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STM32F1与STM32CubeIDE编程实例-热敏传感器驱动
2022-06-26 06:41:00 【视觉智能】
热敏传感器驱动
热敏电阻是可变电阻器,其电阻随温度变化。 它们根据其电阻对温度变化的反应方式进行分类。 在负温度系数 (NTC) 热敏电阻中,电阻随着温度的升高而降低。 在正温度系数 (PTC) 热敏电阻中,电阻随着温度的升高而增加。
导电材料包含允许电流流过的电荷载流子。 高温导致半导体材料释放更多的电荷载流子。 在由氧化铁制成的 NTC 热敏电阻中,电子是电荷载体。 在氧化镍 NTC 热敏电阻中,电荷载流子是电子空穴。

由于热敏电阻是可变电阻器,因此我们需要先测量电阻,然后才能计算温度。 但是,STM32 不能直接测量电阻,它只能测量电压。
STM32将测量热敏电阻和已知电阻之间某个点的电压。 这被称为分压器。 分压器的公式为:

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