LRA/ERM haptic driver with multiple input triggers, integrated waveform memory and wideband support
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Hardware Overview
How does it work?
Haptic 4 Click is based on the DA7280, a haptic driver designed to drive linear resonant actuator (LRA) and eccentric rotating mass (ERM) actuators from Renesas. The DA7280 stands out with its automatic closed-loop LRA resonant frequency tracking feature, ensuring consistent performance across various conditions, including production tolerances and mechanical coupling effects. Depending on the register configuration, its capability to drive both LRA and ERM actuators originates from its differential output drive architecture and continuous motion sensing, which foster calibration-free operation and reduce software complexity. The DA7280's architecture is optimized for wideband operation, unlocking the full potential of the latest wideband and multidirectional LRAs. This feature makes it ideal for many applications, from wearables and electronic
peripherals to automotive, industrial settings, and AR/VR controllers. The DA7280's unique ability to control the drive level across loads connected to the OUT terminal and to sense actuator movement via a current-regulated loop and high-frequency PWM modulation enhances its utility. With support for six independent haptic sequences triggered via the mikroBUS™ pins (GP0, GP1, and GP2) without host interaction and options for external control via I2C or PWM signal, the DA7280 ensures versatile haptic feedback configurations. Using the I2C interface, this Click board™ can communicate with the host MCU supporting frequency up to 1MHz. The DA7280 is also capable of closed-loop actuator monitoring while driving to enable calibration-free playback, frequency tracking (LRA only), Active Acceleration, Rapid Stop, and actuator diagnostics available on the IRQ pin of the mikroBUS™ socket.
Continuous resonant frequency tracking can be enabled while driving an LRA to track the mechanical resonance of the actuator through closed-loop control. This feature maximizes electrical to mechanical energy conversion efficiency for narrowband actuators and is especially useful in applications such as operating system notifications and alarms. 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
Clicker 4 for STM32F4 is a compact development board designed as a complete solution that you can use to quickly build your own gadgets with unique functionalities. Featuring an STM32F407VGT6 MCU, four mikroBUS™ sockets for Click boards™ connectivity, power management, and more, it represents a perfect solution for the rapid development of many different types of applications. At its core is an STM32F407VGT6 MCU, a powerful microcontroller by STMicroelectronics based on the high-performance
Arm® Cortex®-M4 32-bit processor core operating at up to 168 MHz frequency. It provides sufficient processing power for the most demanding tasks, allowing Clicker 4 to adapt to any specific application requirements. Besides two 1x20 pin headers, four improved mikroBUS™ sockets represent the most distinctive connectivity feature, allowing access to a huge base of Click boards™, growing on a daily basis. Each section of Clicker 4 is clearly marked, offering an intuitive and clean interface. This makes working with the
development board much simpler and, thus, faster. The usability of Clicker 4 doesn’t end with its ability to accelerate the prototyping and application development stages: it is designed as a complete solution that can be implemented directly into any project, with no additional hardware modifications required. Four mounting holes [4.2mm/0.165”] at all four corners allow simple installation by using mounting screws.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M4
MCU Memory (KB)
10
Silicon Vendor
STMicroelectronics
Pin count
100
RAM (Bytes)
100
You complete me!
Accessories
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
Take a closer look
Schematic
Step by step
Project 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.
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 Haptic 4 Click driver.
Key functions:
haptic4_check_communication
- This function checks the communication by reading and verifying the chip IDhaptic4_set_vibration_level
- This function sets the motor vibration levelhaptic4_get_vibration_level
- This function reads the motor vibration level
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 Haptic 4 Click example
*
* # Description
* This example demonstrates the use of Haptic 4 click board by controlling
* the attached motor vibration level.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration.
*
* ## Application Task
* Changes the motor vibration level every 2 seconds between MAX and MIN,
* and displays the currently set level on the USB UART.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "haptic4.h"
static haptic4_t haptic4;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
haptic4_cfg_t haptic4_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.
haptic4_cfg_setup( &haptic4_cfg );
HAPTIC4_MAP_MIKROBUS( haptic4_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == haptic4_init( &haptic4, &haptic4_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( HAPTIC4_ERROR == haptic4_default_cfg ( &haptic4 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
float vibration_level;
if ( HAPTIC4_OK == haptic4_set_vibration_level ( &haptic4, HAPTIC4_VIBRATION_LEVEL_MAX ) )
{
if ( HAPTIC4_OK == haptic4_get_vibration_level ( &haptic4, &vibration_level ) )
{
log_printf( &logger, " Vibration level: %.3f \r\n\n", vibration_level );
}
}
Delay_ms ( 2000 );
if ( HAPTIC4_OK == haptic4_set_vibration_level ( &haptic4, HAPTIC4_VIBRATION_LEVEL_MIN ) )
{
if ( HAPTIC4_OK == haptic4_get_vibration_level ( &haptic4, &vibration_level ) )
{
log_printf( &logger, " Vibration level: %.3f \r\n\n", vibration_level );
}
}
Delay_ms ( 2000 );
}
int main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END