Hotel fun 1

I went on a business trip the other day and stayed in a hotel. An interesting thing happened. Maybe it's because I just started my business. The front desk gave me two cards, one is to open the door and the other is to take out the power switch card. Usually, a card is enough. It's strange to want two cards now. Later, I checked the information and found that there are many kinds of cards for hotel locks and power switches. I think it is amazing and I will share it with you.

Common cards are IC card and ID card. IC card is M 1 card, also called high frequency card 13.56 MHz. It has 16 sectors, and each sector has 4 blocks, which can store data. The ID number we usually say is stored in this one, and the recharge amount of the bus card is also stored in it. I heard this can be encrypted. It is said that bank cards can be encrypted.

The ID card is an electronic tag, and only the ID number can be read, but no data can be stored. It's a low-frequency card with a card reading frequency of 125Khz. Some locks use this card.

The power switch and door lock of the hotel are not a card type, and you need two cards to check in. This is really a great hotel.

Later, I studied the power switch. There are many interesting things in it. There are several ways to detect them. Most of them use IC cards to read sector data, some use ID cards to read card numbers, and some use photoelectric switches to read nothing. Just put something in, and you can electrify the room. You can try it next time. When you stay in a hotel, just find a card and try to see if you can get electricity.

Share these today, and I'll share them with you next time I meet something interesting [yeah] [yeah] [yeah]