Newbie Project: Arduino Ear Thermometer using Thermopile

[system]

In that case you are talking about 86400 to 172800 readings. Even at a byte each, that is far more than the available EEPROM (1 Kb).

You could scale down a bit (a reading every couple of minutes) or get some external storage. An SD card in a small adapter might do the trick, eg.

MicroSD card breakout board+ : ID 254 : Adafruit Industries, Unique & fun DIY electronics and kits

Or an EEPROM chip, eg.

Gammon Forum : Electronics : Microprocessors : Connecting 512 Kbyte EEPROM (flash memory) to your processor using SPI

Thanks Nick! Microsd sounds great! And it's not too expensive.