Turn your moves into tangible achievements with with LIS2DW12 and ATmega1284
Tri-Axis brilliance: Redefining motion tracking for the future
Published Oct 08, 2023
Click board™
Accel 10 Click
Dev Board
EasyAVR v7
Compiler
NECTO Studio
MCU
ATmega1284
Our three-axis accelerometer is engineered to revolutionize motion sensing, providing accurate and real-time measurements for a multitude of applications
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Hardware Overview
How does it work?
Accel 10 Click is based on the LIS2DW12TR, a high-performance ultra-low-power 3-axis "femto" accelerometer, from STMicroelectronics. This sensor has many features perfectly 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 which the LIS2DW12TR device can use. While in Low Power mode, the device consumes only 0.38µA, but the access to some features is restricted. Having that in mind, accel 10 Click can be used for a rapid development and testing of various applications based on step counting, fitness applications, profile switching and display ON/OFF applications, angle measurement applications, and similar applications. More information can be found within the LIS2DW12TR datasheet. The LIS2DW12TR 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 1.6Hz (Low Power mode), up to 1600Hz (Performance mode). A high-precision analog front end facilitates highly sensitive MEMS,
featuring a 14-bit A/D Converter. It allows very high accuracy of the output, even during very 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 LIS2DW12TR prone to damage caused by extremely high g-forces (10,000 g for less than 200 µs). Acceleration data is available in 14-bit format from both the data registers and the internal FIFO buffer, which can can memorize 32 slots of X, Y and Z data. The FIFO buffer can be used for more complex calculations or timed readings, reducing the traffic on the communication interface. FIFO buffer allows optimization within the firmware that runs on the host MCU. Besides the acceleration MEMS and complementary analog front-end circuit, the LIS2DW12TR sensor also has an integrated temperature sensor. It is updated up to 25 times per second, and sampled to an 12-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 wrist, tap/double tap, any/no motion, and error event interrupt. The extensive interrupt engine can use two programmable interrupt pins. Both of these pins can be assigned with any interrupt source and can be either LOW or HIGH on interrupt, depending on settings in appropriate registers. These two pins are routed to PWM and INT pin of the mikroBUS™, and are labeled as IT1 and IT2, respectively. Accel 10 Click offers two communication interfaces. It can be used with either I2C or SPI. The onboard SMD jumpers labeled as COMM SEL allow switching between the two interfaces. Note that all the jumpers have to be positioned either I2C or to SPI position. When I2C interface is selected, an additional SMD jumper labeled as ADDR SEL becomes available, determining the least significant bit of the LIS2DW12TR I2C address. This Click Board™ uses both I2C and SPI communication interfaces. It is designed to be operated only with 3.3V logic levels. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 5V.
Features overview
Development board
EasyAVR v7 is the seventh generation of AVR development boards specially designed for the needs of rapid development of embedded applications. It supports a wide range of 16-bit AVR microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyAVR v7 allows you to connect accessory boards, sensors, and custom electronics more
efficiently than ever. Each part of the EasyAVR v7 development board contains the components necessary for the most efficient operation of the same board. An integrated mikroProg, a fast USB 2.0 programmer with mikroICD hardware In-Circuit Debugger, offers many valuable programming/debugging options and seamless integration with the Mikroe software environment. Besides it also includes a clean and regulated power supply block for the development board. It can use a wide range of external power sources, including an external 12V power supply, 7-12V AC or 9-15V DC via DC connector/screw terminals, and a power source via the USB Type-B (USB-B)
connector. Communication options such as USB-UART and RS-232 are also included, alongside the well-established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets which cover a wide range of 16-bit AVR MCUs. EasyAVR v7 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
AVR
MCU Memory (KB)
128
Silicon Vendor
Microchip
Pin count
40
RAM (Bytes)
16384
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 EasyAVR v7 as your development board.
Track your results in real time
Application Output
After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.
Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.
In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".
The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.
Software Support
Library Description
This library contains API for Accel 10 Click driver.
Key functions:
accel10_check_data_ready- Check data ready functionaccel10_get_data- Read Accel data functionaccel10_read_temperature- Read temperature function
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
* \brief Accel10 Click example
*
* # Description
* This example demonstrates the use of Accel 10 click board.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and checks the communication by reading the device ID.
* After that, performs the click default configuration.
*
* ## Application Task
* Reads the accel values for X, Y, and Z axis and also reads the temperature in Celsius
* and displays the results on the USB UART each second.
*
* \author Nenad Filipovic
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "accel10.h"
// ------------------------------------------------------------------ VARIABLES
static accel10_t accel10;
static log_t logger;
static accel10_data_t accel_data;
static int8_t temperature;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
accel10_cfg_t cfg;
/**
* 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.
accel10_cfg_setup( &cfg );
ACCEL10_MAP_MIKROBUS( cfg, MIKROBUS_1 );
accel10_init( &accel10, &cfg );
Delay_ms( 500 );
log_printf( &logger, "---------------------\r\n" );
log_printf( &logger, " Accel 10 Click\r\n" );
log_printf( &logger, "---------------------\r\n" );
// Checking communication
if ( accel10_check_id( &accel10 ) == ACCEL10_SUCCESS )
{
log_printf( &logger, " Communication OK\r\n" );
log_printf( &logger, "---------------------\r\n" );
Delay_ms( 100 );
}
else
{
log_printf( &logger, " Communication ERROR\r\n" );
log_printf( &logger, " Reset the device\r\n" );
log_printf( &logger, "---------------------\r\n" );
for ( ; ; );
}
accel10_default_cfg ( &accel10 );
log_printf( &logger, " Default config.\r\n" );
log_printf( &logger, "---------------------\r\n" );
Delay_ms( 100 );
}
void application_task ( void )
{
if ( accel10_check_data_ready( &accel10 ) == ACCEL10_STATUS_DATA_READY )
{
accel10_get_data ( &accel10, &accel_data );
Delay_ms( 10 );
log_printf( &logger, " Accel X : %d\r\n", accel_data.x );
log_printf( &logger, " Accel Y : %d\r\n", accel_data.y );
log_printf( &logger, " Accel Z : %d\r\n", accel_data.z );
temperature = accel10_read_temperature( &accel10 );
Delay_ms( 10 );
log_printf( &logger, " Temperature : %d C\r\n", ( int16_t ) temperature );
log_printf( &logger, "---------------------\r\n" );
Delay_ms( 1000 );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
