Specifications:
This is a 4.5 "bending sensor. The bending degree of the sensor can be converted into a change in resistance value, and the greater the bending, the higher the resistance.
This sensor can be used to make energy gloves, see the application link for details.
Attention: Bending direction: The side with words is the inner side during bending. Avoid bending the end pin part (i.e. non bending sensing part) when using, otherwise it may cause damage.

Technical Specifications
Resistance in a straight state: 25K ohms
Resistance value tolerance: ± 30%
Bending resistance change: 60K~110K ohms
Rated power: 0.5 watts
Peak power: 1 watt
Bending life:>1 million times
Working temperature: -35 ° C~ 80 ° C
Length x width: 73.66x6.35mm
Interface type: 2-Pin metal pins (spacing 0.1 ")
The torsion sensor， 4.5"long， was used in an electronic glove.When the metal of the sensor is bent outward， the resistance of the sensor changes and the curvature can be detected.
Non-bending state resistance：~9000ohms 90 degree bending resistance：~14000ohms
180 degree bending resistance：~22000ohms

How to use the sensor module
1. Connect the Flex sensor to the sensor module, supply power to the module VCC (3.3V or 5V), and connect the AO port to the single chip ADC acquisition port (the ADC reference voltage needs to be consistent with the module supply voltage)
2. Modify the variable VCC in the test routine to the power supply voltage value (unit V), burn the AO test routine
const float VCC = 5.0V; // module supply voltage, ADC reference voltage is V
3. Open the serial debugging assistant (baud rate 9600), you can see the current printed resistance value. Record the resistance value (unit Ω) at the horizontal and maximum torsion to be measured
4. After correcting the values of the horizontal resistance variable STRAIGHT_RESISTANCE and the maximum bending degree BEND_RESISTANCE in the test routine, re-burn the test routine
const float STRAIGHT_RESISTANCE = 37300.0; // The resistance value when straight
const float Bend_RESISTANCE = 90000.0; // The resistance value when bent at 90 degrees