hardware - Arduino to generate a rising waveform (sine or triangle) - Stack Overflow
DDS sine signal generator for AM modulation from 1 Hz to 40 MHz with an AD9850 or AD9851, an ATmega328, and an Arduino firmware | Electronics and Mechanics for Hobbyists
sine wave generator ARDUINO - EasyEDA open source hardware lab
AD9850 DDS Signal Generator Pinout, Interfacing with Arduino, Features