DS1921 Thermochron iButton

The DS1921 Thermochron is an iButton sensor designed to measure temperature. The 16mm diameter DS1921, has an embedded architecture with a temperature sensor (measuring over a range of -40 C to +85 C in 0.5 C increments), a clock/calendar, onboard memory to log temperature measurements, as well as 512 additional Bytes of memory, and a 1-wire transmitter/receiver.

The DS1921 Thermochron logs 2048 temperature samples, each with an individual time and date stamp. The sampling interval can be set between 1 and 255 minutes.