Capture motion data in three dimensions with BMA456 and PIC32MZ2048EFH100

Accel 11 Click is based on the BMA456, a digital triaxial acceleration sensor from Bosch Sensortec. This sensor has many features ideally suited for wearables, handheld, and IoT applications, offering a good balance between the performance and the power consumption. One of its key features is its extremely low power consumption, which makes it perfectly suited for such applications. There are several power modes that the BMA456 device can use. While in Low Power mode, the device consumes the least power, but access to some features is restricted. More information can be found within the BMA456 datasheet. The BMA456 sensor can measure acceleration within ranges of ±2 g, ±4 g, ±8, and ±16 g. It can output the measurement data using the Output Data Rate (ODR) from 0.78Hz (Low Power mode) up to 1600Hz (Performance mode). A high-precision analog front end facilitates highly sensitive MEMS, featuring a 16-bit A/D Converter. It allows very high output accuracy, even during low amplitude changes. This makes the sensor particularly sensitive and accurate with movements that

generate relatively low acceleration signals. However, using a highly sensitive MEMS makes the BMA456 prone to damage caused by extremely high g-forces (10,000g for less than 200µs). Acceleration data is available in 16-bit format from the data registers and the internal FIFO buffer of 1kb. The FIFO buffer can be used for more complex calculations or timed readings, reducing the traffic on the communication interface. The interrupt engine facilitates the FIFO buffer, triggering an interrupt for two FIFO events: the watermark event and the FIFO buffer full event. FIFO buffer allows optimization within the firmware that runs on the host MCU. Besides the acceleration MEMS and complementary analog front-end circuit, the BMA456 sensor has an integrated temperature sensor. It is updated every 1.2s and sampled to an 8-bit value (complement of 2’s format). Interrupts can be triggered for many different events. Some basic events include the data-ready interrupt event and aforementioned FIFO events, while so-called feature engines can trigger an interrupt for any of the detected

motion/movement events, including step detection/counter, activity recognition, tilt on the wrist, tap/double tap, any/no motion, and error event interrupt. The extensive interrupt engine can use two programmable interrupt pins. Depending on settings in appropriate registers, these pins can be assigned with any interrupt source and can be either LOW or HIGH on interrupt. These two pins are routed to the INT and AN pin of the mikroBUS™ and are labeled IT1 and IT2, respectively. Accel 11 click offers two communication interfaces. It can be used with either I2C or SPI. The onboard SMD jumpers labeled COMM SEL allow switching between the two interfaces. Note that all the jumpers must be positioned in the I2C or SPI position. When the I2C interface is selected, an additional SMD jumper labeled ADDR SEL becomes available, determining the least significant bit of the BMA456 I2C address. The Click board™ should be interfaced only with MCUs that use logic levels of 3.3V.

Flip&Click PIC32MZ is a compact development board designed as a complete solution that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit PIC32MZ microcontroller, the PIC32MZ2048EFH100 from Microchip, four mikroBUS™ sockets for Click board™ connectivity, two USB connectors, LED indicators, buttons, debugger/programmer connectors, and two headers compatible with Arduino-UNO pinout. Thanks to innovative manufacturing technology,

it allows you to build gadgets with unique functionalities and features quickly. Each part of the Flip&Click PIC32MZ development kit contains the components necessary for the most efficient operation of the same board. In addition, there is the possibility of choosing the Flip&Click PIC32MZ programming method, using the chipKIT bootloader (Arduino-style development environment) or our USB HID bootloader using mikroC, mikroBasic, and mikroPascal for PIC32. This kit includes a clean and regulated power supply block through the USB Type-C (USB-C) connector. All communication

methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, user-configurable buttons, and LED indicators. Flip&Click PIC32MZ development kit allows you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.