Force Sensing Resistor – Square 44mm (FSR-406 Type)

Square Force Sensing Resistor 44mm × 44mm – 100g to 10kg Pressure Sensor

The 44mm × 44mm Square Force Sensing Resistor (FSR) is a thin, flexible pressure sensor designed to detect applied force and pressure. Its electrical resistance changes in response to the force applied to its sensing surface, making it ideal for pressure detection, touch-sensitive controls, grip sensing and robotics applications.

With an approximate force detection range of 100g to 10kg, this compact Force Sensitive Resistor provides a simple way to monitor relative pressure changes in electronic systems. It can be easily integrated with Arduino, ESP32 and other microcontroller platforms using a basic voltage divider circuit.

Featuring a 44mm × 44mm active sensing area, a simple 2-wire connection and 2.54mm (0.1-inch) terminal spacing, this sensor is convenient for prototyping and electronic circuit integration. Its flexible construction and rear peel-and-stick adhesive backing allow easy mounting on suitable flat surfaces.

Whether you are developing a robotic gripper, pressure-sensitive interface, interactive electronic device or DIY automation project, this square FSR sensor offers a compact and practical force detection solution.

Key Features

• 44mm × 44mm Square Sensing Area: Provides a large active surface for detecting applied pressure.
• 100g to 10kg Force Detection Range: Suitable for a variety of light-touch and pressure-sensing applications.
• Variable Resistance Output: Electrical resistance decreases as the applied force increases.
• Flexible and Thin Design: Easily integrates into compact electronic and mechanical assemblies.
• Simple 2-Wire Interface: Easy to connect with electronic circuits and microcontrollers.
• 2.54mm Terminal Spacing: Convenient for breadboards, jumper wires and PCB integration.
• Self-Adhesive Backing: Peel-and-stick adhesive for convenient surface mounting.
• Microcontroller Compatible: Can be interfaced with Arduino, ESP32 and other analog-input platforms.
• Wide Application Range: Suitable for robotics, automation, touch detection and interactive electronics.

Technical Specifications

How Does the Force Sensitive Resistor Work?

The Square Force Sensing Resistor works by changing its electrical resistance when pressure is applied to its active sensing area.

• No Pressure: The sensor exhibits very high resistance, typically greater than 1MΩ.
• Light Pressure: Resistance decreases as force is applied.
• Increasing Pressure: Resistance generally decreases further with increasing applied force.

The resistance variation can be measured using a voltage divider circuit connected to an analog input of an Arduino, ESP32 or another microcontroller.

The controller can process the changing analog signal to detect touch, identify relative pressure levels, monitor grip force or activate an output based on predefined thresholds.

Note: An FSR is primarily designed for relative force detection. It is not a calibrated load cell and should not be used where precise weight measurement is required.

Applications of 44mm × 44mm FSR Sensor

This square force sensing resistor can be used in a wide range of electronic and embedded applications:

• Robotics: Detect contact and pressure in robotic systems.
• Robotic Grippers: Monitor gripping force applied to objects.
• Arduino Projects: Build pressure-sensitive electronic projects.
• ESP32 Projects: Integrate force sensing into IoT and embedded systems.
• Touch-Sensitive Controls: Develop pressure-activated switches and interfaces.
• Human-Machine Interfaces: Create interactive pressure-responsive controls.
• Industrial Automation: Detect applied force in custom automation systems.
• Smart Surfaces: Develop interactive and pressure-sensitive surfaces.
• DIY Electronics: Experiment with force and pressure detection.
• Research and Education: Use in prototyping, experiments and electronic learning projects.