Square Force Sensitive Resistor 38.1mm

A force-sensitive resistor (FSR) is a genuinely simple sensing principle - its internal resistance changes measurably as physical pressure on its sensing area increases, so wiring it into a voltage divider with a fixed resistor lets a microcontroller's analog input read applied force as a voltage that scales with pressure. Covering a wide range from under 1.5 psi to over 150 psi (roughly 100g to 10kg of applied force across its 1.75 x 1.5 inch sensing area), it handles everything from a light touch to a genuine grip or step.

A fast 1-2 millisecond response time means it tracks quick presses and releases rather than lagging behind real interaction, and a rated lifetime over 10 million actuations gives it real durability for something meant to be pressed repeatedly rather than a one-off sensor. Peel-and-stick rubber backing makes mounting it onto a surface straightforward, and the 0.1-inch pin pitch drops directly onto a standard breadboard.

Common uses are pressure-sensitive touch pads and buttons in interactive art and musical instrument projects, weight-detection applications (is something present, roughly how heavy), and grip-strength or pressure-measurement projects in robotics and wearable devices.