FST 5.08mm Circle Force Sensor (Original)
What Is It?
A circular Force-Sensitive Resistor (FSR) designed to detect applied force or pressure.
Very small sensing area (5.08 mm diameter) ideal for precise, localized force detection.
Common in touch, medical, and compact embedded systems.
Key Features
Ultra-Compact Size: Small circular sensing area (5.08 mm)
Analog Output: Resistance changes with applied force
Flexible & Thin Design: Easy to integrate into tight spaces
Fast Response: Suitable for real-time sensing
High Durability: Supports >1 million actuation cycles
Repeatability: Around 10%
g/p
Parameter | Value |
Active Area | 5.08 mm diameter |
Overall Size | ~7.62 mm diameter |
Thickness | ~0.5 mm |
Force Range | ~0.1 N to 10 N |
Actuation Force | ~0.1 N |
Resistance (No Force) | >10 M |
Resistance (With Force) | ~1 k few k |
Response Time | <10 ms |
Operating Temp. | 30C to +70C |
Actuation Life | >1 million cycles |
How It Works
The sensor uses a pressure-sensitive conductive material.
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This change is converted into voltage using a voltage divider circuit.
A microcontroller reads the voltage via an analog input (ADC).
Basic Connection
One terminal VCC (through resistor)
Other terminal Analog pin + GND
Typical:
Use a 10 k resistor to form a voltage divider.
Working Behavior
No Force High Resistance Low Voltage
More Force Lower Resistance Higher Voltage
Output is non-linear, so calibration is needed for accurate force values.
Applications
Touch sensing (buttons, interfaces)
Medontrols & joysticks
Robotics (grip/force feedback)
Wearables & smart textiles
Micro-scale pressure detection systems
Important Notes
Not for precise weight measurement (use load cell instead)
Small sensing area requires accurate force placement
Non-linear output calibration required
Wear over time under repeated heavy pressure
Summary
Type: Circular Force-Sensitive Resistor (FSR)
Size: 5.08 mm sensing area
Output: Analog (resistance-based)
Best Use: Small-area forc
