4.5" Flex Sensor – Bend Sensor for Arduino & ESP32

The 4.5-inch Flex Sensor is a precision resistive bend sensor that changes its resistance when flexed. It is widely used in robotics, wearable electronics, gesture recognition, prosthetics, and motion sensing applications. As the sensor bends, its resistance increases, allowing microcontrollers such as Arduino, ESP32, Raspberry Pi, and STM32 to accurately measure the amount of flex using a simple voltage divider circuit.

Its slim, lightweight construction makes it easy to integrate into gloves, robotic joints, mechanical linkages, and interactive projects. With a life expectancy of over one million flex cycles, it provides reliable long-term performance for both educational and professional applications.

Key Features
4.5-inch flexible bend sensor
High-precision resistive output
Simple analog interface
Compatible with Arduino, ESP32, Raspberry Pi, STM32 and other microcontrollers
Lightweight and low-profile design
Long service life (>1 million flex cycles)
Ideal for gesture and motion sensing
Easy to integrate using a voltage divider

Specifications
Sensor Type: Resistive Flex Sensor
Length: 4.5 inches (≈114 mm overall)
Active Sensing Length: Approximately 95 mm
Flat Resistance: 10 kΩ (±30%)
Bend Resistance: Typically 60–110 kΩ depending on bend radius
Power Rating: 0.5 W continuous (1 W peak)
Operating Temperature: -35°C to +80°C
Life Cycle: Over 1 million flexes
Output Type: Variable resistance (analog)
Thickness: Approximately 0.43 mm

Applications
Robotic fingers and grippers
Wearable electronics
Motion capture systems
Gesture-controlled devices
Prosthetics
Physical therapy equipment
Gaming controllers
Musical instruments
STEM education
Human-machine interfaces

Package Includes
1 × 4.5" Flex Sensor