> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Square Force-Sensitive Resistor (FSR) - Interlink 406

**Type:** Product page · **SKU:** ADA1075 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/square-force-sensitive-resistor-fsr-interlink-406.html ([markdown](https://core-electronics.com.au/square-force-sensitive-resistor-fsr-interlink-406.html.md))

## Retired product

This product is retired and no longer available for purchase. Search the catalogue for an alternative.

## How to buy

- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

FSRs are sensors that allow you to detect physical pressure, squeezing and weight. They are simple to use and low cost. This sensor is a Interlink model 406 FSR with a 38mm square sensing region. Note that this sensor can't detect *where* on the square you pressed (for that, [check out Adafruit's ribbon soft pots](https://core-electronics.com.au/#) or [capacitive touch pad](https://core-electronics.com.au/capacitive-trackpad-touchpad-microcontroller-friendly-ps-2.html) ).
 
 FSRs are basically a resistor that changes its resistive value (in ohms Ω) depending on how much its pressed. These sensors are fairly low cost, and easy to use but they're rarely accurate. They also vary some from sensor to sensor perhaps 10%. So basically when you use FSRs you should only expect to get ranges of response. While FSRs can detect weight, they're a bad choice for detecting exactly how many pounds of weight are on them.
 
 FSRs are made of plastic and the connection tab is crimped on delicate material. The best way to connect to these is to simply plug them into a breadboard or use a clamp-style connector like alligator clips, female header, or a terminal block. It is possible to solder onto the tabs but you must be very fast because if your iron is not good quality or you dally even a few seconds, you will melt the plastic and ruin the FSR! **Don't attempt to solder directly to your FSR unless you are absolutely sure you have the skills to do so.**
 
 For a full tutorial with wiring diagrams, code examples and project ideas, please read the FSR tutorial page!

## Technical Details

Dimensions:

- Length: 88mm/3.47
- Width: 43.7mm/1.72in
- Thickness: 0.42mm/0.0165in
- Weight: 1.12g/0.04oz
 
[The FSR datasheet contains force/resistance graphs, diagrams, etc!](https://cdn-shop.adafruit.com/datasheets/FSR400Series_PD.pdf)

 ![](https://core-electronics.com.au/media/wysiwyg/resources/rohs_icon.jpg)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/1/0/1075-00.jpg)