Accidentally leaving a door open for a long time will ruin the contents of a freezer if nobody knows about it. This alarm will notify folks when the door has been left open for more than 10 minutes, and it will start beeping after 5 minutes. A motion sensor will restart the door timers when activated, as someone could spend >5 minutes loading the freezer. This alarm is designed to fit a double door commercial freezer.

There are 3 phases of the alarm

  1. Door(s) open <5 minutes - no action.
  2. Door(s) open >5 minutes with no motion - pre-alarm beeping.
  3. Door(s) open >10 minutes with no motion - beep more and email a notification.

The purpose of the pre-alarm beeping is to draw attention to the freezer so someone can close it before the alarm goes off.

Parts

ESP32-S3 Feather with 4MB Flash 2MB PSRAM
The ESP32-S3 has arrived in Feather format - and what a great way to get started with this powerful new chip from Espressif! With dual 240 MHz cores, WiFi and BLE support, and native...
Out of Stock
Prototyping feather wing PCB with loose headers
A Feather board without ambition is a Feather board without FeatherWings!This is the FeatherWing Proto - a prototyping add-on for all Feather boards. Using our...
$4.95
In Stock
Topdown video of 3-pin PIR sensor assembled onto a breadboard. A hand passes over the sensor, and a blue LED to light up.
PIR sensors are used to detect motion from pets/humanoids from about 5 meters away (possibly works on zombies, not guaranteed). This sensor is much smaller than most PIR modules, which...
$3.95
In Stock
5V 2A Switching Power Supply with  USB-A Connector
Our 5V 2A USB power adapter is the perfect choice for powering single-board computers like Raspberry Pi, BeagleBone, or anything else that's power-hungry!This adapter was...
$7.95
In Stock
2 x Buzzer
5v breadboard friendly
2 x Magnetic contact switch
Door sensor, with mounting screws
1 x Header Kit for Feather
12-pin and 16-pin Female Header Set
1 x Hook-up Wire Spool Set
22AWG Solid Core - 6 x 25 ft
1 x 1 Ft Jumper Wires
Jumper wires
1 x Mounting Tape
Gorilla Glue Heavy Duty Mounting Tape
1 x USB-C cable
15ft

Tools

Soldering Iron
Wire Stripper/Cutter
Breadboard
3D Printer
Ladder

This guide was first published on Oct 12, 2022. It was last updated on Oct 12, 2022.

This page (Overview) was last updated on Apr 28, 2022.

Text editor powered by tinymce.