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一、PHTH-1型温度/湿度表的原理 PHTH-1型温度/湿度表是以单片机技术为基础自行开发设计的。它的结构原理简图如图1所示。 该温度/湿度表的湿度测量部分采用的是美国Honeywell公司的电容式传感器,它自带信号处理电路、体积小、性能稳定。测量湿度及温度时的工作过程简述如下: 给电容式湿度传感器加一个恒定的电压,它将相对湿度变换成一定的输出电压。该电压通过放大器放大到适当的幅度,然后进行A/D转换,转换的结果送到单片机中,单片机根据存储在EEPROM中的标定数据进行数据处理
First, PHTH-1-type temperature / humidity meter principle PHTH-1-type temperature / humidity meter is based on single-chip technology to develop their own design. Its structural principle diagram is shown in Figure 1. Humidity measurement part of the temperature / humidity meter is used in the United States Honeywell capacitive sensor, which comes with signal processing circuit, small size, stable performance. The working process of measuring humidity and temperature is briefly described as follows: A constant voltage is applied to the capacitive humidity sensor, which converts the relative humidity into a certain output voltage. The voltage amplified by the amplifier to the appropriate range, and then A / D conversion, the conversion results sent to the microcontroller, the microcontroller stored in the EEPROM according to the calibration data for data processing