BLE4.0 HM-11 module is a low energy Bluetooth solution. Actually, it can not only act as BLE transceiver& recivers,as the demos on Arduino, it can be also used as controller.     In order to help users learning and using this module, we developed this BLE4.0 Node kit. With different firmware, the node kit can be used as different applicationd. The default firmware is a “temperature sampling system”, connect a DS18B20 sensor to the right pin, this node would sample the current temperature and transceiver the data via BLE4.0. with the low-energy mode, this node can be also a prototype of Anti-lost system.