‘Flex Sensor’ or ‘Bend Sensor’ is a sensor that changes its resistance depending on the amount of bend on the sensor. They convert the change in bend into electrical resistance – the more the bend, the more the resistance value.Flex sensors are widely used in various applications such as – Automotive controls, Medical Devices, Fitness Products, Virtual Reality gaming consoles, Animatronics, Robotics, etc.This tutorial aims to provide a detailed guide to flex sensor and its interfacing with Arduino.