Always-on, contact-less stove top temperature monitor with LED illumination

Hi All,

First project and first time posting, so my thanks in advance for any advice you might share.

The Problem:
My wife keeps burning/melting things after our electric range is turned off but one or more "burners" are still very hot. The stove has a small indicator light that turns on if any part of the glass stove top is above a specific temp (unknown), but that hasn't saved the lives of my oven mitts and plastic containers.

The Fix:
An Arduino-based solution that constantly monitors the temperature of the whole stove surface. If the temperature goes above a set point, a red LED (likely an array of them) slowly pulses to illuminate the entire surface (see attachments). This device will, by my estimation, require an infrared temperature sensor, an array of red LEDs, a power source, an Arduino, and perhaps a shield (literal) of some kind. I aim to mount it in the hood directly above the stove (~2.5 feet above the stove surface).

Request for advice on design, parts, and/or feasibility:
In order for this to operate properly, I want to ensure that the temperature sensor can monitor an area ~2 ft. x 2 ft. Further, the LED illumination (if on) will also need to be bright enough to compete with existing kitchen lighting. This leads me to the following questions:

-Is there a more efficient way to go about doing this? If not, then:
-What Arduino is best suited for this kind of setup?
-Any recommendations on a cost-effective infrared temp sensor?
-Approximately how many LEDs would I need to generate effective lighting?

Again, my sincere thanks for your help on this! I have access to some great prototyping resources through work, so tools shouldn't be an issue. I'll provide updates to those who are interested if I can pull it off!

Mounting location for arduino.JPG

I'd use one sensor per burner. I think you'll find that easier, cheaper, and more reliable in the end.

Stove already has all the parts in place, just use the indicator light that currently lights up to control whatever larger display you want.
No Arduino necessary, no wasting effort on a pointlessly redundant venture.
Your problem is basically, 'I want that indicator light to shine a different light', so, do that.

1 Like

Thanks to everyone for the input on this. Went through quite a few iterations, but finally ended up with something that made sense.

@INTP: I measured the surface temperature of the burners when the oven's built-in indicator light would turn off. Interestingly, some measured 130 F or higher. Hence the need for an external monitor. I had originally considered what you had suggested but, in the end, wanted a lower threshold for the temperature.

@pert: Ended up using a TMP006 sensor that could monitor the whole cooking area. Couldn't restrict the sensors well enough to single burners, unfortunately.

Final product ended up being an ATMega328P taking input from a TMP006 and outputting to a neopixel 16-LED ring. The LED ring pattern becomes activated if the temperature difference between the sensor itself and the measured area temperature is greater than 2 degrees Celsius.