of human eyes. It also has stable performance over a wide temperature range of -40°C to 85°C, and a voltage range suitable to measure the amount of the present ambient light.

The BH1726NUC is designed to control the brightness in various applications based on ambient light availability, brightness for optimum visibility, and energy efficiency. This IC can change its ambient-light sensitivity used to compensate for the effect of attenuation by the optical window. Adjustment is made by changing the measurement time. For example, when the transmission rate of the optical window is 1/n (measurement result becomes 1/n times if the optical window is set), the effect of the optical window is compensated by changing sensor sensitivity from default to n times.

Ambient 16 Click communicates with 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. Besides, the BH1726NUC allows choosing the least significant bit (LSB) of its I2C peripheral address using the SMD jumper labeled ADDR SEL. It also possesses an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket labeled as INT, indicating when a specific interrupt event occurs.

This Click board™ can be operated only with 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.

• Interface: I²C
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V
• Illuminance Measurement Range: Min. 0 Ix, Max. 30,000 Ix
• Sensitivity Variations: ±15%
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +85°C

• Schematic
• BH1726NUC Datasheet
• mikroSDK
• GitHub