Force-sensitive resistors (FSRs) are useful for detecting applied force such as pressure, squeezing, or weight. They are inexpensive, straightforward to integrate into projects, and provide a variable resistance in response to force. This particular unit is an Interlink 34-00013 Model 406 FSR, featuring a 38mm square active sensing area and female tine contacts. Keep in mind that it can only measure the amount of pressure, not the exact position of the press.

This variant features female tin contacts (TE 2-487406-4). A version fitted with solder tabs is also available.

An FSR behaves much like a resistor whose value changes with pressure: the harder it is pressed, the lower its resistance becomes. Although affordable and easy to use, they should not be relied upon for precision. Unit-to-unit variation of around 10% is typical, and while they can register weight, they are not suitable for accurately determining specific weight values.

These sensors are constructed from thin plastic layers, and the connection is attached to a fragile substrate. We don't recommend soldering this version of the sensor, crimping is your best option, or sourcing a suitable housing (the crimp connector is a TE 2-487406-4).

For wiring diagrams, code samples, and project inspiration, take a look at Adafruit’s FSR tutorial page.

Specifications