LightRanger 12 Click

How does it work?

LightRanger 12 Click with VL53L8CH Time-of-Flight Sensor

LightRanger 12 Click is based on the VL53L8CH, an 8x8 multizone Time-of-Flight (ToF) sensor from STMicroelectronics, designed for AI applications with exceptional performance under ambient light conditions. This sensor offers a wide 65° diagonal field of view (45° x 45° square), making it ideal for precise distance measurement and spatial mapping applications. It introduces a Compact and Normalized Histogram (CNH) data output format, specifically made for artificial intelligence applications that demand multizone raw data from a high-performance optical sensor, including AI-driven robotics, smart appliances like coffee machines and beverage dispensers, smart home solutions, and advanced recognition systems.

The VL53L8CH integrates a powerful new-generation Vertical-Cavity Surface-Emitting Laser (VCSEL) and two advanced metasurface lenses, enhancing its optical capabilities. The VCSEL emits an invisible 940 nm IR light that is Class 1 certified, ensuring eye safety while maintaining high performance. It also provides unparalleled flexibility by allowing users to configure up to 64 zones (8x8 grid), adjust histogram resolution to 128 bins, and define bin widths. Each zone's infrared signal is transmitted to the host as raw histogram data, complementing the standard ToF sensor outputs, such as ranging distances up to 400 cm, signal levels, and reflectance.

By combining raw histogram data with traditional ranging capabilities, the VL53L8CH unlocks endless possibilities beyond standard distance measurement. It can detect and differentiate between solid materials like carpet, wood, glass, mirrors and fluids such as water, oil, or chemicals. This makes it possible to identify the location and size of a cup in coffee machines or beverage dispensers, detect floor materials for robotic navigation, or develop advanced AI-driven features like gesture motion recognition, hand posture detection, and even shape or motion analysis. Additionally, the sensor is suited for applications like people counting in smart homes and buildings.

Sensor data are accessed through the I2C or SPI interface, with a maximum frequency of 1MHz for I2C and 3MHz for SPI communication. The selection is made by positioning SMD jumpers labeled COMM SEL appropriately. Note that all the jumpers' positions must be on the same side, or the Click board™ may become unresponsive.

In addition to the interface pins, this board uses several other pins. The SNC pin on the mikroBUS™ socket offers dual functionality: it can serve as a synchronization input, enabling the sensor to align its measurements with external events or signals for precise timing and coordination in applications requiring high accuracy, or it can act as a general-purpose open-drain input/output pin, providing added versatility for control or signaling tasks tailored to specific application needs. The LP pin allows users to toggle the I2C communication ON or OFF while in low-power mode, which is particularly useful for changing the I2C address in multi-device systems. Lastly, the INT pin provides an interrupt signal to indicate when a ranging measurement is available, ensuring data handling and real-time responsiveness.

The VL53L8CH does not require a specific Power-Up sequence but requires a voltage of 1.8V for its interface and logic part to work correctly. Therefore, a small regulating LDO, the AP2112, provides a 1.8V out of selected mikroBUS™ power rail. Since the sensor operates on 1.8V, this Click board™ also features the TXB0108E voltage-level translator, allowing the VL53L8CH to work properly with 3.3V and 5V MCU.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use 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 LightRanger 12 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Synchronization / GPIO	SNC	1	AN	PWM	16	LP	Low Power I2C Enable
ID SEL	RST	2	RST	INT	15	INT	Interrupt
SPI Select / ID COMM	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
SPI Data OUT	SDO	5	MISO	SCL	12	SCL	I2C Clock
SPI Data IN	SDI	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

LightRanger 12 Click electrical specifications

Software Support

LightRanger 12 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of LightRanger 12 Click board by reading and displaying 8x8 zones measurements on the USB UART.

Key Functions

• lightranger12_cfg_setup Config Object Initialization function.
• lightranger12_init Initialization function.
• lightranger12_default_cfg Click Default Configuration function.
• lightranger12_get_int_pin This function returns the INT (interrupt) pin logic state.
• lightranger12_get_resolution This function gets the current resolution (4x4 or 8x8).
• lightranger12_get_ranging_data This function gets the ranging data, using the selected output and the resolution.

Application Init

Initializes the driver and performs the Click default configuration.

Application Task

Reads all zone measurements approximately every 200ms and logs them to the USB UART as an 8x8 map. The silicon temperature measurement in degrees Celsius is also displayed.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.