View source for VFO-002

'''This is a work in process '''

[[File:VFO-002-2.png]]

== Features ==

* Software controlled VFO
* Blue Pill Microprocessor
** STM32F103 32-but ARM RISC CPU
** Arduino compatible
** 3.3V I/O
* Detachable Rotary Encoder/OLED card
** SSD1306 OLED Display
*** I2C Interface
** Controls frequencies with rotary encoder
** 100 Hz, 1 KHz, 10 KHz, 100 KHz, 1 MHz, 10 MHz steps (software controllable
* Si5351A Oscillator
** 3 Outputs
** 25 or 27 MHz crystal
** I2C Interface
* Power
** MINI-360 DC/DC Buck regulator
** 7-24 VDC
* Fits in standard extruded enclosures

== Parts ==

=== Blue Pill Card ===

* [[STM32|Blue Pill Card]]

[[File:STM32F103C8T6-Blue-Pill-Pin-Layout.gif]]

* 3.3V operation work without level shifters for I2C
** OLED can run from 3.3V
** Si5351 can only run from 3.3V
* Used right angle headers and Dupont cables
* Replaced BOOT 0,1 jumpers
** Jumper on BOOT1
** Switch on BOOT0 - easier to download code
* Download via serial
* Arduino IDE

=== OLED ===

==== 128x32 OLED ====

* [https://www.ebay.com/itm/2pcs-0-91-128x32-IIC-I2C-White-OLED-LCD-Display-DIY-Module-For-Arduino/293688288048?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Ebay]

[[File:OLED128x32.PNG]]

==== 128x64 OLED ====

* Rotated

==== Arduino Library for OLED ====

* [https://github.com/olikraus/u8g2 U8g2: Library for monochrome displays, version 2]
** [https://github.com/olikraus/u8g2/wiki/u8g2reference Reference library]
** Constructor
<pre>
U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED
</pre>
* [https://github.com/olikraus/u8g2/wiki/fntlistall List of Fonts]
<pre>
  u8g2.setFont(u8g2_font_ncenB14_tr);
</pre>

===== Hello World Code =====

<pre>
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);  
}
</pre>

=== Rotary Encoder ===

* Includes pushbutton Switch
* Includes Pull-Up resistors
* Needs R/C filter on output for debounce
* [https://playground.arduino.cc/Main/RotaryEncoders/ Reading Rotary Encoders] - Arduino reference
* [https://github.com/mprograms/SimpleRotary Simple Rotary Encoder Arduino library]
* [http://www.mathertel.de/Arduino/RotaryEncoderLibrary.aspx Library for the Arduino environment for using a rotary encoder as an input]

=== Si5351 Frequency Generator ===

* I2C Daisy-chain connector
* 3 outputs
** Tx
** Rx (may not need to use separate output)
** BFO - could be adjusted

=== Mini-360 Buck Converter ===

* Power from 7-23 VDC in
* 5V out

[[File:mini-360-power-regulator.jpg]]

[[File:Mini-360-Dimensions-01.PNG]]

== Enclosure ==

== 100x76x35mm Black Aluminum Enclosure ===

* [https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2386202.m570.l1313&_nkw=100x76x35mm+Aluminum&_sacat=0 ebay search term]

[[File:box-100x76x30-Mechs.png]]

== Schematic ==

== Mechanicals ==

[[File:VFO-002_Mechanicals.PNG]]

== Libraries/Example Code ==

* [https://github.com/land-boards/lb-Arduino-Code/tree/master/STM32/VFO_Si5351 Land Boards Application]
* [https://github.com/pu2clr/VFO_BFO_OLED_ARDUINO VFO and BFO with Si5351A, OLED and Arduino]
* [https://github.com/olikraus/u8g2 U8g2: Library for monochrome displays, version 2]
* [https://github.com/etherkit/Si5351Arduino Si5351 Library for Arduino]
* [https://github.com/andrey-belokon/Syntez_Si5351_Si570 Universal Digital VFO Si570/Si5351]
* [https://github.com/adafruit/Adafruit_Si5351_Library Adafruit_Si5351]
* [https://github.com/NT7S/Si5351 Si5351 Library for avr-gcc]
* [https://github.com/prt459/Arduino_si5351_VFO_Controller_Keyer vk3hn_VFO_controller]
* [https://github.com/pu2clr/BFO Simple BFO with si5351 controlled by Arduino]

== Videos ==

<video type="youtube">58G5atwBX2M</video>

<video type="youtube">ZkfQFdTcnG8</video>

<video type="youtube">fJ_3z2IAjKg</video>

<video type="youtube">pFDvcIk5EAk</video>

<video type="youtube">jRNrPIrgWto</video>

* [https://www.youtube.com/c/CharlieMorrisZL2CTM/videos Charlie Morris YouTube channel]

== Assembly ==

[[VFO-002 Assembly]]