基于USB接口的智能温湿度测记仪

Research on Intelligent Temperature and Humidity Memory Instrument based on USB Interface

该仪器选用温湿度一体数字量输出传感器SHT11对环境温湿度进行随时、定时、实时地检测,通过点阵图形式液晶显示模块HGO12864同屏显示温湿度值、露点值以及日期和时间,温湿度值以及相对应的时间被保存在非易失性铁电存储器FM31256中,确保仪器掉电后数据不丢失。通过双模式USB接口将实时数据或存储数据上传给PC机,利用自编的应用软件绘制温湿度历史变化曲线或实时曲线,计算任意测试时间段的温湿度最大值、最小值、平均值、方差;还可进一步对数据进行统计分析,报表输出,同时可对仪器的基本采集参数进行设置。该仪器采用可充电锂电供电,功耗低、精度高、即插即用、通用性强。

The instrument uses a single chip relative humidity and temperature multi sensor -SHT11 module comprising a calibrated digital output, which can measure temperature, and relative humidity of environment at any moment, timely and real time. It displays temperature-humidity value, dew point value, date and time at the same time by lattice graphics LCM （Liquid Crystal Display Module） HGO12864. Temperature-humidity value and relevant time are saved in nonvolatile FRAM （Ferroelectric Random Access Memory） FM31256, which can assure data does not lose after power of system fail. Real-time data or data in FM31256 can be upload PC by double mode USB interface, and then is protracted temperature-humidity history curve or real-time curve by internet applications programmed on one＇s own. It can not only calculate maximum, minimum, average and variance among random measuring period of time but also make further Statistics and analysis, report forms printing, and setup basic measure parameters of instrument. It＇s power supply is chargeable Li-battery. It is low power-consuming, high precision, plug and play and better universal performance.