Elevate your vibrational experience with DRV2605 and ATmega328P

The future of vibration control: ERM and LRA in harmony

Published Feb 14, 2024

Click board™

HAPTIC Click

Dev. board

Arduino UNO Rev3

Compiler

NECTO Studio

MCU

ATmega328P

Our solution is engineered to provide precise control over ERM and LRA vibration motors, offering businesses the tools they need to optimize vibrational experiences and meet diverse application needs

Hardware Overview

How does it work?

Haptic Click is based on the DRV2605, a haptic driver for ERM and LRA with a built-in library and Smart-Loop architecture from Texas Instruments. It is designed to provide highly flexible haptic control of ERM and LRA actuators over a shared I2C bus, thus relieving the host MCU from generating PWM drive signals and saving costly timer interrupts and hardware pins. Using the ToushSense® 2200 software eliminates the need to design waveforms, too. It includes an extensive effects library and audio vibe features, with a real-time playback mode that allows the host MCU to bypass the library playback engine and play waveforms directly from the host through I2C. The

Smart Loop architecture allows effortless auto resonant drive for LRA and feedback-optimized ERM drive. The audio-to-haptics mode automatically converts an audio input signal to meaningful haptic effects. Haptic Click communicates with the host MCU using a standard I2C 2-Wire interface over the mikroBUS™ socket. The input audio signal to the DRV2605 comes through a 3.5mm audio jack. The channel side (left or right) can be selected over an R4 and R5 pair of jumpers, with R5 populated by default, thus choosing the right channel. The PWM SEL jumper turns off the PWM trigger when unsoldered, thus avoiding potential interference

with audio output. The LRA/ERM screw terminal is used to connect the haptic motor. In addition, this Click board™ features test points to hook up measuring equipment while developing. These test points are connected to the DRV2605 outputs toward LRA/ERM screw terminals. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

Features overview

Development board

Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an

ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the

first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.

Microcontroller Overview

MCU Card / MCU

Architecture

AVR

MCU Memory (KB)

Silicon Vendor

Microchip

Pin count

RAM (Bytes)

2048

You complete me!

Accessories

Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.

Vibration ERM Motor 9K RPM 3V (VC1026B002F - old MPN C1026B002F) represents a compact-size Eccentric Rotating Mass (ERM) motor designed by Vybronics. This type of motor contains a small eccentric weight on its rotor, so while rotating, it also produces a vibration effect often used for haptic feedback on many small handheld devices. Due to its circular shape with a diameter of 10mm, the VC1026B002F is often referred to as a coin motor. The main characteristics of this vibration motor are its supply voltage, in this case, 3VDC, maximum rated current of 85mA, and the rated speed of 9000RPM, which produces the highest G force/vibration energy of 0.80GRMS. It can also be used with self-adhesive tape to mount it on your PCB or the inner wall of your product's housing.

Used MCU Pins

mikroBUS™ mapper

RST

Enable

PB2

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

PWM Signal

PD6

PWM

INT

I2C Clock

PC5

SCL

I2C Data

PC4

SDA

Power Supply

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

Click Shield for Arduino UNO front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Arduino UNO Rev3 as your development board.

Arduino UNO Rev3 front image hardware assembly

Charger 27 Click front image hardware assembly

Charger 27 Click complete accessories setup image hardware assembly

Board mapper by product8 hardware assembly

Necto No Display image step 8 hardware assembly

Debug Image Necto Step hardware assembly

Software Support

Library Description

This library contains API for HAPTIC Click driver.

Key functions:

haptic_enable - Enable the device function
haptic_disable - Disable the device function
haptic_set_mode - Sets the Haptic click to desired mode function.

Open Source

Code example

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

/*!
 * \file 
 * \brief Haptic Click example
 * 
 * # Description
 * This application generate vibrations from the lower frequency range of the audio input.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Configures the Click board in Audio-to-Vibe mode.
 * 
 * ## Application Task  
 * An infinite loop.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "haptic.h"

// ------------------------------------------------------------------ VARIABLES

static haptic_t haptic;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;
    haptic_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.

    haptic_cfg_setup( &cfg );
    HAPTIC_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    haptic_init( &haptic, &cfg );

    log_printf( &logger, " Configuring the Click board...\r\n" );
    log_printf( &logger, "----------------------- \r\n" );
    
    haptic_enable( &haptic );
    haptic_set_mode( &haptic, HAPTIC_MODE_AUTOCAL );
    haptic_start_motor( &haptic );
    Delay_ms ( 500 );

    haptic_set_mode( &haptic, HAPTIC_MODE_AUDIOVIBE );
    haptic_enable_ac_coulping( &haptic );
    haptic_set_input_to_analog( &haptic );
    
    log_printf( &logger, " The Click board is configured in Audio-to-Vibe mode...\r\n" );
}

void application_task ( void )
{
    // Nothing to do here...
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}
// ------------------------------------------------------------------------ END