Mini Display Encoder Testing Tool

Overview

A diagnostic device developed for US Digital that provides real-time visualization and testing capabilities for various types of encoders. This tool supports multiple encoder interfaces including QEI (Quadrature), Analog, and PWM, making it an essential troubleshooting instrument.

Features

• Multiple encoder interface support:
  • Quadrature Encoder Interface (QEI)
  • Analog voltage reading
  • PWM signal processing (10-bit and 12-bit)
• Real-time position display
• Index signal detection
• Moving average filtering for stable readings
• Interactive mode selection
• Reset functionality
• SSD1306 OLED display interface

Hardware Requirements

• Arduino-compatible microcontroller
• SSD1306 OLED Display (128x32 pixels)
• Pin Connections:
  • MOSI: Pin 11
  • CLK: Pin 12
  • DC: Pin 9
  • CS: Pin 10
  • RESET: Pin 8
  • Button 1: Pin 2
  • Button 2: Pin 3
  • Encoder A: Pin 4
  • Encoder B: Pin 5
  • Index: Pin 6
  • PWM Input: Pin 7
  • Analog Input: A0

Software Dependencies

• SPI Library
• Wire Library
• Adafruit_GFX Library
• Adafruit_SSD1306 Library
• Bounce2 Library
• Encoder Library

Operating Modes

QEI Mode

• Displays quadrature encoder position
• Supports index signal reset
• Real-time position updates

Analog Mode

• Voltage measurement (0-5V range)
• Moving average filtering
• 3-decimal precision display

PWM Mode

• Supports both 10-bit and 12-bit resolution
• Duty cycle measurement
• Position calculation
• Filtered readings with moving average

Usage Instructions

1. Power on the device
2. Use Button 1 to cycle through available modes
3. Press Button 2 to select desired mode
4. In QEI mode, Button 2 acts as reset
5. Display automatically updates with current readings

Development

• Written in Arduino C++
• Modular design for easy maintenance
• Debounced button inputs
• Interrupt-driven index detection

Troubleshooting Features

• Real-time signal monitoring
• Noise filtering through averaging
• Visual feedback for all measurements
• Auto-scaling display for different modes

Contributing

This is a capstone project developed for US Digital. For modifications or improvements, please submit a pull request.

License

[Insert appropriate license information]

Acknowledgments

• US Digital for project sponsorship
• Adafruit for display and sensor libraries