If the Arduino loses sight of the DHT22 temperature sensor inside the freezer, then the alarm sounds continuously. And if [Adam] is ever curious about the temperature in the freezer, it’s right ...

Plus, a built-in alarm that sounds when there’s a temperature change or an open door adds a little extra security that balances things out. Despite the overwhelming pros of this austere freezer ...

Labs that share the ULT freezers must provide at least two people to contact in case a shared freezer’s alarm goes off. The contact people must be available 24/7 to respond to critical temperature ...