VFO-001

Features

• SDD1306 OLED Display
  • I2C Interface
  • OLED runs from 3.3V (can run from 5V but this use has 3.3V)
• Rotary Encoder Break Out Board
• Arduino Pro Mini
  • Arduino compatible
  • 3.3V
  • Programmed via Arduino IDE
    • Download via serial
• Si5351 Oscillator Breakout Board
  • 10 KHz - 40 MHz tuning range
    • 1Hz/10Hz/100Hz/1KHz/10KHz/100KHz/1MHz/10MHz steps
  • I2C Interface
  • 3 Outputs
  • 27 MHz crystal
  • 3.3V operation works without level shifters for I2C*
  • Si5351 can only run from 3.3V
  • Used right angle headers and Dupont cables for low profile
• Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm - Out of stock
• Mini-360 Buck Regulator
  • 5V-23V input
  • 3.3V output

Schematic

Parts for Reference

Blue Pill Card

• Blue Pill Card

Build

• Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm - Out of stock

• BNC/Power Jack placement

• Rear panel BNCs and power jack

• Drill holes and nibble out for OLED cutout
  • A bit rough
  • Better to undercut nibble and file to size

• OLED fitted

• Final

Libraries/Example Code

Land Boards Code

• Land Boards Application

Libraries used in this app

• U8g2: Library for monochrome displays, version 2
• Si5351 Library for Arduino
• Rotary Encoder - Software debounced

Other Si5351 Libraries

• Universal Digital VFO Si570/Si5351
• Adafruit_Si5351
• Si5351 Library for avr-gcc
• vk3hn_VFO_controller
• Simple BFO with si5351 controlled by Arduino
• VFO and BFO with Si5351A, OLED and Arduino

Videos

• Charlie Morris YouTube channel