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Force-Sensing Resistor: 1.5″ Square

SKU: POLOLU-1645

$13.97 AUD, inc GST
$12.70 AUD, exc GST

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Force-Sensing Resistor: 1.5″ Square
13.97 AUD

SKU: POLOLU-1645

$13.97 AUD, inc GST
$12.70 AUD, exc GST
In stock, with a short lead time. 593 units dispatch in 4 to 9 days (in addition to the shipping method you choose). Our timing and stock is accurate. Delivery to you by Mon, 28th of Aug with Express Post within Australia.

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Overview

This force-sensing resistor (FSR) from Interlink Electronics is a passive component that acts as a variable resistor, with resistance decreasing in response to increasing applied force, which makes it easy to add a touch interface to your project or create a robot with much more sophisticated tactile senses than are possible with simple lever switches. The polymer thick film (PTF) device is optimized for use in human touch control of electronic devices and can sense an applied force anywhere in the active area ranging from a few dozen grams to a few kilograms (0.2 N to 20 N).

In Pololu's tests, the resistance exceeded 1 MΩ with no applied pressure and dropped to a clearly detectable and very stable 50 kΩ with a 20 g weight placed on it. Pushing on the pad as hard as possible dropped the resistance to around 200 Ω. This resistance range is well suited to work directly with the internal pull-ups of many microcontrollers such as AVRs and PICs. The FSR was responsive enough and sensitive enough to distinctly pick up light, rapid finger taps, and it was even able to pick up the vibrations of a small vibration motor placed on it on the motor’s side.

Force-sensing resistor (1.5″ square), bottom side with masked adhesive backing.

The 1.72″ square pad is flexible, light (1.2 g), and extremely thin (0.02″), and it has an active sensing area of 1.56″ × 1.56″. It does not appreciably compress when pressure is applied. The FSR has a masked adhesive backing for easy mounting, and the 1.7″ flexible leads give you a convenient way to integrate the part into your project. The two male pins (called “solder tabs”) have a 0.1″ spacing, which means they are compatible with most solderless breadboards and perfboards, though the solder tabs are too short to work well with many 0.1″ connectors.

Note that this FSR is not a load cell or strain gauge, and it is not suitable for precision force measurements. While it can be used for high-resolution dynamic measurement, only qualitative results are generally attainable. Force accuracy ranges from 5% to 25% depending on a number of factors, and the resolution is better than 0.5% of the full range. Please see the resources tab for more information, including force-vs-resistance curves, integration notes, usage tips, and suggested electrical circuits.

A variety of force-sensing resistors (FSRs).

FSR/FSLP versions

Interlink refers to this product as part number FSR 406 in their FSR 400 series. Pololu have eight versions of force-sensing resistors available, which lets you choose the one with the dimensions that best suit your application:

Note that the last two sensors in this list are FSLPs (force-sensing linear potentiometers) that let you detect both the amount of applied force and where on the strip the force was applied.

Example applications

  • Pressure-sensitive touch user interface
  • Tactile sensor for robotic appendages
  • Drum pad for an electronic instrument
  • Alarm system sensor:
    • alert when an object is removed
    • alert when intruder steps on it
Documentation and Resources:

Product Comments

We deliver Australia-wide with these options:

  • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.32 for Express Post (1-2 days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

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Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

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