simpleDDS

Simple software DDS based on Arduino, OLED, and rotary encoder

1. Purpose

Simple DDS is designed to use test of oscilloscopes, but it can be used as a general oscillator.

2. Specifications

• 2 x Sin wave (Up to 2KHz)
• 2 x Square wave (sync with sin wave)
• 2 x Square wave (Up to 8MHz)

3.Schematic

4. BOM

1. Arduino Uno (or compatible)
2. Rotary encoder with switch
3. 128x64 I2C OLED
4. 2 x RC Filter

• I used three stage low-pass filter (1K + 100nF) for test

5. breadboard or Universal PCB
6. several wires
7. XY Oscilloscope for test

5. Usage

• Main Menu: channel select
  • -> Sub Menu: chennel parameter
    • -> change frequency
    • -> change phase (sin only)
    • -> return to main menu

6. Snapshots