Wiegand sensors Wiegand sensors are
magnetic sensors that make use of the Wiegand effect to generate a consistent pulse every time
magnetic field polarity reverses and therefore do not rely on any external voltage or current. The consistency of the pulses produced by Wiegand sensors can be used to provide energy for
low-power and energy-saving applications. Being self-powered, Wiegand sensors have a potential in IoT applications as energy harvesters, proximity sensors, and event counters.
Wiegand keycards John R. Wiegand and Milton Velinsky developed an
access control card using Wiegand wires. Besides sensors, the Wiegand effect is used for security
keycard door locks. The
Wiegand interface, originally developed for Wiegand-wire cards, is still the de-facto standard convention for transmitting data from any kind of access card to an access control panel.
Rotary encoder Wiegand wires are used by some
rotary magnetic encoders to power the multi-turn circuitry. As the encoder revolves, the Wiegand wire core coil generates a pulse of electricity sufficient to power the encoder and write the turns count to non-volatile memory. This works at any speed of rotation and eliminates the clock/gear mechanism typically associated with multi-turn encoders.
Wheel speed sensor Wiegand wires are fitted to the outer diameter of a wheel to measure rotational speeds. An externally mounted reading head detects the Wiegand pulses. == References ==