Hardkernel launched a $30 Raspberry-Pi compatible “Odroid-W” wearables oriented SBC, adding eMMC, ADC, RTC, a fuel gauge, and step converters…. At only 60 x 36mm (2.6 x 1.4 inches) and weighing just 8 grams, the Odroid-W is small enough to build a slightly oversized smartwatch.