Flexiforce Pressure Sensor (FSR) – 25lbs (1″ dia)

£27.60 inc VAT

Availability: 1 in stock

Brand: SparkFun
Part Number: SEN-11207
Barcode: 5055421037703
SKU: PPSEN-11207 Categories: , Tags: ,
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Flexiforce Pressure Sensor (FSR) – 25lbs (1″ dia)

This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor’s resistance. Pressing lightly, the resistance changes from infinite to ~300k.

The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor.

Used as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc.

The overall length is 56.9mm (2.24″). The sensor comes with a 2.54mm (0.1″) spaced, reinforced, breadboard friendly connector.

Although this sensor by default ranges from 0 to 25lbs of pressure, this sensor can measure up to 31,138 N (7,000 lb).

The force range can be extended by reducing the drive voltage, VT, or the resistance value of the feedback resistor, RF.

Conversely, the sensitivity can be increased for the measurement of lower forces by increasing VT or RF.

Features of FlexiForce™ Sensors:

  • Thin [.203 mm (0.008 in)] & Flexible
  • ​Lightweight & Low-Power
  • Customizable
  • Accurate
  • Simple to Use
  • Cost-Effective
  • RoHS Compliant


  • Model No.: A401-25
  • Connector: 2-Pin Male Square Pin
  • Substrate Material: Polyester
  • Linearity (Error): < ±3% of full scale
  • Repeatability: < ±2.5%
  • Hysteresis: < 4.5% of full scale
  • Drift: < 5% per logarithmic time scale
  • Response Time: < 5µsec
  • Operating Temperature -40°C – 60°C (-40°F – 140°F)
  • Durability: ≥ 3 million Actuations @ Perpendicular load, room temperature, 22 N (5 lb)
  • Temperature Sensitivity: 0.36%/°C (± 0.2%/°F)


  • Length: 56.9mm (2.24″)
  • Width: 31.8mm (1.25″)
  • Sensing Area: 25.4mm (1″) diameter
  • Thickness: 0.203mm (0.008″)

Flexiforce Pressure Sensor (FSR) - 25lbs (1


Recommended Circuit:

Flexiforce Pressure Sensor (FSR) - 25lbs (1

Voltage vs Force:

FlexiForce A401-25 Voltage vs Force Graph

Wondering what a Force Sensitive resistor is or how to connect it?



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