Adafruit Ada-1141 Shield Rtc, Data Logger I2c Kit Module, Connectors Sd,

Adafruit Pn532 Nfc/Rfid Controller Shield For Arduino + Extras [Ada789]

Adafruit Black Lcd Shield Kit W/ 16X2 Character Display - Only 2 Pins Used!

Adafruit Blue Tpl5111 Low Power Timer Breakout

Adafruit Bmp280 I2c Or Spi Barometric Pressure And Altitude Sensor