The flexible pressure sensors are highly adaptable and easy-to-use devices designed to detect the intensity and frequency of applied force. They are widely used in various applications, including pressure switches, bed monitoring systems, intelligent sneakers, and medical devices. These sensors are composed of an ultra-thin film with excellent mechanical properties, conductive materials, and nanometer pressure-sensitive layers, enabling them to convert pressure into resistance effectively.

Features

1. Flexibility and Ease of Use: These sensors are designed for easy application; simply peel off the protective cover and stick the sensor onto the desired surface.
2. High Responsiveness: They are capable of sensing both static and dynamic pressure with a quick response time.
3. Durability: Constructed with robust materials, these sensors are designed to withstand frequent use, with a lifespan exceeding one million activations.
4. Pressure Sensitivity: The sensors convert applied pressure into resistance, with the output resistance decreasing as pressure increases.

Specifications

• Thickness:
  • SEN0293: 0.35mm
• Trigger Force:
  • SEN0293: <20g, triggers when default resistance <200kΩ
• Pressure Measuring Range:
  • SEN0293: 20g to 10kg or larger
• Other Specifications:
  • Initial Resistance: >10MΩ
  • Activation Time: <0.01s
  • Operating Temperature: -40℃ to +85℃
  • Lifespan: >1 million activations
  • Hysteresis: ±10% (1000g force)
  • Response Time: <10ms
  • EMI: None generated
  • EDS: None generated
  • Drift: <5% (1kg force, static load 24h)

Resistance vs. Force

The relationship between resistance and force is illustrated in a graph, showing that the sensor's output resistance decreases as the applied force increases. This sensor is more suitable for qualitative rather than quantitative measurements due to potential data errors in precise quantification.

Sample Project:

the flex sensor is used with an Arduino UNO mainboard to demonstrate how serial port output changes under different pressure conditions.

Requirements

Hardware:

• DFRduino UNO x1
• Thin Film Pressure Sensors x1
• Computer x1
• Dupont Wires

Software:

• Arduino IDE

Connection Diagram and Sample Code

The tutorial provides a connection diagram and sample Arduino code to read the sensor's output. The code reads the analog value from the sensor pin and prints it to the serial monitor, demonstrating how the sensor's output changes with applied pressure.

#define sensorPin A0

void setup() {
  Serial.begin(115200);
}

void loop() {
  int x = analogRead(sensorPin);
  Serial.println(x);
  delay(50);
} 

Expected Results

When the sensor is pressed, the serial data changes linearly with the applied force, demonstrating the sensor's functionality.

Documents: