Adafruit 2922 Adalogger FeatherWing - RTC + SD Add-on For All Feat...

Adafruit FeatherWing Add-ons For All Feather Boards - Adafruit 2922, The Adafruit Adalogger FeatherWing Add-ons combine a real-time clock (RTC), a battery backup and an SD card interface so that you can get on with some time stamping data-logging. They are compatible with all the Feather main boards and are controlled via I2C with an SPI channel to the SD card. Adafruit supply a library for the real time clock which you are free to download and the default Arduino SD library will handle the SD card. Supplied as a fully assembled and tested board plus strips of 0.1in. header pins for you to solder on as required. Adafruit 2922 Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards

Price: £ 11.26 from Rapid Online Rapid Electronics Ltd.