Yo Dawg, I heard you like TeensyROM so I made a little TeensyROM to connect to your TeensyROM!

TappyROM is a complete NFC tag reader (tap) device in the form of a miniature TeensyROM cartridge--less than 5cm square! It can be used to easily program NFC "tags" which can then be used to launch a program by touching the tag to the device. It has been tested with the TeensyROM though is also likely usable with other devices/software.

Five NFC cards are included which work with the TeensyROM's NFC loading capability. If you're shopping for more tags, NTAG215 cards/tokens/stickers are widely available and recommended.

You will need a USB A to C data cable (not included) for use with the TeensyROM. (Please ensure that the cable supports data transfer and not just charging.)

Technical Information

The compact enclosure houses a PN532 type NFC reader module coupled with a CH340N USB interface, details which may be relevant if you're selecting NFC tags or want to interface with other devices.

If you have trouble writing a card, try holding it at an upward angle above or next to the device. (Reading tends to be extremely easy, but writing can be a bit particular about placement and interference.)

Additional

If you want to see how deep the rabbit hole goes, you can also use mini-TeensyROMs as NFC tags!