Above you can see [Hans’] creation next to the official Arduino USB-to-serial programmer. He used the same connection scheme, but went with an edge connector for the USB instead of using a mini ...

Eight digital outputs act as the parallel interface. When a byte is received over serial, the individual bits are set on the individual digital lines connected to the printer’s parallel port.

Another difference between the Rev3 and R4 WiFi is the number of their serial ports and I2C buses. The Rev3 has a single serial connection, shared by the USB port and the RX/TX pins.

Fancy a retro twist to your next Arduino-based project? One Gadget Master has turned an Uno into a punch card-controlled computer, which outputs the results on its serial port.

Developers, makers and hobbyists looking for a mini PC that is a Arduino compatible might be interested in the newly launched pcDuino3 Nano which is now available to purchase for just $39.

For $30, Intel's Arduino 101 board provides an easy path for makers to build a wearable computer, a mini-robot or a smart appliance for the home.