Force Sensitive Resistor RP-S40-LT (10g-20kg)
Force Sensitive Resistor RP-S40-LT (10g-20kg) - Image 2
SKU: SENS-0696
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Force Sensitive Resistor RP-S40-LT (10g-20kg)

₹429.00 (Inclusive of all taxes)
Out of Stock

The RP-S40-LT is a thin-film force-sensitive resistor (FSR) providing variable resistance from 500KΩ to 500Ω across a 10g to 20kg sensing range. Its ultra-thin 0.45mm profile and wide operating temperature make it ideal for integration into embedded systems, robotics, and pressure-sensing applications.

Features

  • Ultra-thin 0.45mm polymer thick film (PTF) construction for flexible integration.
  • Wide dynamic sensing range from 10 grams to 20 kilograms.
  • Outputs a variable resistance signal from approximately 500KΩ (light touch) to 500Ω (full force).
  • Robust operating temperature range from -40°C to +85°C.
  • Simple two-terminal resistive interface compatible with voltage divider circuits for microcontrollers.

Out of stock

Description

The RP-S40-LT Force Sensitive Resistor operates on the principle of piezoresistivity, where the electrical resistance through a conductive polymer composite decreases predictably with an increase in applied force. This analog output provides a continuous measurement of pressure across its active sensing area.

Engineered for durability, the sensor’s thin-film structure withstands a wide thermal range from -40°C to +85°C, making it suitable for challenging environments. Its response characteristic is non-linear, typically requiring calibration via a lookup table or polynomial fitting for precise force quantification in end applications.

Key Features

  • High-resolution force detection across a broad 10g to 20kg range.
  • Extremely low-profile 0.45mm thickness enables embedding in tight spaces.
  • Robust polymer-based sensing element resistant to mechanical wear.
  • Wide operating temperature tolerance for industrial and automotive use cases.
  • Simple two-wire resistive output for easy interface with Arduino, Raspberry Pi, and PLC analog inputs.
  • Actuation force threshold as low as 10g for detecting very light touches.
  • High-value build optimized for reliable performance in cost-sensitive designs.

Applications

  • Robotic gripper and end-effector tactile feedback systems.
  • Medical devices for patient interface pressure monitoring.
  • Industrial process control for lightweight part presence detection.
  • Consumer electronics for interactive touch-sensitive controls.
  • Biometric and wearable device integration for activity sensing.

Technical Specifications

ModelRP-S40-LT
Sensing PrinciplePiezoresistive (Force Sensitive Resistor)
Force Sensitivity Range10g to 20kg
Output Resistance Range~500KΩ (min force) to ~500Ω (max force)
Actuation Force (Threshold)10g (Resistance ≤ 200KΩ)
Thickness0.45 mm
Operating Temperature-40°C to +85°C
Interface2-terminal resistive output

Frequently Asked Questions

How do I interface the RP-S40-LT FSR with a microcontroller like Arduino?

Connect the FSR in a simple voltage divider circuit with a fixed pull-down resistor (typically 10kΩ). Connect the junction between the FSR and the fixed resistor to an analog input pin on the Arduino. The voltage read will vary with applied force. Calibration is required to map voltage readings to specific force values due to the sensor's non-linear response.

What is the actuation force, and how is it defined?

The actuation force is the minimum force required to produce a measurable change in resistance. For the RP-S40-LT, a force of 10 grams will cause the resistance to drop to 200KΩ or lower, marking the start of its usable sensing range. This makes it sensitive enough for detecting very light touches or pressures.

Can this sensor be used for precise weight measurement?

While it provides a variable resistance correlated to force, it is best suited for relative pressure sensing, touch detection, or threshold activation rather than high-precision weight measurement. For accurate weighing, a dedicated load cell with a strain gauge and instrumentation amplifier is recommended. This FSR is ideal for applications where the trend or presence of force is more critical than an absolute, calibrated weight value.

What is the operating temperature range of the RP-S40-LT?

The sensor is rated for continuous operation from -40°C to +85°C. This wide temperature tolerance allows for reliable performance in harsh environments, including outdoor applications, industrial settings, and automotive interiors, where temperature fluctuations are common.

Package Includes

  • 1 x Force Sensitive Resistor RP-S40-LT (10g-20kg)

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