RS sells tiny Arduino board with Wi-Fi

Arduino Yun Mini

The Arduino Yun Mini is a smaller redesign of the Arduino Yun Wi-Fi microcontroller board so that it can be used for prototyping products requiring a Wi-Fi interface.

The Yun Mini has PCB dimensions of 71.1mm x 22.9mm, which is less than half the area of the Arduino Yun PCB. A USB connector extends the length to 73mm.

The board has an ATmega32u4 microcontroller and the Qualcomm Atheros AR9331 system-on-chip IC with a MIPS 24K CPU, which operates at up to 400MHz and supports a Linux distribution based on OpenWRT called Linino.

A bridge library enables communication between the two processors, providing Arduino programs the ability to run shell scripts, communicate with network interfaces and receive information from the AR9331 processor.

The board has built-in WiFi (IEEE 802.11b/g/n operation up to 150Mbit/s) and supports 20 digital input/output pins, seven of which can be used as PWM outputs and 12 as analogue inputs.

Other specifications include a 16MHz crystal oscillator, a micro-USB connector, an ICSP header, two reset buttons and one user button.

It has been designed to be similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB communication, without the need for a secondary processor, which allows the Yun Mini to appear to a connected computer as a mouse and keyboard, as well as a virtual (CDC) serial/COM port.

The Yun Mini can be customised from a choice of up to two out of three available accessories, which are the dogRJ45, the dogUSB and the dogUSB eMMC.

The dogRJ45 is a 10/100Mbps Ethernet port; the dogUSB is a USB A type connector with USB 2.0 hub that features a slot for a mini SD to extend the memory of the board; and the dogUSB eMMC is a USB port type A with an integrated 4GB of Flash.

The board can be powered via the micro-USB connection with 5Vdc, which is the recommended option.