【自制】如何把门禁卡做成你用不起的样子？硬核UP自制带屏幕的NFC名片
这是UP制作的一个超迷你智能NFC卡片，带电子墨水屏，可以模拟各种IC卡，和配套APP使用设置显示内容等等功能，超爱用！
项目开源，喜欢的同学麻烦长按点赞三连加关注支持一下啦
开源地址（整理中）：https://github.com/peng-zhihui/L-ink_Card
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Video Transcript
Hi, everyone. I'm Weijun.
This may be the longest video I've ever made.
I announced the preview of this project about two months ago.
I've been working on it for a week.
I've finished the project.
So what kind of project is this?
OK, let me tell you about my pain points.
You must be familiar with IC cards.
The company's official brand, the school's meal card, the community's door sign, etc.
These are all IC cards.
And I'm a person who doesn't like to wear cards.
I think it's very impolite to wear a bunch of cards in my pocket.
So when I was in school,
I tried to transform the fan card into a new phone
Of course, this method will still have a lot of restrictions.
I will explain this later.
In short, I actually wanted to design a smart card myself a long time ago.
These are the functions that can be added.
First of all, the most basic must solve the pain point above.
That is, the information that can store the card.
Second, of course, I don't want the card to be written only once.
But it can be written at any time according to my needs.
Then, based on the same frequency of the IC card and NFC,
I hope it can be equipped with a NFC label function.
As for the use of the NFC label,
many scenes of automated starting can be imagined.
Fourth, there is a screen where there is a smart band.
In this scenario, the electronic ink level of the power supply is clearly the best choice.
Fifth, you must have a backup app.
This part involves various image processing, which is also the most interesting part.
You can see it later.
The last and most important point, the iron rate of the steel box must be mini enough.
OK, based on the above requirements, I started to do things.
First is the selection of the solution.
I chose an NFC communication chip of ST, ST25DB.
This can be considered an NFC physical layer chip.
We can configure and read data through the FNC main line.
Of course, there are many NFC smart label chips.
The reason for choosing this one is that it supports energy harvesting.
Everyone knows that there is no battery in all kinds of IC cards.
When the card reader communicates with these cards,
where does the power of the chip in the card come from?
In fact, it is very simple.
It is the energy obtained from the electromagnetic wave emitted by the card reader.
So the energy collection function of this ST25DV
is that it can be obtained through the coil
and transmitted to the MCU or other chips.
But don't be too happy.
This energy is very weak.
Power is probably only enough to light an LED.
