Despite using a C++11 compiler, Arduino does not implement any of the C++ stdlib, it implements only aspects of the C stdlib and a few of its own extensions. Arduino provides size_t, but not std::size_t.Three phase arduino Februnardiwebs Leave a comment i want to generate 3 PWM 120 degrees out of phase with arduino mega2560 because i want to control six pluse igbt to control 3 phase motor ( 220v/380v // f=50hz // rpm = 1430 ) and display the frequence in LCD.The EME85C DDS board has 6 connections, Switch A/B/C, Encoder A/B, & Gnd. The prototype is shown built on a surplus PC board from a Sony HIFI unit. The control for the EME85 DDS requires a number of diodes, switches, & an ALPs EC16B-24 Rotary Encoder. The software emulates the Yaesu FT817 transceiver, and the microcontroller can be controlled using Ham Radio Deluxe software vie the RS232 connection. HF-DDS Description: The HF-DDS is a complete high performance AD9951/54 DDS and Micro controller with software that can be used to construct a Radio Receiver or Transvceiver.