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CJMCU-103 Rotary Angle Sensor Potentiometer Module

CJMCU-103 Rotary Angle Sensor Potentiometer Module

₹119.00Price
📌 What is CJMCU-103?
The CJMCU-103 is a rotary angle sensor module based on a 10kΩ potentiometer used to measure the angular position of a rotating shaft.
👉 It converts rotation into a variable analog voltage
👉 Acts as a position sensor
✔ Commonly used in robotics, automation, and control systems
⚙️ Working Principle
  • Based on a rotary potentiometer (variable resistor)
  • When the shaft rotates:
    • Resistance changes
    • Output voltage changes proportionally
Process:
  • Rotate the shaft
  • Internal wiper moves across resistive track
  • Voltage at output pin changes
  • Microcontroller reads analog value
✔ Converts mechanical rotation → electrical signal
🔌 Pin Configuration
Typical 3-pin interface:
  • VCC → 3.3V – 5V
  • GND → Ground
  • OUT → Analog output
✔ Compatible with Arduino, ESP32, etc.
🔄 Output Behavior
  • Output is analog voltage (0V to VCC)
  • Rotation changes voltage linearly
👉 Example:
  • 0° → 0V
  • Mid angle → ~2.5V
  • Max angle → ~5V (if powered by 5V)
✔ Requires ADC (Analog-to-Digital Converter)
📊 Technical Specifications
  • Operating Voltage: 3.3V – 5V
  • Resistance: 10kΩ
  • Rotation Range:
    • Electrical: 0° – 300°
    • Mechanical: up to ~333°
  • Linearity: ±2%
  • Resistance Tolerance: ±30%
  • Operating Temperature: -40°C to +85°C
  • Output Type: Analog voltage
🧠 Internal Components
  • Murata SV01A103 potentiometer
  • MCP6002 op-amp buffer
  • RC low-pass filter (noise reduction)
✨ Key Features
  • Smooth and continuous rotation sensing
  • Analog output for precise control
  • Built-in filtering for stable signal
  • Compact and lightweight
  • Dust-proof design for reliability
🛠️ Applications
  • Robot arm position control
  • Steering angle measurement
  • Motor shaft position sensing
  • Volume/brightness control knobs
  • Industrial automation systems
  • RC and joystick controls
⚡ Advantages
  • Simple and low-cost
  • High reliability (long life cycles)
  • Easy to interface
  • Smooth output without steps
⚠️ Limitations
  • Limited rotation (not 360° continuous)
  • Mechanical wear over time
  • Analog noise may require filtering
  • Lower precision compared to encoders
💡 Important Notes
  • Use analogRead() in Arduino
  • Avoid applying excessive force on shaft
  • Use stable power supply for accurate readings
  • Suitable for absolute position sensing, not rotation counting
🧾 Summary
The CJMCU-103 Rotary Angle Sensor is a:
✔ Potentiometer-based angle sensor
✔ Provides analog voltage output
✔ Measures shaft position up to ~300°
👉 Ideal for:
  • Robotics
  • Control systems
  • Analog input projects
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