‘RELAY 2 ON’ and the door responds accordingly. Building just one of his boards cost [Thomas] the meager sum of $43. Considering the new Arduino Ethernet board costs around $60, we’re ...

This board also features 128 MB of RAM, 8MB of Flash and the usual compliment of Arduino pins in a Leonardo-compatible layout. Also on the SoC is a PCIE bus, Ethernet, a USB 2.0 host, and an SD card.