超声波测距资料和测试程度，做这方面的可以用到-Ultrasonic ranging information and test level, this area can be used

TI的CC2630的contiki系统程序(Contiki provides powerful low-power Internet communication. Contiki supports fully standard IPv6 and IPv4, along with the recent low-power wireless standards: 6lowpan, RPL, CoAP. With Contiki's Cont