DFRobot Gravity 4×8 Flexible Array Tactile Pressure Sensor (UART Cascade Support)
SKU: SENS-1985
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DFRobot Gravity 4×8 Flexible Array Tactile Pressure Sensor (UART Cascade Support)

₹2,939.00 (Inclusive of all taxes)
Out of Stock

The DFRobot Gravity 4×8 Flexible Array Tactile Pressure Sensor is a 32-point Matrix sensor for precise pressure mapping and tactile feedback. It features a UART interface with cascade support for easy daisy-chaining and is compatible with Arduino, ESP32, and Raspberry Pi for robotics, wearables, and human-machine interface projects.

Features

  • 4×8 Matrix with 32 independent sensing points for detailed pressure distribution mapping.
  • Ultra-thin, flexible FPC construction with adhesive backing for mounting on flat or curved surfaces.
  • UART communication interface with built-in cascade support for connecting multiple sensors in series.
  • High durability rated for over 1,000,000 operating cycles at 1kg force for long-term reliability.
  • Fast response time below 10μs and configurable 20Hz/50Hz sampling frequency for dynamic sensing applications.

Out of stock

Description

This sensor utilizes a grid of 32 individual force-sensitive elements arranged in a 4×8 Matrix across a compact 20mm x 10mm active area, with a 2.5mm pitch between points. Each point operates on a compression-based sensing principle, providing independent readings within a range of 20g to 5kg per point, with a trigger force as low as 20g. The flexible printed circuit (FPC) design ensures minimal added bulk and conforms to various surfaces.

The integrated UART interface simplifies digital communication, eliminating the need for complex analog signal conditioning. The cascade functionality allows multiple sensor arrays to be linked via a single serial bus, significantly reducing wiring complexity in multi-sensor systems. It is engineered for stable operation across an industrial temperature range of -20°C to +65°C, making it suitable for both controlled lab environments and demanding applications.

Key Features

  • High-Density Tactile Matrix: 32 discrete sensing points provide granular force distribution data for accurate pressure mapping.
  • Flexible & Conformable Design: Thin FPC substrate with adhesive backing allows for easy integration onto irregular or moving surfaces without compromising sensitivity.
  • Digital UART Interface: Offers noise-resistant digital communication and simplifies integration with microcontrollers, supporting configurable baud rates.
  • Multi-Sensor Cascade Support: Built-in serial addressing enables daisy-chaining of multiple sensor arrays, optimizing system wiring and I/O usage.
  • Robust Mechanical Endurance: Validated for over one million actuation cycles under a 1kg load, ensuring longevity in repetitive applications.
  • Rapid Dynamic Response: Sub-10μs response time coupled with selectable sampling rates enables capture of fast-changing pressure events.
  • Broad Microcontroller Compatibility: Works seamlessly with 5V logic platforms like Arduino, as well as 3.3V systems like ESP32 and Raspberry Pi.

Applications

  • Robotic Gripper Force Feedback: Provides detailed pressure profiles for adaptive grasping and object slip detection in robotic end-effectors.
  • Wearable Biomechanical Analysis: Integrated into smart garments or insoles for gait analysis, posture monitoring, and rehabilitation device feedback.
  • Human-Machine Interface (HMI) Panels: Enables touch-sensitive, pressure-aware control surfaces for industrial equipment or interactive installations.
  • Electronic Skin for Prosthetics: Serves as a sensing layer in prosthetic limbs to restore tactile sensation and improve object manipulation.
  • Product Testing & Ergonomics: Maps pressure distribution during mechanical testing, button actuation validation, or ergonomic handle design.

Technical Specifications

Operating Voltage5V DC
Array Configuration4 × 8 (32 Points)
Sensing Area20 × 10 mm
Point Pitch2.5 mm
Communication InterfaceUART (Cascade Support)
Trigger Force20 g
Pressure Range (per point)20 g ~ 5 kg
Pressure TypeCompression
Sampling Frequency20 Hz / 50 Hz (Selectable)
Response Time< 10 μs
Durability> 1,000,000 cycles (at 1kg force)
Operating Temperature-20℃ ~ +65℃
Adapter Board Size20 × 12 mm
Weight (Sensor)4 g

Frequently Asked Questions

What is the operating voltage and how do I power this sensor?

The sensor operates at a strict 5V DC supply provided through its adapter board. Ensure your microcontroller (like an Arduino Uno) or a regulated 5V power source is connected to the board's VCC and GND pins. The UART logic levels are also 5V, so when connecting to a 3.3V device like an ESP32, a logic level converter may be required for the TX/RX lines.

How does the UART cascade support work for connecting multiple sensors?

The sensor features a dedicated cascade mode and address configuration via its onboard microcontroller. Multiple sensors can be connected in a daisy-chain fashion using the provided cable, with each assigned a unique address. This allows all sensors to communicate over a single UART port (TX/RX) on your host controller, drastically simplifying wiring in systems requiring large-area or multi-point pressure sensing.

What is the pressure range and resolution for each sensing point?

Each of the 32 sensing points has an individual measurement range from 20g (trigger force) up to 5kg. The output is a digital value transmitted via UART. The resolution is dependent on the internal ADC and firmware, providing granular enough data to discern subtle force variations across the Matrix, suitable for detailed pressure distribution mapping.

Can this flexible sensor be mounted on curved surfaces?

Yes, the ultra-thin Flexible Printed Circuit (FPC) construction is designed to conform to curved or irregular surfaces. The adhesive backing allows for secure mounting. Care should be taken during installation to avoid Sharp Microelectronics bends or creases directly over the active sensing area to prevent damage to the delicate traces and sensing elements.

Is this sensor compatible with Raspberry Pi and ESP32?

Yes, it is compatible with both Raspberry Pi and ESP32, as well as Arduino. The primary interface is digital UART. For the 5V UART logic of the sensor to safely connect to the 3.3V GPIO of Raspberry Pi or ESP32, you must use a bi-directional logic level converter on the TX and RX lines to prevent damage to the microcontroller.

Package Includes

  • 1 x DFRobot Gravity 4×8 Flexible Array Tactile Pressure Sensor (Main Module)
  • 1 x 4×8 Flexible Array Pressure Sensor (FPC Array)
  • 1 x 30cm Flexible Silicone Connection Cable

Additional Information

Weight 0.01 kg
Dimensions 6 × 6 × 3 cm

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