HOW DOES IT WORK?

LightRanger 7 Click is based on the AFBR-S50, a multi-pixel optical distance and motion measurement sensor module based on the Time-of-Flight principle from Broadcom. The AFBR-S50 is developed with a particular focus on applications with the need for the highest speed and accuracy at medium distance ranges with low power consumption. Due to its best-in-class ambient light suppression, use in outside environments is possible in direct sunlight and on white, black, colored, metallic, and retroreflective surfaces. This feature makes it suitable for optical distance measurements requiring precise 3D information and extended range like drones or AMR/AGV.

This board represents an integrated solution consisting of a 32-bit MCU, RA4M2 group of Renesas MCU with Arm® Cortex®-M33 core, and a ToF sensor with an integrated infrared laser light source mounted on a compact-sized PCB. In addition to an SPI-compatible interface for data transferring to the RA4M2 MCU, the AFBR-S50 also has an interrupt line through which the MCU can register the data-ready event. Also, such conditions and other interrupts can be visually represented using the yellow LED indicator marked with STATUS. The RA4M2 interfaces with a host MCU through UART communication via commonly used RX and TX mikorBUS™ pins.

Since the AFBR-S50 is known to be used in both robotics and drones, it is essential to note that this ToF sensor is compatible with Pixhawk®, a popular general-purpose flight controller, accessible via two 4-pin CAN connectors, J1 and J2, and controllable through onboard CAN controller, the MCP2542WFD from Microchip. Also, there is a clear visual indication of the execution of the communication itself; more precisely, the user can catch the operation of CAN communication/signal transfer via orange LED indicators provided for indication of received and transmitted CAN signals.

In addition, this board also offers complete debugging and programming capabilities supported through an additional header marked with J3. With this header, the user can use a Serial Wire Debug interface for programming and debugging, available through the SWD interface pins. Besides, it also has a Micro B USB connector, allowing the board to be powered and configured by a personal computer (PC). This way, it is possible to flash the AFBR-S50 ToF sensor via bootloader simply.

NOTE: Unlike the BDC-AFBR-S50 TOF Sensor board, which works with the corresponding code that supports USB and CAN communication, this Click board™ comes with a code version that supports USB and UART communication as default, while CAN communication is left as an option for the user. Thanks to the mentioned bootloader, the user can upgrade/degrade the example code and use the code version of the BDC-AFBR-S50 TOF Sensor board on the Click board™.

This Click board™ uses both mikroBUS™ power rails, 3.3V, and 5V. 5V is necessary to power the ToF sensor, while all unnecessary communication and data transfer is done using 3.3V logic. Thanks to the onboard LDO regulator, the SPX3819, even in the standalone CAN configuration, both voltages are provided: 5V through the CAN connector, while the regulator creates a voltage of 3.3V essential for the proper operation of the MCU. 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