Flex Sensor 4.5

Flex Sensor 4.5-Inch (Bend / Flex Angle Sensor)

The 4.5-inch Flex Sensor is a flexible, resistive sensor designed to measure bending, flexing, and angular displacement. Its resistance changes proportionally as the sensor is bent, making it ideal for motion detection, gesture recognition, and wearable electronics.

Working Principle

The flex sensor works on the principle of resistive variation. When the sensor is straight, it has a nominal resistance. As it bends, the conductive ink layer stretches, increasing resistance. This resistance change is converted into a voltage signal using a voltage divider circuit and read by a microcontroller’s analog input.

Key Features

• Length: 4.5 inches

• Highly flexible and lightweight

• Resistance increases with bending angle

• Fast response time

• Low power consumption

• Durable and repeatable performance

Electrical Specifications

• Sensor Type: Variable resistor (flex sensor)

• Resistance (Flat): ~10 kΩ (typical)

• Resistance (Bent 90°): ~30 kΩ – 70 kΩ

• Operating Voltage: 3.3 V – 5 V

• Output Type: Analog

Pin Configuration

• Two terminals (non-polarized)

• Can be connected in any orientation

Applications

• Gesture recognition systems

• Robotics and automation

• Wearable devices and smart gloves

• Human–machine interfaces

• Gaming controllers

• Medical rehabilitation devices

• Arduino, ESP32, Raspberry Pi projects

Advantages

• Simple and cost-effective sensor

• Easy to interface with microcontrollers

• Suitable for flexible and wearable designs

• Reliable performance over repeated use

Conclusion

The 4.5-inch Flex Sensor is a versatile and reliable sensing solution for detecting bending and motion. Its simple interface, flexibility, and compatibility with popular microcontrollers make it an excellent choice for IoT, robotics, and interactive electronic projects.