Table 1.

Sun SPOT node technical features as of its latest release [48,49].

Central Processing Unit		Interfaces
Microcontroller	AT91SAM9G20	Types	Digital (GPIO), analogical (ADC), serial (I²C, I²S, SPI0, SPI1, USART)
Memory	1Mbyte RAM, 8Mbytes Flash ROM	Sensors and actuators	Light, Temperature, Accel., 8 LEDs, 2 switches.
Operating System	None (Squawk virtual machine)	Gateway Infrastructure	Mini USB 2.0
Radiofrequency		Others
Transceiver	CC2420	Battery	3.7 V, 770 mAhr Li-Ion rechargeable battery
Data speed	250 Kbps	Power usage (deep sleep/active)	33 uA/104 mA
Range	100 meters (outdoors, antenna-equipped)	Price [50]	314.93 € per kit (two nodes and a base station)