Hall Effect Sensor Calculator

Calculated Output:

What is a Hall Effect Sensor?

A Hall Effect sensor is a transducer that varies its output voltage in response to a magnetic field. Named after Edwin Hall, who discovered the phenomenon in 1879, these sensors are used for proximity switching, positioning, speed detection, and current sensing applications. Unlike mechanical switches, Hall Effect sensors are solid-state, meaning they have no moving parts and offer significantly longer operational lifespans.

How to Use the Hall Effect Calculator

This calculator helps you predict the output voltage of a linear Hall Effect sensor based on its technical specifications. To use the tool, follow these steps:

  • Quiescent Voltage (Vq): Enter the voltage output of the sensor when no magnetic field is present (typically Vcc/2).
  • Sensitivity: Enter the millivolts per Gauss (mV/G) rating found in the sensor's datasheet.
  • Magnetic Flux Density: Enter the strength of the magnetic field in Gauss (G). Positive values represent a South pole, while negative values represent a North pole.

Understanding the Formula

The output voltage (Vout) of a linear Hall Effect sensor is determined by the following formula:

Vout = Vq + (Sensitivity × B)

Where "B" is the magnetic flux density. Note that sensitivity is usually provided in mV/G, so it must be converted to Volts (divide by 1000) if you want the final result in Volts.

Frequently Asked Questions

What is the difference between Gauss and Tesla?

Gauss (G) and Tesla (T) are both units of magnetic flux density. 1 Tesla is equal to 10,000 Gauss. Most small-scale Hall Effect sensors use Gauss for sensitivity ratings.

Why is my output voltage not changing?

If the voltage remains at the quiescent level, the magnetic field may be too weak, the sensor may be a "switch" type rather than a "linear" type, or the magnet might be oriented incorrectly. Linear sensors provide a proportional output, while digital Hall switches only trigger at specific thresholds.

What are common applications?

Hall Effect sensors are ubiquitous in modern electronics. They are found in automotive ignition systems, brushless DC motors (BLDC) for timing, smartphone flip-covers, and anti-lock braking systems (ABS) to measure wheel speed.