Featuring 21 TTL compatible digital I/Os shared with 7 10-bit A/D pins, you can be up and running in no time. Pin compatible with the Arduino PRO. The BASIC compiler is easy to learn, or the pre-configured C compiler is easy to use. Unleash the power of a 32 bit processor, running at 60 MHz to solve your control problem. Save time with built in support for PWM, SPI, 1-Wire, I2C, Pulse timing, Synchronous and Asynchronous serial protocols. If this is your first board purchase, we suggest you start with an .