Beginner
10 min

Achieve precise detection of movements, crucial for motion-based applications, with ICM-42670-P and PIC18F47K42TQFP

Motion tracking and orientation detection based on a 6-axis MEMS MotionTracking IMU

6DOF IMU 22 Click with Curiosity Nano with PIC18F47K42

Published Mar 15, 2024

Click board™

6DOF IMU 22 Click

Dev.Board

Curiosity Nano with PIC18F47K42

Compiler

NECTO Studio

MCU

PIC18F47K42TQFP

Accurately track and measure movements and orientations of an object by detecting how fast and in which direction it's moving or tilting

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Hardware Overview

How does it work?

6DOF IMU 22 Click is based on the ICM-42670-P, a state-of-the-art 6-axis MEMS MotionTracking IMU from TDK InvenSense. This central component incorporates both a 3-axis gyroscope and a 3-axis accelerometer, making it an exceptional tool for precise motion tracking. It has a versatile host interface compatible with I2C and SPI serial communication protocols, a sizeable 2.25Kbytes FIFO, and two customizable interrupts supporting a wake-on-motion feature to reduce power consumption significantly. The gyroscope and accelerometer offer a range of programmable full-scale range settings, ensuring flexibility across various applications. The gyroscope supports four programmable full-scale range settings from ±250dps to ±2000dps, and the accelerometer supports four programmable full-scale range

settings from ±2g to ±16g. The ICM-42670-P stands out in its class for having the lowest noise levels and unparalleled stability under temperature fluctuations, physical shocks, or offsets caused by soldering or bending. It also offers protection against noise from vibrations outside its frequency band. Adding to its impressive feature set are an on-board APEX Motion Processing engine for advanced gesture and step recognition, programmable digital filters, and an integrated temperature sensor, making it ideally suited for creating wearables, smart home devices, robotics, and immersive AR/VR experiences. 6DOF IMU 22 Click supports both I2C and SPI interfaces, enabling communication at speeds up to 1MHz and 24MHz, respectively. Users can select the desired communication protocol by placing SMD jumpers

on the COMM SEL section, ensuring all jumpers align on the same side to avoid potential issues. For I2C usage, the device allows the adjustment of its I2C slave address's least significant bit via an SMD jumper marked as ADDR SEL. Additionally, the board features a data frame sync input pin routed to the FSY pin on the mikroBUS™ socket and two interrupt pins linked to the INT and IT2 pins, enabling the host MCU to detect user-specified events through the I2C/SPI interface. 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.

6DOF IMU 22 Click hardware overview image

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.

PIC18F47K42 Curiosity Nano double side image

Microcontroller Overview

MCU Card / MCU

default

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.

Curiosity Nano Base for Click boards accessories 1 image

Used MCU Pins

mikroBUS™ mapper

Interrupt 2
PA1
AN
ID SEL
PC7
RST
SPI Select / ID COMM
PD6
CS
SPI Clock
PC6
SCK
SPI Data OUT
PC5
MISO
SPI Data IN
PC4
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Data Frame Sync
PA4
PWM
Interrupt 1
PB4
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PB1
SCL
I2C Data
PB2
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Schematic

6DOF IMU 22 Click Schematic schematic

Step by step

Project assembly

Curiosity Nano Base for Click boards front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F47K42 as your development board.

Curiosity Nano Base for Click boards front image hardware assembly
Barometer 13 Click front image hardware assembly
PIC18F47K42 Curiosity Nano front image hardware assembly
Prog-cut hardware assembly
Curiosity Nano with PIC18F47XXX MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
PIC18F57Q43 Curiosity MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

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.

Application Output Step 1

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™.

Application Output Step 3

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.

Application Output Step 4

Software Support

Library Description

This library contains API for 6DOF IMU 22 Click driver.

Key functions:

  • c6dofimu22_read_data - This function reads the accelerometer, gyroscope, and temperature measurement data

  • c6dofimu22_get_int1_pin - This function returns the INT1 pin logic state

  • c6dofimu22_clear_data_ready - This function clears the data ready interrupt by reading the INT_STATUS_DRDY register

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 6DOF IMU 22 Click example
 *
 * # Description
 * This example demonstrates the use of 6DOF IMU 22 click board by reading and displaying 
 * the accelerometer and gyroscope data (X, Y, and Z axis) as well as a temperature measurement
 * in degrees Celsius.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and performs the click default configuration.
 *
 * ## Application Task
 * Waits for a data ready indication and then reads the accelerometer, gyroscope, and temperature
 * measurements. The results are displayed on the USB UART every 80ms as per the accel and gyro
 * output data rate which is set to 12.5 Hz.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "c6dofimu22.h"

static c6dofimu22_t c6dofimu22;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    c6dofimu22_cfg_t c6dofimu22_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.
    c6dofimu22_cfg_setup( &c6dofimu22_cfg );
    C6DOFIMU22_MAP_MIKROBUS( c6dofimu22_cfg, MIKROBUS_1 );
    err_t init_flag = c6dofimu22_init( &c6dofimu22, &c6dofimu22_cfg );
    if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( C6DOFIMU22_ERROR == c6dofimu22_default_cfg ( &c6dofimu22 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void )
{
    static c6dofimu22_data_t meas_data;
    if ( !c6dofimu22_get_int1_pin ( &c6dofimu22 ) )
    {
        c6dofimu22_clear_data_ready ( &c6dofimu22 );
        if ( C6DOFIMU22_OK == c6dofimu22_read_data ( &c6dofimu22, &meas_data ) )
        {
            log_printf ( &logger, " Accel X: %.2f g\r\n", meas_data.accel.x );
            log_printf ( &logger, " Accel Y: %.2f g\r\n", meas_data.accel.y );
            log_printf ( &logger, " Accel Z: %.2f g\r\n", meas_data.accel.z );
            log_printf ( &logger, " Gyro X: %.1f dps\r\n", meas_data.gyro.x );
            log_printf ( &logger, " Gyro Y: %.1f dps\r\n", meas_data.gyro.y );
            log_printf ( &logger, " Gyro Z: %.1f dps\r\n", meas_data.gyro.z );
            log_printf ( &logger, " Temperature: %.2f C\r\n\n", meas_data.temperature );
        }
    }
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END

Additional Support

Resources