SparkFun
Force Sensitive Resistor - Small
A compact force sensitive resistor (FSR) from Interlink Electronics with a 4 mm (0.16″) diameter active sensing area. The resistance changes based on applied...
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A compact force sensitive resistor (FSR) from Interlink Electronics with a 4 mm (0.16″) diameter active sensing area. The resistance changes based on applied pressure — from over 1 MΩ with no pressure down to approximately 2.5 kΩ at full force — making it easy to detect touch, squeeze, and weight in your projects.
The two pins have standard 0.1″ pitch spacing, so the sensor plugs directly into a breadboard for quick prototyping. While not precise enough for accurate weight measurement, FSRs are excellent for detecting the presence and relative intensity of pressure.
Key Features
- 4 mm Active Area – Compact circular sensing surface
- Variable Resistance – >1 MΩ (no pressure) to ~2.5 kΩ (full pressure)
- Breadboard Friendly – 0.1″ pitch pins for easy prototyping
- Simple Interface – Works as a variable resistor in a voltage divider circuit
Specifications
- Sensing Area – 4 mm (0.16″) diameter
- Resistance Range – >1 MΩ (no force) to ~2.5 kΩ (full force)
- Pin Pitch – 0.1″ (2.54 mm)
- Manufacturer – Interlink Electronics
Ideal For
- Touch and squeeze detection in interactive projects
- Pressure-sensitive triggers and inputs
- Wearable electronics and soft robotics
- Arduino and microcontroller sensor projects
Jargon buster
Plain-language definitions for the technical terms used above.
- FSR
- FSR usually means full-scale range, the total span between the lowest and highest value a converter can output or measure, so error figures quoted as a percentage of FSR depend on the selected range such as 2.5 V or 5 V. In other contexts FSR can instead mean a force-sensing resistor, a component whose resistance changes with applied pressure, so check which sense is meant.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
Find this product in
Brands
Sensors & Input
FSR400 Datasheet
Datasheet · 695.5 KB · Click any page to view full size
FSR Integration Guide
User Guide · 963.8 KB · Click any page to view full size
Force Sensing Resistor Integration Guide
User Guide · 963.8 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 445.2 KB · Click any page to view full size
Related Tutorials
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