The Flex Sensor changes resistance as it bends, making it ideal for motion sensing, wearable projects, robotics, and gesture-based interfaces where detecting flex or movement is required.
This sensor can detect flexing or bending in one direction. They were popularized by being used in the Nintendo PowerGlove as a gaming interface.
These sensors are easy to use, they are basically resistors that change value based on how much they are flexed. If they're unflexed, the resistance is about ~25KΩ. When flexed all the way the resistance rises to ~100KΩ. They're pretty similar to FSRs so following this tutorial will get you started. You can use an analogue input on a micro-controller (with a pullup resistor) or a digital input with the use of a 0.1uF capacitor for RC timing.
The bottom part of the sensor (where the pins are crimped on) is very delicate so make sure to have strain relief - such as clamping or gluing that part so as not to rip out the contacts!
Features
Detects flexing or bending in one direction
Resistance ranges from approximately 25kΩ when unflexed to 100kΩ when fully flexed
Functions as a variable resistor that changes value based on flex intensity
Compatible with analogue microcontroller inputs using a pull-up resistor
Compatible with digital inputs using a 0.1µF capacitor for RC timing
Requires strain relief on the crimped pin connection to prevent contact damage
Originally popularised by Nintendo PowerGlove gaming interface
