Abstract: A wireless sensor network includes an aggregator, a control device, a bridge device, and a mesh module. The control device is connected with the aggregator and the bridge device. The mesh module is wirelessly connected with the bridge device and the control device. A mesh network is built by the connections of the mesh module, the bridge device, and the control device. A duty cycle of the mesh module is less than or substantially equal to 10 percent. A command sent by the aggregator is converted into a wireless message by the control device, the wireless message is transmitted by the control device and retransmitted through a first amount of radios and repeated for a second amount of times by the bridge device, so that the wireless message is successfully received by the mesh module. Therefore, a mesh network with high efficiency and low cost is achieved.

Abstract: A wireless sensor network includes an aggregator, a control device, a bridge device, and a mesh module. The control device is connected with the aggregator and the bridge device. The mesh module is wirelessly connected with the bridge device and the control device. A mesh network is built by the connections of the mesh module, the bridge device, and the control device. A duty cycle of the mesh module is less than or substantially equal to 10 percent. A command sent by the aggregator is converted into a wireless message by the control device, the wireless message is transmitted by the control device and retransmitted through a first amount of radios and repeated for a second amount of times by the bridge device, so that the wireless message is successfully received by the mesh module. Therefore, a mesh network with high efficiency and low cost is achieved.

Abstract: A testing apparatus (200) for testing coplanarity of workpieces (50) having protuberant structures (53) includes a working plane (21) and a groove (23) defined on the working plane. The groove is configured to movably receive therein all protuberant structures of the workpieces. A testing method employing the testing apparatus to test coplanarity of workpieces having protuberant structures is also provided.

Abstract: A system for generating reports of coordinate measuring machine includes: a coordinate measuring machine (10), a system control box (11), a computer (12), a typewriter (13), and a database (14). The computer includes: a system interface module (121) providing an operating system of the coordinate measuring machine; a data processing module (122) for processing measured data; and a report generating module (123) for generating reports of coordinate measuring machine. A method of generating reports of coordinate measuring machine is also provided.