EAEP-Electrical and Electronics Portal

Typical view of Speed sensor   What is speed sensor? The speed sensor belongs to the tachometer category. It is a device used to measure the speed of wheel rotation of a vehicle. The speed sensor was initially used to replace the mechanical connection between the rotating wheels and the speedometer, reducing the use of cables and facilitating construction by reducing rotating parts. These sensors also generate data that allows automatic driving to take place. The speed of an object is the magnitude of the change of its position; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed has the dimensions of distance divided by time. The SI unit of speed is the meter per second, but the most common unit of speed in everyday usage is the kilometer per hour.

Reed switch What is a reed switch? Magnetic reed switch an electrical switch driven by a magnet. It consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. There are two types of configuration: Normally open (NO), closes when a magnetic field is brought near and normally close (NC) open when a magnetic field is brought near. When the magnetic field is removed, the contacts in the reed switch return to their original position. It was invented at Bell Telephone Laboratories in 1936 by Walter B. Ellwood. How a Reed Switch Work? The switching mechanism of the reed switch consists of two ferromagnetic blades which are separated by a small gap. These ferromagnetic blades are lightweight, magnetic and flexible. When a magnet is brought close to these blades, the two blades pull towards each other. Once the blades are closed the normally open (NO) contacts that allow electricity to flow. Some reed switches do not have a ferromagnetic contact, such s