Description

Start the board in configuration mode to allow changing ssid and password outside of re-flashing.

Main features

• Start wifi in AP mode
• Display AP info on LCD screen
• Accept ssid and password through small web page hosted on board
• Store ssid and password in FRAM chip
• Read ssid and password from FRAM chip on boot

Description

Go into some sort of low power mode when external power is lost and we are running off of battery.

Description

Monitor if external power is present. Board should be powered by same circuit as fridge so we can detect if there is power loss. Backup battery will supply temporary power to board until exhausted so we can alert.

Features

• Use voltage divider to lower 5v USB input power to 3.3v range.
• Connect output of voltage divider to pin A3.
• Read value of A3 and convert to voltage.
• Store configuration option for minimum voltage of external power
• If external power drops below minimum, set alarm boolean to true.

Description

Add some type of buzzer.

Features

• Generate tone periodically when alarm boolean is set to true

Description

Add the ability to monitor if doors are open.

Features

• Monitor two microswitches (poll or interrupt?). One for freezer door and one for fridge door.
• When either door is opened, start a timer.
• When timer expires set alarm boolean to true.
• Report door status for data uploads and LCD.

Description

Add LCD screen support to allow local display of vital info using a 20x4 character display.

Features

• Display values for all temperature sensors
• Display door status
• Display wifi info
• Might need multiple pages
• Button press changes pages
• Timer to default back to 'main' page

Description

Add support for a I2C FRAM chip to store configuration info.

Most likely will use this Adafruit breakout board: https://www.adafruit.com/product/1895