Gravity: Haptic Motor Driver for LRA Motors

Gravity: Haptic Motor Driver is a compact controller module designed for Linear Resonant Actuators (LRAs), enabling high‑fidelity tactile feedback in embedded electronics and interactive systems. Powered by the TM6605 haptic driver chip, this tactile control board converts simple I2C commands into rich vibration effects suitable for robotics, gaming interfaces, and smart user interfaces. Operating from 3.7V–5.2V and supporting LRA frequencies between 140–220Hz, the haptic feedback module combines automatic resonance tracking, a large built‑in vibration library, and a plug‑and‑play Gravity interface for seamless integration with controllers such as Arduino and Raspberry Pi.

Figure: Wiring Diagram of Gravity: Haptic Motor Driver and Arduino

Rich Haptic Library with 44 Built-in Modes

An integrated library of 44 pre‑programmed vibration patterns enables rapid implementation of diverse tactile sensations. Effects range from subtle button‑click feedback to strong rumble responses, all triggered through straightforward I2C commands. This vibration control module eliminates complex waveform generation normally required for LRA motors, allowing rapid development of responsive tactile interfaces across robotics controllers, handheld devices, and experimental interactive hardware.

Figure: Vibration mode of Gravity: Haptic Motor Driver

Automatic Resonance Tracking

Linear Resonant Actuators operate most efficiently at a narrow resonant frequency range. This Gravity‑series haptic driver board features automatic resonance tracking that detects and locks onto the actuator’s optimal operating frequency. Continuous calibration ensures maximum vibration strength, sharp tactile feedback, and consistent performance without manual tuning, making the LRA control module well suited for rapid prototyping and production‑ready interaction systems.

Plug‑and‑Play Gravity I2C Integration

A standard Gravity I2C connector enables fast electrical integration with common development platforms and embedded controllers. The tactile feedback kit includes a compatible LRA motor and Gravity 4‑pin sensor cable, forming a complete haptic feedback solution ready for immediate experimentation. Such plug‑and‑play hardware design simplifies wiring and accelerates development of interactive robotics, smart interfaces, and experimental control panels.

This LRA haptic driver module suits applications requiring compact, responsive tactile feedback. Robotics control panels, immersive gaming hardware, wearable alert devices, and experimental human‑machine interfaces benefit from programmable vibration cues. Rapid I2C control combined with built‑in vibration patterns enables developers and educators in STEM Education environments to quickly prototype sophisticated haptic interaction systems.