Limetree is a shitty Arduino-style project / Bluetooth bridge that allows people to scan an RFID badge and have the UID of the badge transmitted over Bluetooth to an iOS device.
Limetree is using these components:
Adafruit Feather nRF52 Bluefruit LE - nRF52832 Small sweet BLE board with everything on one chip which makes it less of a hassle not having to use AT commands etc.
Adafruit PN532 NFC/RFID controller breakout board I used the V1.6 version configured in SPI mode.
NeoPixel FeatherWing - 4x8 RGB LED Slapped this on the Featherboard for some visual feedback of badge scan.
Connections between the boards is as following:
I'm adding the Sketchup Model and .dae file for a 3D printable case for this device on which you can slap a frosted piece of plexi on top (fits without screws) and have a nice box for this project.