Nano VFO for portable TRX

CPU: Arduino ProMini
PLL: Si5351 or/and Si570
Display: OLED 0.91" 128x32, OLED 0.96" 128x64, OLED 1.3" 128/132x64, I2C LCD 1602, MAX7219
Encoder: optical/mechanic rotary encode Keypad: 0..6 buttons Support different TRX architecture:

1. Single IF superheterodyne.
2. Direct conversion with 2x or 4x output.
3. Direct conversion with quadrature output. Builtin CW key: auto/iamboc mode, 3 phrase memory, CW-VOX, touch mode

Project homepage http://dspview.com/viewtopic.php?t=202 Required libraries:

1. UR5FFR_Si5351 https://github.com/andrey-belokon/UR5FFR_Si5351
2. SSD1306Ascii - install from Arduino IDE

What's new in version 2.0

1. Save current freq/band to EEPROM and restore on star
2. Improved encoder unit. 4x increase pulses for mechanical encoder
3. New Si5351 library
4. Change power to 5v without I2C level conversion
5. Many minor bugfixes

Copyright (c) 2016-2020, Andrii Bilokon, UR5FFR
License GNU GPL, see license.txt for more information