In Arduino 3.0.0 there is a new feature called Peripheral Manager. In the specific case of SPI, when any of its 4 pins (MOSI, MISO, CLK and CS) are used for any other function, for instance, with ...

For the Nano that I used to test on, I assigned AUX1 to digitial pins 5-8 (bits 0-3) and AUX2 to pins 9-12 (bits 0-3) There is also code here (currently not active, needs to be adapted to Arduino) to ...

An Arduino is allowed by the DTR pin to auto-reset when a new Sketch is downloaded. This is a nice feature to have and without having to hit the reset button, it allows a Sketch to be downloaded. The ...