在一個(gè)多節(jié)點(diǎn)的無線氣象站集成芯片的pic24fj192單片機(jī)

　　嵌入式的世界我們生活是從不同的MCU和CPU千共同發(fā)展。為了支持?jǐn)?shù)據(jù)和信息的自由流動(dòng)，許多網(wǎng)絡(luò)是相互連接的，常常是無線的。這種數(shù)據(jù)交換提供了一種更方便、更安全的生活方式。價(jià)格Digi-Key的氣象中心說明了各種微控制器可以連接無線通信手持智能手機(jī)。天氣中心是太陽能供電，具有多種單片機(jī)和無線傳感器網(wǎng)絡(luò)的多節(jié)點(diǎn)項(xiàng)目一起。這些網(wǎng)絡(luò)節(jié)點(diǎn)提供了氣象條件和太陽能電池陣列輸出功率的快照，為主要?dú)庀笾行牡?a target='_blank' class='arckwlink_none'>電源總線提供了信息。

　　The PIC24FJ192GA110 MCU implementation

　　The PIC24FJ192GA110 MCU was used as a weather node to return wireless readings of temperature， humidity， and Lux （luminous flux density） from each of the respective sensors. The node also monitors its own voltage through the use of a high resistance potential divider and voltage follower. These analog signals are read on a sixteen point average via the on-chip ADC. The human-machine interface uses change notification （CN） interrupts via hermetically sealed tactile pushbutton switches and an LCD screen to update the local user with current sensor data.

　　Operating on an average current draw of as little as 9.25 mA， the node was designed with low power and wireless connectivity in mind. Running at 57，600 Baud， the system uses the PIC’s UART2 port as a means of serial communication with an XBee Pro unit （XBP24-BWIT-004-ND） in pass-through mode. This allows plug-and-play connectivity as if the PIC’s UART port were physically connected on a hard line.