TDC mining
The pulse laser rangefinder calculates the distance by measuring the time between laser emission and return
of course, the application of smart phone ranging can't compare with professional instruments in accuracy, but it's also enough when it only needs to estimate the approximate distance. They use the trigonometry principle to calculate the approximate distance between the user and a visible object. What the user needs to do is to input the position and height of the smartphone and aim the crosshairs at the bottom of the object
Therefore, time measurement is a very important link for pulsed laser rangefinder. Because the speed of laser is very fast, the time interval between the transmitted and received laser pulses is very small. For example, to measure a distance of 1km, the resolution of 1cm is required, and the resolution of time interval measurement is required to be as high as 67ps{rrrrrrr}
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smart phones can also achieve the following 10 "exotic" functions:
1, infrared detection
we can't see infrared with naked eyes, but the camera of smart phones can detect it - pick up the infrared remote control of TV, air conditioner and other household appliances to try: turn on the camera application of mobile phones, Then point the infrared tube of the remote control at the camera. When you press the key, you will see it emit white or purple light in the viewfinder. You can use this trick to check whether the battery of the remote control has power
2. Read passport information through NFC
many countries now issue passports with built-in RFID (radio frequency identification) chips to store the holder's photo, fingerprint scanning image and other information, and mobile phones with NFC (near field communication) function can scan these information with the help of special applications. Of course, not all passports support this function
3. Use Bluetooth headset as remote control shutter
Bluetooth mobile phone can be used as remote control shutter of smart phone, but not all Bluetooth headsets can do so, and you have to find out which key and which combination of keys to use (for example, press the volume up key twice, press the call key three times, and so on)
4. Mining bitcoin
smart phones can also mine bitcoin compared with other cryptocurrencies. Of course, this can't make you rich overnight - even if you mine with high-end smart phones, you may not make a few cents a day, and it will greatly increase the load of the mobile phone, even lead to serious fever, which is often not worth the loss in the end. But it's cool to know that smartphones can mine