VFO-001

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VFO-001 P132-720px.jpg

Features

Schematic

VFO-001-SCHEMATIC.PNG

Parts

Blue Pill Card

STM32F103C8T6-Blue-Pill-Pin-Layout.gif

  • 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

Si5351 003 720px.jpg

OLED128x32.PNG

Arduino Library for OLED

U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED
  u8g2.setFont(u8g2_font_ncenB14_tr);
Hello World Code
U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED

void setup(void) {
  u8g2.begin();
}

void loop(void) {
  u8g2.clearBuffer();			// clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr);	// choose a suitable font
  u8g2.drawStr(0,10,"Hello World!");	// write something to the internal memory
  u8g2.sendBuffer();			// transfer internal memory to the display
  delay(1000);  
}

Rotary Encoder/Breakout Board

RotaryEncoderCAD.PNG


Si5351 004 720px.jpg

Si5351 Frequency Generator

Si5351 001 720px.jpg

VFO3.PNG

  • I2C Daisy-chain connector
  • 3 outputs
  • Heat shrinked assembly with cables

Measurements

  • 10 MHz FFT
    • Square wave has high odd harmonic content

10MHz VFO FFT-01.png

Libraries/Example Code

Videos