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The 2.2-inch Flex Sensors are commonly used in Robotic Gloves and other Robotic Control applications. It can be used to analyse how much material is being bent. This flex sensor is 2.2” long and has two output leads that act like a variable resistor. The resistance between two pins changes based on how much the sensor is bent. It is commonly used along with another resistor to build a voltage divider circuit and then obtain a variable voltage based on the change in resistance of the sensor.
The flex sensor is a bend-detecting sensor that has got numerous applications in robotics, medical and haptic technology. The resistance of these sensors changes in accordance with the bend, which can be measured using any microcontroller.
This is a simple 2.2" long flex sensor that can be used/interfaced with an Arduino. As the sensor is flexed, the resistance across the sensor increases. The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of the bend). The connector is 0.1" spaced and breadboard friendly.
Note: Please refrain from flexing or straining this sensor at the base. The usable range of the sensor can be flexed without a problem, but care should be taken to minimize flexing outside of the usable range. For best results, securely mount the base and bottom portion and only allow the actual flex sensor to flex.
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A flex sensor changes its resistance based on how much it is bent. When the sensor is straight, it has a lower resistance. As the sensor bends, the conductive ink inside stretches, increasing the resistance. This change in resistance can be measured using a microcontroller (like Arduino) to detect the amount of bend or motion.
Below is a simple voltage divider setup to read sensor values:
int flexPin = A0;
void setup() {
Serial.begin(9600);
}
void loop() {
int sensorValue = analogRead(flexPin);
Serial.println(sensorValue);
delay(100);
}
| Feature | 2.2-inch Flex Sensor | 4.5-inch Flex Sensor |
|---|---|---|
| Size | Compact (2.2 inches) | Larger sensing area (4.5 inches) |
| Bend Sensitivity | Good for small bends and finger motions | Higher bend sensitivity due to longer surface |
| Applications | Finger tracking, gloves, small wearables | Arm/leg motion tracking, larger robotics |
| Mounting Space Needed | Fits in compact builds | Requires more space for installation |
| Cost | More affordable | Slightly higher cost due to size |
| Flex length | 5.6 cm |
| Total Length | 2.2" (7 cm) |
| Life Cycle | >1 million |
| Height | 0.43mm (0.017?) |
| Power Rating | 0.5 Watts |
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