霍尔效应传感器也称霍尔传感器，是一个换能器，将变化的磁场转化为输出电压的变化。霍尔传感器首先是用来测磁场的，此外还可以被用来测量产生和影响磁场的物理量，例如，被用于接近开关，霍尔乘法器，位置测量，转速测量，和电流测量设备。

其最简单的形式是，传感器作为一个模拟换能器，直接返回一个电压。

在已知磁场下，其距霍尔盘的距离是可以被设定的。使用多组传感器，磁铁的相关位置可被推断出。

通过导体的电流会产生一个随电流变化的磁场，并且霍尔效应传感器可以在不干扰电流情况下而测量电流。典型的为，将其和绕组磁芯或在被测导体旁的永磁体合成一体。

A Hall effect sensor is a transducer that varies its output voltage in response to a magnetic field. Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications.

In its simplest form, the sensor operates as an analog transducer, directly returning a voltage. With a known magnetic field, its distance from the Hall plate can be determined. Using groups of sensors, the relative position of the magnet can be deduced.