There’s an Arduino with a custom shield that interfaces the barometric pressure sensor, real-time clock chip, a digital temperature sensor, and a humidity sensor.

The Arduino compatible Pax Instruments T400 Temperature Datalogger is now available to purchase priced at $175 from Adafruit.

Keeping track of things like the temperature, humidity, and smoke level in your house is important. If you want to make your own system for doing so, ...