Embark on a journey to stability and accuracy with SCR2100-D08, a single-axis gyroscope and PIC18LF47K40

Your path to stability

Published Sep 12, 2023

Click board™

Gyro 8 Click

Dev Board

EasyPIC v8

Compiler

NECTO Studio

MCU

PIC18LF47K40

Navigate with confidence in any environment, thanks to the reliability and precision delivered by our single-axis gyroscope, designed to exceed your expectations

Hardware Overview

How does it work?

Gyro 8 Click is based on Murata's SCR2100-D08, a high-performance single-axis gyroscope. The SCR2100-D08 is based on proven 3D MEMS technology and highly integrated electronics, offering a performance level characteristic for expensive modules. It consists of an angular rate sensing element and an application-specific integrated circuit (ASIC) used to sense and control the element through an SPI serial interface. Characterized by high stability and reliability, it provides a stable output over ±125°/s X-axis angular rate measurement range. An internal angular rate sensing element consists of moving masses exited to in-plane drive motion. Rotation in a sensitive direction causes out-of-plane movement

that can be measured as capacitance change with the signal conditioning ASIC. It should be noted that the SCR2100-D08 sensor is factory-calibrated, so no separate calibration is required in the application. During manufacturing, the parameters are trimmed during production (sensitivities, offsets, and frequency responses) and stored in non-volatile memory. The parameters are read automatically from the internal non-volatile memory during its Start-up sequence. Gyro 8 Click communicates with MCU through a register-selectable standard SPI interface that enables high clock speed up to 8MHz for optimum performance, supporting the most common SPI mode, SPI Mode 0. Besides the

possibility of controlling and reading gyroscope data via the SPI interface, the SCR2100-D08 also has extensive internal fail-safe diagnostics to detect over-range and possible internal failures and general reset function routed on the RST pin of the mikroBUS™ socket. 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

EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.

Communication options such as USB-UART, USB DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC v8 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

PIC

MCU Memory (KB)

128

Silicon Vendor

Microchip

Pin count

RAM (Bytes)

3728

Used MCU Pins

mikroBUS™ mapper

Reset

RE1

RST

SPI Chip Select

RE0

SPI Clock

RC3

SCK

SPI Data OUT

RC4

MISO

SPI Data IN

RC5

MOSI

Power Supply

3.3V

Ground

GND

PWM

INT

SCL

SDA

Ground

GND

Take a closer look

Schematic

Step by step

Project assembly

EasyPIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.

NECTO Output Selection Step Image hardware assembly

In the advanced settings, pay special attention to the Redirect standard output field. By default, it is set to Application output as the method of displaying final results. To show results via a UART terminal, select the “UART” option in that field and click the “SAVE” button. You will be returned to the Compiler field, and now you can move on to the next step by pressing the “NEXT” button.

Buck 22 Click front image hardware assembly

EasyPIC v8 DIP MB 1 - upright/background hardware assembly

NECTO Compiler Selection Step Image hardware assembly

Necto DIP image step 7 hardware assembly

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 Gyro 8 Click driver.

Key functions:

gyro8_read_serial_id - This function reads the serial ID which is laser marked on the sensor lid
gyro8_read_temperature - This function reads the temperature measurement in Celsius
gyro8_read_angular_rate - This function reads the angular rate of X-axis in dps.

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 Gyro 8 Click example
 *
 * # Description
 * This example demonstrates the use of Gyro 8 click board by reading and displaying
 * the temperature and angular rate measurements.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and the click board, and reads the serial ID number which
 * is marked on the sensor lid.
 *
 * ## Application Task
 * Reads the temperature and angular rate measurements every 100ms and displays the results
 * on the USB UART.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "gyro8.h"

static gyro8_t gyro8;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    gyro8_cfg_t gyro8_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.
    gyro8_cfg_setup( &gyro8_cfg );
    GYRO8_MAP_MIKROBUS( gyro8_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == gyro8_init( &gyro8, &gyro8_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( GYRO8_ERROR == gyro8_default_cfg ( &gyro8 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    uint32_t serial_id;
    if ( GYRO8_OK == gyro8_read_serial_id ( &gyro8, &serial_id ) )
    {
        log_printf ( &logger, " Serial ID: %lu\r\n", serial_id );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void )
{
    float temperature, angular_rate;
    if ( GYRO8_OK == gyro8_read_temperature ( &gyro8, &temperature ) )
    {
        log_printf ( &logger, " Temperature: %.2f degC\r\n", temperature );
    }
    if ( GYRO8_OK == gyro8_read_angular_rate ( &gyro8, &angular_rate ) )
    {
        log_printf ( &logger, " Angular rate: %.2f dps\r\n\n", angular_rate );
    }
    Delay_ms ( 100 );
}

void main ( void )
{
    application_init( );

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

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