Capture, analyze, and optimize movement with ADXL314 and PIC18F47K42TQFP like never before
Unraveling motion's secrets in every direction
Published Feb 13, 2024
Click board™
Accel 29 Click
Dev Board
Curiosity Nano with PIC18F47K42
Compiler
NECTO Studio
MCU
PIC18F47K42TQFP
Elevate your projects and enhance connectivity with our 3D accelerometer, ushering in an era of improved data accuracy and responsiveness
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Hardware Overview
How does it work?
Accel 29 Click is based on the ADXL314, a complete three-axis ±200g acceleration measurement system from Analog Devices, operating at low power levels. The ADXL314 measures both dynamic accelerations resulting from motion or shock and static accelerations, such as gravity. It provides digital output data formatted as 16-bit, with acceleration reported digitally through a configurable and selectable serial interface. The ADXL314 automatically modulates its power consumption proportionately to its output data rate. If additional power savings are desired, it also offers lower power modes, enabling intelligent motion-based power management with threshold sensing and active acceleration measurement at low power dissipation. The ADXL314 is based on a polysilicon surface-micromachined structure built on top of a silicon wafer that suspends the
structure over the surface of the wafer, providing resistance against forces due to applied acceleration. Deflection of the structure is measured using differential capacitors that consist of independent fixed plates and plates attached to the moving mass. Acceleration deflects the proof mass and unbalances the differential capacitor, producing a sensor output whose amplitude is proportional to acceleration. Phase-sensitive demodulation is used to determine the magnitude and polarity of the acceleration. As mentioned, the acceleration data is accessed through the I2C or SPI interface with a maximum frequency of 400kHz for I2C and 5MHz 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. While the I2C interface is selected, the ADXL314 allows choosing the least significant bit (LSB) of its I2C slave address using the SMD jumper labeled ADDR SEL. This board also possesses two interrupts, IT1 and IT2, routed to, where, by default, the AN and IT pins stand on the mikroBUS™ socket, entirely programmed by the user through a serial interface. They signal MCU that a motion event has been sensed. 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. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Features overview
Development board
PIC18F47K42 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate the PIC18F47K42 microcontroller (MCU). Central to its design is the inclusion of the powerful PIC18F47K42 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive mechanical user switch
providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI GPIO), offering extensive connectivity options.
Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 2.3V to 5.1V (limited by USB input voltage), with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC
MCU Memory (KB)
128
Silicon Vendor
Microchip
Pin count
40
RAM (Bytes)
8192
You complete me!
Accessories
Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F47K42 as your development board.
Track your results in real time
Application Output
After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.
After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.
Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.
Software Support
Library Description
This library contains API for Accel 29 Click driver.
Key functions:
accel29_calibrate_offset- This function calibrates accel offset to the specified values by setting the OFSX/Y/Z registersaccel29_get_avg_axes- This function reads a specified number of samples for accel X, Y, and Z axis data in g and averages them
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* @file main.c
* @brief Accel 29 Click example
*
* # Description
* This example demonstrates the use of Accel 29 click board by reading and
* displaying the accelerometer data (X, Y, and Z axis) averaged from 100 samples.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver, performs the click default configuration, and calibrates
* the accel data offsets.
*
* ## Application Task
* Reads and displays on the USB UART the accelerometer data (X, Y, and Z axis)
* averaged from 100 samples.
*
* @note
* This click board should be used for high g applications of up to +-200g.
* It is not recommended for low g applications because of its high scale
* factor which is about 48.83 mg per LSB.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "accel29.h"
/**
* Starting accel position, used for calibrating accel offset.
* Should be in a range from -24.96 to 24.765 g.
* Offset calibrating scale factor is 0.195 g per LSB.
*/
#define ACCEL29_CALIB_X 0.0f
#define ACCEL29_CALIB_Y 0.0f
#define ACCEL29_CALIB_Z 1.0f
static accel29_t accel29;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
accel29_cfg_t accel29_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
accel29_cfg_setup( &accel29_cfg );
ACCEL29_MAP_MIKROBUS( accel29_cfg, MIKROBUS_1 );
err_t init_flag = accel29_init( &accel29, &accel29_cfg );
if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( ACCEL29_ERROR == accel29_default_cfg ( &accel29 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
accel29_axes_t calib_axes;
calib_axes.x = ACCEL29_CALIB_X;
calib_axes.y = ACCEL29_CALIB_Y;
calib_axes.z = ACCEL29_CALIB_Z;
if ( ACCEL29_ERROR == accel29_calibrate_offset ( &accel29, calib_axes ) )
{
log_error( &logger, " Calibrate offset." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
accel29_axes_t axes;
if ( ACCEL29_OK == accel29_get_avg_axes ( &accel29, ACCEL29_NUM_OF_SAMPLES, &axes ) )
{
log_printf( &logger, " X: %.1f g\r\n", axes.x );
log_printf( &logger, " Y: %.1f g\r\n", axes.y );
log_printf( &logger, " Z: %.1f g\r\n\n", axes.z );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
