【Cyber ​​Valley】Turned a friend's self-designed card into a glowing 2-in-1 NFC card.

Video Link: None available yet, will make it later. The project description
on my Bilibili account homepage is a very simple 2-in-1 NFC card. The material cost is less than 5 yuan (PCB used a free color silkscreen coupon, LED + resistor + switch cost less than 50 cents, NFC chip costs at most 2 yuan). The images are not open-source authorized, so the original color silkscreen images are not included in the project. You can paste your own image, modify the board outline and via positions, and it will work. My via positions are unusual because I need to use them to some extent to hide the vias in conjunction with the images. Project Functionality: Two COBs. This device consists of an NFC chip, two LEDs, and a slider switch. The slider switch allows you to switch between the NFC chips used, and the LED color indicates which chip is currently in use. The actual brightness isn't as high as shown in the picture, but it still looks quite nice. Important notes: NFC cards, such as access cards, typically use UID chips. NTAG chips cannot be copied. For writing access card data, please use UID or CUID chips. NTAG is only recommended for writing data such as Wi-Fi and Bluetooth. The pads support two NFC chip sizes: NTAG chips are typically 3x5mm (solder side up during soldering); UID chips are typically 5x8mm (solder side down during soldering). It's recommended to use a heated soldering station after soldering. The slider switch is reverse-soldered into a slot on the PCB, roughly flush with the PCB. The LEDs are reverse-soldered so that light shines through to the front. It's recommended to apply black tape to the back of the LEDs to prevent light leakage and enhance the brightness of the front. The current direction for both LEDs must be the same during soldering; otherwise, both LEDs may light up simultaneously when the card is swiped (creating the circuit shown in the picture). If you don't want to solder these yourself, I might solder a few more to sell later (Bilibili Workshop).