A Hall Effect Sensor is a transducer that detects and measures magnetic fields by producing a voltage proportional to the magnetic field strength. Discovered by Edwin Hall in 1879, these sensors are valued for their non-contact sensing, durability, and adaptability, leading to widespread use across various industries. They work on the principle that when a current-carrying conductor or semiconductor is exposed to a magnetic field perpendicular to the current's path, a voltage difference, known as the Hall voltage, is generated. This voltage is directly proportional to the magnetic field's intensity.
Hall Effect Sensors are available from many manufacturers, including Honeywell, Broadcom/Avago, Texas Instruments, and Allegro MicroSystems. They come in two primary types: linear (analog) sensors, which output a voltage that varies linearly with the magnetic field's strength, and switch (digital) sensors, which act like binary switches. Key features include high sensitivity, precision and accuracy, and the ability to detect both the presence and direction of a magnetic field. They are also robust and resistant to dust, dirt, and moisture, making them suitable for harsh environments. Hall effect sensors are used in proximity sensing, positioning, speed detection, and current sensing applications.
The price of Hall Effect Sensors can vary significantly based on type, features, and manufacturer. Individual sensors can range from a few dollars to several hundred dollars. For example, the ACHS-7194-000E from Broadcom/Avago is listed at $3.24, while some Honeywell models range from approximately $11.00 to over $100. Availability is generally high, with many models in stock at major electronics distributors like Mouser Electronics and DigiKey.
