Quad Frequency VFO / Clock Generator

This is a quad output variable frequency oscillator. It is based on the Adafruit Si5351A Clock Generator Breakout Board. The fourth output is a simple PWM pin driven by the TimerOne library. The whole thing is controlled by an Adruino (ATmega328).

Outputs

1. 8KHz to 160MHz
2. 8KHz to 160MHz
3. 8KHz to 160MHz
4. 0 to 10KHz

Usage

• Short press on the big button cycles through the outputs
• Long press on the big button enables/disables the current output
• Turning the knob will increase/decrease the value of the current output
• Short press of the knob will cycle through the positions of the current output
• Long press of the knob will zero out the current position of the current output
• Pressing the small button will save the current settings (in the eeprom)
• If nothing is pressed for 10 minutes, a screensaver will appear

Libraries used

• Jason Milldrum's Etherkit Si5351 library: https://github.com/etherkit/Si5351Arduino
• TimerOne library: http://playground.arduino.cc/Code/Timer1
• Oliver Kraus' u8g library: https://github.com/olikraus/u8glib
• Thomas O Fredericks' Bounce2 library: https://github.com/thomasfredericks/Bounce2

Pictures

Assembled:

Breadboard:

Fritzing: