I have updated the code to my Arduino DDS VFO sketch so the current set frequency is stored in EEPROM and recalled again upon boot-up. The code is 100% drop-in compatible with the old code and no re-wire is required. Simply upload the new sketch and your done. The frequency writes to the EEPROM after 3 seconds without changing. This was required so as not to overload the EEPROM as there are a finite amount of writes (100,000) before it may go bad. You can alter the delay time in my code as it is well documented.
View the entire project page for more details. If you have additional questions… just ask!