Aiming at solving the problems of single function, short battery life and no use in network for old thermohygrometer, a new thermohygrometer with control function based on MSP430F149 singlechip was presented. The sensor interface circuits, power circuit and RS232/RS485 communication circuit on the board were designed newly compared with other similar instruments, and so the problems on these circuits were solved in the new instrument. In addition, some extended functions were provided, like the circuit for receiving and converting 4mA ～ 20 mA current, real -time clock circuit, single relay control board and so on. The program was discussed in the end, it consisted of main program design, interrupt programs design, program design for RS232/RS485 communication and other subfunctions design. The resuits indicate that the device has basic measurement function and control function through independent testing and networked testing, and other functions can be expanded by users, it is convenient in use and stable in performance.%针对市场上已有温、湿度仪功能单一,电池使用时间短以及不能组网使用等问题,提出了一种基于MSP430F149单片机设计的温、湿度测控仪,重新设计了板上传感器接口电路、电源电路以及RS232/RS485通信电路,克服了原有仪器在这上面的一些缺点,此外该仪器还提供了4 mA～20mA电流接收转换电路、实时时钟电路以及继电器控制单板等扩展功能.最后讨论了主程序设计中断程序设计和RS232/RS485通信程序设计以及其他子程序设计.研究结果表明,该仪器完成了基本的温湿度测量控制功能,并且可以扩展其他功能,使用方便,性能可靠.
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