VFO-001

Features

• DD1306 OLED Display
  • I2C Interface
• Rotary Encoder Break Out Board
• STM32 (Blue Pill Board) Microprocessor
  • Arduino compatible
  • 3.3V
• Si5351 Oscillator Breakout Board
• 10 KHz - 40 MHz tuning range
  • 100Hz/1KHz/10KHz/100KHz/1MHz/10MHz steps
  • I2C Interface
  • 3 Outputs
  • 27 MHz crystal
• Extruded Aluminum Enclosure Box - 94mm x 83mm x 30mm

Schematic

Parts

Blue Pill Card

• Blue Pill Card

• 3.3V operation works without level shifters for I2C
  • OLED runs from 3.3V
  • Si5351 can only run from 3.3V
• Used right angle headers and Dupont cables for low profile
• Replaced BOOT 0,1 jumpers
  • Wire jumper on BOOT1
  • Switch on BOOT0 - easier to download code
• Download via serial
• Programmed via Arduino IDE

128x32 OLED

• Ebay

Libraries/Example Code

Land Boards Code

• Land Boards Application

Used in this app

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

Others

• 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