RP-C10-LT Force Sensitive Resistor (20g-3kg)
🔍 What this sensor is
The RP-C10-LT Force Sensitive Resistor (FSR) is a thin, flexible pressure sensor that detects force or touch intensity.
👉 In simple words:
➡️ It works like a pressure-sensitive button (but analog)⚙️ Working Principle
It is a resistive sensor
When you apply force:
Resistance decreases
Output voltage changes
👉 More force = lower resistance
➡️ It behaves like a variable resistor controlled by pressure
⚙️ Key Specifications
Force Range: 20g to 3kg
Type: Analog (resistance-based)
Thickness: ~0.3–0.4 mm (very thin)
Response Time: <10 µs (very fast)
Lifetime: >1 million presses
Operating Temp: -40°C to +85°C
Idle Resistance: >10MΩ
🔌 Pinout
Very simple (2 terminals):
Pin 1 → VCC (through resistor divider)
Pin 2 → Analog input (A0)
👉 Needs a voltage divider circuit to work with Arduino
🧠 Output Behavior (VERY IMPORTANT)
| Force Applied | Resistance | Output |
|---|---|---|
| No force | Very high (>10MΩ) | ~0 |
| Light touch | Medium | Small voltage |
| Strong press | Low | High voltage |
👉 Output is non-linear (not perfectly proportional)
💡 Applications
👆 Touch pressure detection
🖐️ Force sensing (robotics grip)
🪑 Smart seating / weight detection
🎮 Pressure-sensitive buttons
🦾 Wearables (shoe pressure, posture)
📱 DIY touch interfaces
⚡ Special Features
✔️ Ultra-thin & flexible
✔️ Fast response
✔️ Low power consumption
✔️ Easy to integrate
⚠️ Important Notes (VERY IMPORTANT)
❗ 1. Not highly accurate
Good for relative force, not exact measurement
Not for precise weighing
❗ 2. Non-linear response
Requires calibration for better results
❗ 3. Sensitive to placement
Force must be applied on active area only
❗ 4. Not durable under heavy load
Avoid constant high pressure
🆚 FSR vs Load Cell
| Feature | FSR (RP-C10-LT) | Load Cell |
|---|---|---|
| Accuracy | Low | ⭐ High |
| Cost | Cheap | Higher |
| Output | Analog | Needs amplifier |
| Use | Touch/pressure | Weight measurement |
👍 When to use this
Use RP-C10-LT if you want:
Simple pressure detection
Touch-sensitive interface
Low-cost force sensing
👎 When NOT to use
Avoid if you need:
Accurate weight measurement
Industrial precision
🧠 Final Understanding
👉 This sensor = “pressure-sensitive resistor”
👉 Best for detecting force changes, not exact values
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