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

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

The Square Force Sensing Resistor (44mm × 44mm) is a thin, flexible, pressure-sensitive sensor designed to detect force and applied pressure. Its electrical resistance changes according to the amount of force applied to the sensing area. As the applied force increases, the resistance decreases, making it suitable for touch detection, pressure sensing, grip detection, and interactive control applications.

With a detectable force range of approximately 100 grams to 10 kilograms, this sensor provides a simple and convenient solution for detecting physical pressure in robotics, automation, DIY electronics, and human-machine interface projects.

The sensor features a 44mm × 44mm square sensing area and a simple 2-wire interface. Its 2.54mm (0.1″) pin spacing makes it convenient to connect to breadboards, PCBs, Arduino boards, and other microcontroller-based systems.

The rear side includes a peel-and-stick adhesive backing, allowing the sensor to be easily mounted onto suitable flat surfaces. Its thin and flexible construction makes it suitable for applications where a compact and unobtrusive pressure sensor is required.

This force sensing resistor is intended primarily for force and pressure detection rather than precision weighing. It can be integrated into custom electronic circuits to monitor changes in applied force and trigger actions based on pressure levels.

Features

• Square force sensing resistor
• Sensing area: 44mm × 44mm
• Detectable force range: approximately 100g to 10kg
• Resistance decreases as applied force increases
• Thin and flexible construction
• Simple 2-wire interface
• 2.54mm (0.1″) pin spacing
• Breadboard and PCB friendly
• Peel-and-stick adhesive backing
• Easy to mount on suitable flat surfaces
• Suitable for touch and pressure detection
• Useful for grip force detection
• Compact design for embedded applications
• Simple interface with Arduino and other microcontrollers
• Suitable for robotics and automation projects
• Ideal for DIY electronics and research projects
• Not intended for high-accuracy weighing applications

Specifications

Parameter	Specification
Product Type	Square Force Sensing Resistor
Sensor Type	Force Sensitive Resistor (FSR)
Sensing Area	44mm × 44mm
Detectable Force Range	Approximately 100g to 10kg
Output Characteristic	Resistance changes with applied force
Resistance Response	Resistance decreases as force increases
Number of Pins	2
Pin Spacing	2.54mm (0.1″)
Construction	Thin and Flexible
Mounting	Peel-and-Stick Adhesive Backing
Connection Type	2-Wire
Application	Force, Pressure and Touch Detection

Design and Construction

The Square Force Sensing Resistor features a compact 44mm × 44mm square sensing surface designed to detect pressure applied across its active area. Its thin and flexible construction allows it to be integrated into a variety of mechanical and electronic assemblies.

The sensor uses a force-sensitive resistive element whose electrical resistance changes according to the force applied to the sensing surface. This makes it possible to monitor relative changes in pressure using a suitable electronic circuit or microcontroller.

The sensor includes two electrical terminals with 2.54mm (0.1″) spacing, allowing straightforward connection to breadboards, PCBs, jumper wires, and microcontroller-based circuits.

A peel-and-stick adhesive layer is provided on the back of the sensor for convenient installation. This allows the FSR to be attached to suitable flat surfaces in robotics, control panels, interactive devices, and experimental setups.

Its lightweight and flexible construction makes it useful for applications where traditional rigid force sensors may not be suitable.

Working Principle

The Square Force Sensing Resistor operates by changing its electrical resistance when mechanical force is applied to its sensing surface.

When there is little or no pressure on the sensor, its resistance is typically very high, generally greater than 1MΩ. As force is applied to the sensing area, the resistance decreases.

The change in resistance can be measured using an electronic circuit, commonly with a voltage-divider arrangement connected to an analog input of a microcontroller such as an Arduino.

As the applied pressure increases, the measured electrical signal changes accordingly. The microcontroller can then use this signal to detect touch, estimate relative force levels, activate an output, or control another device.

The sensor is therefore a passive sensing component and does not independently generate a digital signal or require complex communication protocols.

Applications

• Robotics and automation
• Pressure-sensitive switches
• Touch detection systems
• Human-machine interfaces
• Grip force detection
• Robotic grippers
• Interactive control systems
• Smart surfaces
• Pressure monitoring
• DIY electronics projects
• Arduino projects
• Microcontroller-based projects
• Embedded sensing systems
• Educational electronics
• Research and prototyping
• Interactive installations
• Custom control interfaces
• Force-responsive mechanisms
• Automation prototypes
• Experimental pressure sensing

Package Includes

• 1 × Square Force Sensing Resistor (44mm × 44mm, 100g–10kg)

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual product may vary slightly in appearance, dimensions, markings, or construction depending on the manufacturing batch.

The stated force range is approximate and the sensor is intended primarily for relative force and pressure detection rather than precision measurement or calibrated weighing applications.

Actual resistance characteristics may vary depending on applied force, contact area, sensor placement, environmental conditions, and usage.

Suitable electronic circuitry, wiring, and a microcontroller or measurement device are required to read the sensor output. These components are not included unless specifically mentioned in the package contents.

Recommended Related Products

Explore relevant force-sensing and pressure-sensing products from the TechyTron catalogue.

• FSR-402 Force Sensitive Resistor – 14.7mm Round Pressure Sensor (100g–10kg)
• Force and Pressure Sensors – TechyTron Category