Haptic 4 Click

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.

Specifications

Pinout diagram

This table shows how the pinout on Haptic 4 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
General-Purpose I/O 1	GP1	1	AN	PWM	16	GP0	General-Purpose I/O 0 / PWM Signal
General-Purpose I/O 2	GP2	2	RST	INT	15	IRQ	Interrupt
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Haptic 4 Click electrical specifications

Software Support

We provide a library for the Haptic 4 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

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 ID.

• haptic4_set_vibration_level This function sets the motor vibration level.

• haptic4_get_vibration_level This function reads the motor vibration level.

Example Description

This example demonstrates the use of Haptic 4 click board by controlling the attached motor vibration level.

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 rnn", 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 rnn", vibration_level ); 
         } 
     } 
     Delay_ms ( 2000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Haptic4

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK - MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.