Month: December 2013

Plug and Play DDS VFO with arduino

I have been trying to program  cheap Chinese DDS modules recently.   I wanted to  add a DDS VFO to one of my bitx rigs. These modules are available  at $4.5 from aliexpress. They claim that it can work up to 40Mhz.

I used an arduino Uno along with a rotary encoder for  controlling the module. The DDS module pin out is shown below.

 

DDS_module_pinout

The connections to arduino and rotary encoder is  shown below.

 

dds_bb

 

 

You can download the code hosted on github from  here. 

The code is for 40m VFO    with IF of 9Mhz.  You can easily modify it for other  bands and IFs. Additional functions can be programmed easily.

The DDS modules  are available on line form from many sources. The rotary encoder can be obtained from element14.