The parts counter.
Every part the store's solutions are built from. Each page tells you what the part is, how to pick a good one, and where to get it. OAT sells nothing; the search term is the know-how.
Microcontroller
An ESP32 board
The little computer that runs OAT firmware. It listens, reads, and pushes data to a place you own, all day, on a few dollars of electricity a year.
Sensor
Govee Bluetooth thermometer
A cheap, honest thermometer and hygrometer that broadcasts every reading over Bluetooth. OAT firmware hears the broadcast directly: no app, no cloud account, no hub.
Sensor
SHT-30 weatherproof probe
A research-grade temperature and humidity sensor in a weatherproof mesh tube on a 1 meter cable. Wires straight to an ESP32: four wires.
Sensor
DS18B20 waterproof probe
The classic stainless-steel waterproof temperature probe on a cable. Temperature only, a few dollars, and it can sit in a brine tank or a glycol bath all year.
Enclosure
IP65 sealed project box
A sealed plastic box that keeps a board dry in a washdown room, a barn, or outdoors. Roughly 100 x 68 x 50 mm fits any board in this store with room for the cable.
You already own this one.
Power
USB power supply and data cable
A phone charger and a USB cable power every board in this store. You very likely own both already.