基于DSP的高精度相对湿度测量系统设计

Design of High Precision Relative Humidity Measurement System Based on DSP

根据干湿球法测量相对湿度的基本原理,设计了基于DSP的相对湿度测量系统。系统以DSP为核心,通过传感器电路采集温度数据,经AD转换后送给DSP处理,经修正后的干球温度、湿球温度、相对湿度在OLED显示屏上实时显示。文中给出了硬件、软件的设计方案,介绍了DSP与AD的接口电路以及叠代计算方法。该系统具有测量范围广,精度高,灵敏度高,功耗低,可靠性好等优点。

Based on the psychrometer principles, a relative humidity measurement system via DSP was developed. It acquired the temperature data through the sensor circuit and then transmitted them to the DSP processor after the AD conversation. After be- ing amended the dry-bulb temperature, wet-bulb temperature and relative humidity can be ondisplayed on the OLED real-time. The hardware and software design project was presented, and the interface circuit of DSP and AD was introduced as well as the it- erative computational method. This relative humidity measurement system has many advantages such as the wide temperature measurement range, high precision, low power consuming rate and high reliability.