FSR-402 Force Sensitive Resistor

Product Description

The FSR-402 Force Sensitive Resistor is a thin, flexible, round pressure sensor that detects changes in applied force by varying its electrical resistance. As pressure increases on the sensing surface, the sensor’s resistance decreases, providing a simple way to detect touch, pressure, and grip force.

With a 0.5-inch (14.7mm) circular sensing area and an approximate force range of 100g to 10kg, the FSR-402 is suitable for robotics, wearable electronics, human-machine interfaces, pressure-sensitive controls, and experimental sensing applications.

The sensor features a simple 2-wire connection with approximately 2.54mm pin spacing, making it convenient to connect to Arduino, ESP32, and other microcontrollers using a basic voltage-divider circuit.

Pressure-Sensitive Operation

The FSR-402 has a very high resistance when little or no force is applied. As pressure is applied to the sensing area, its resistance gradually decreases.

This changing resistance can be converted into a measurable voltage using a resistor divider, allowing a microcontroller to detect different levels of applied pressure.

Thin & Flexible Design

Its ultra-thin and lightweight construction makes the FSR-402 easy to integrate into compact mechanisms, wearable devices, robotic grippers, and custom pressure-sensitive surfaces.

Key Features

• Force Sensitive Resistor (FSR)
• Circular 0.5-inch sensing area
• Approx. 14.7mm sensing diameter
• Approx. 100g–10kg force range
• Resistance decreases with applied pressure
• Thin and lightweight construction
• Simple 2-wire interface
• Approx. 2.54mm pin spacing
• Easy to interface with Arduino and ESP32
• Suitable for touch and grip detection

Technical Specifications

Working Principle

The FSR-402 operates by changing its electrical resistance in response to applied mechanical force. When force is low, the resistance is high. As force increases, the resistance decreases.

The resistance change can be measured using a voltage-divider circuit connected to an analog input of a microcontroller. The resulting voltage can then be used to detect touch, pressure, or relative force changes.

Typical Application Scenarios

Robotics

Useful for grip detection, robotic fingers, tactile sensing, and contact detection.

Wearable Electronics

Its thin construction makes it suitable for experimental wearable pressure and touch sensing applications.

Human-Machine Interfaces

Can be used for pressure-sensitive buttons, controls, and interactive surfaces.

Research & Prototyping

Suitable for laboratory experiments and custom pressure-sensing prototypes.

Applications

• Robotic grippers
• Tactile sensing
• Grip detection
• Pressure-sensitive buttons
• Wearable electronics
• Human-machine interfaces
• Touch detection
• Smart surfaces
• Research projects
• Arduino projects
• ESP32 projects
• DIY electronics

Interface

The FSR-402 uses a simple 2-wire connection. It can be connected to a microcontroller through a basic voltage-divider circuit and read using an analog input.

Package Includes

• 1 × FSR-402 Round Force Sensitive Resistor (0.5 inch)

Important Note

The FSR-402 is intended primarily for touch, pressure, and relative force detection. It should not be treated as a precision weighing sensor or used where highly accurate force measurement is required.

Proper mechanical mounting and consistent application of force are important for repeatable readings.

Product Disclaimer

Product specifications may vary slightly between manufacturers and production batches. Product images are for illustrative purposes only and may differ from the actual product in appearance, dimensions, or construction.