The principle of pedometer is that the sensor is driven by mechanical motion, and the electronic circuit completes the follow-up work after counting, such as counting, storing, calculating and displaying. The principle of the sensor is generally to use a small weight that can be moved at will.

Using the physical inertia when the device moves, the mutual motion between the device and the weight is generated, and then the motion is detected by the sensing element. The sensor can use a mechanical switch (opening or closing two pieces of metal), or a photoelectric switch, or attach a magnet to a heavy object and detect it with a Hall element.

Generally speaking, pedometer is nothing more than three buttons: reset, mode and setting. Different manufacturers have different names, but they are all the same. Some manufacturers have added backlight buttons and MP3 buttons to pedometers. But the basic buttons are nothing more than these three kinds.

Usually, the mode key is used to switch between viewing data, and the setting key, as its name implies, is to adjust the setting data. When the pedometer sets data, the adjustable data will flash. At this time, according to the key settings of the manufacturer, the way of adjusting data is different, and the setting operation is also different.

At present, the mainstream in the market is to use 3D electronic pedometer. 3D is to feel the vibration of the human body in all directions, that is, you don't need to wear it vertically on the ground, just put it in your pocket and put it in your handbag to count the steps. Using more advanced electronic sensors, the step counting is more accurate and smaller. Some advanced 3D pedometers also have the functions of stopwatch, radio, MP3, flashlight and ultraviolet ray.

Reference pedometer _ Baidu Encyclopedia