如何转换从温度传感器得到的值? [英] How to convert the value get from Temperature Sensor?

问题描述

我在ST Temperature sensor( hts221 )上工作，我与传感器使用I2C命令通信.

I am working on ST Temperature sensor( hts221 ) , I use I2C command communication with sensor.

我从文档中看到如下文本.

I see from the document like the following text.

enter code here Temperature data are expressed as TEMP_OUT_H & TEMP_OUT_L as 2’s complement numbers.

enter code here Temperature data are expressed as TEMP_OUT_H & TEMP_OUT_L as 2’s complement numbers.

下面的图片是来自文档的描述.

And the following picture is the description from document.

从传感器读取的Temperature data如下所示

And the Temperature data read from the sensor is like the following

TEMP_OUT_L is 0xA8
TEMP_OUT_H is 0xFF

如何将TEMP_OUT_L和TEMP_OUT_H的值转换为温度数据?

提前谢谢吗?

推荐答案

在这就是您需要做的:

#define TEMP_SENSITIVITY 0.016f
#define TEMP_OFFSET      ???    /* Get this value from the datasheet. */

unsigned char tempOutH;
unsigned char tempOutL;

/* Here you get the values for tempOutH and tempOutL. */

uint16_t tempData = (tempOutH << 8) | tempOutL;
float    temp     = (tempData * TEMP_SENSITIVITY) + TEMP_OFFSET;  

因此，您要做的是将两个8位的高值和低值连接在一起.这为您提供了一个16位值.然后，您可以将0到65535之间的数字转换/缩放为实际温度值.

So what you do is concatenate the two 8-bit high and low values. This gives you a single 16-bit value. Then you convert/scale that number between 0 and 65535 to the real temperature value.

我假设必须在数据表中指定一个偏移量，因为否则温度只能为正值:在0.0和65363 * 0.016之间.该偏移量将为负值.我让你找这个偏移量.

I assumed that there must be an offset specified in the datasheet, because otherwise the temperature can only positive: between 0.0 and 65363 * 0.016. This offset will be a negative value. I leave it up to you to find this offset.

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