Square shaped Force Sensor

🧠 What Is a Square Force Sensor?
A force sensor that detects applied pressure or force on its surface.
Square-shaped versions are commonly FSR (Force Sensitive Resistor) sensors.
Output changes based on how much force is applied — not just ON/OFF, but variable.
🔍 Key Features
Shape: Square sensing area (better for uniform pressure detection)
Thin & Flexible: Can be placed under surfaces or embedded in devices
Analog Output: Resistance changes with applied force
Lightweight & Durable
Wide Force Detection Range
Easy Interface with microcontrollers (Arduino, ESP32, etc.)
📊 Technical Specifications (Typical)
Parameter
Value
Operating Voltage
3.3 V – 5 V (via voltage divider)
Output Type
Analog (variable resistance)
Force Range
~100 g to 10 kg (varies by model)
Response Time
<10 ms
Thickness
~0.5 mm
Resistance (No Force)
>1 MΩ
Resistance (Full Force)
~1 kΩ – 10 kΩ
⚙️ How It Works
The sensor has a conductive polymer layer.
When force is applied, resistance decreases.
The change in resistance is converted into a voltage using a voltage divider.
A microcontroller reads this voltage via an analog input (ADC).
🔌 Basic Connection
One terminal → VCC (through resistor)
Other terminal → Analog pin + GND (via voltage divider)
📌 Typical setup:
Use a fixed resistor (10kΩ) to form a voltage divider.
🧠 Working Behavior
No Force → High Resistance → Low Output Voltage
More Force → Lower Resistance → Higher Output Voltage
(Non-linear response — requires calibration for accurate force measurement)
📌 Applications
Pressure sensing pads
Touch-sensitive buttons
Weighing (approximate force measurement)
Robotics grip sensing
Smart shoes / foot pressure analysis
Human-machine interaction devices
⚠️ Important Notes
Not Highly Accurate: Best for relative force, not precise weight measurement.
Non-linear Output: Requires calibration for better results.
Wear Over Time: Repeated pressure can reduce lifespan.
Temperature Sensitive: Readings can vary slightly with temperature.
🛠 Summary
Type: Force Sensitive Resistor (FSR)
Output: Analog (via resistance change)
Shape: Square sensing area
Use Case: Pressure/force detection in interactive and embedded systems