What is a car speedometer?

[GeorgeFitz]

Car speedometer is an application used to view the driving speed, supporting both miles per hour or kilometers per hour units. The speedometer function requires strong GPS signal support, and can display speeds up to 220 kilometers per hour. Many car dashboards now use electronic speedometers, with a common type obtaining signals from the speed sensor on the transmission, causing the pointer to deflect or display numbers through changes in pulse frequency. Here is more related information: Traditional speedometer: The traditional speedometer is a typical mechanical odometer connected to a flexible shaft containing a steel cable. The other end of the flexible shaft is connected to a gear on the transmission. The rotation of the gear drives the steel cable to rotate, which in turn drives a magnet inside the odometer housing to rotate. The housing is connected to the pointer and positions the pointer at zero through a hairspring. The speed of the magnet's rotation causes changes in the size of the magnetic field lines, disrupting the balance and thus moving the pointer. This type of speedometer is simple and practical, widely used in vehicles of all sizes. However, with the development of electronic technology.