Grilled Cheese Smart Box Microcontroller And A Whole Lot More

The Smart Box uses a microcontroller (mcu), and a whole lot more, to keep fresh grilled cheese sandwiches hot, moist and crisp.

Fresh, tasty, warm grilled cheese sandwich

The Smart Box is an innovation that dramatically demonstrates two sometimes overlooked non-electronics aspects of MCU-focused projects that can require as much work as the electronics, if not more work. Those two non-electronics issues are:

1. Figuring out what you need the MCU to control.
2. Figuring out all the non-electronic hardware issues for the project.

The goal of the Smart Box designers was to create an environment that could extend the highly edible lifetime of a fresh grilled cheese from seven minutes to at least thirty minutes. As Fast Magazine tells the story, the design team tried to find,

"...a way to extend the sandwichs woefully short shelf life. They discovered that each Melt had about seven minutes before going cold, leaving the cheese to congeal and making for a subpar grilled cheese-eating experience...the team looked far and wide for a food transport box that could maintain just the right temperature while striking the right balance between moisture and crispiness for 30 to 60 minutes at a time...what we realized is that if you maintained the temperature, and you had even airflow, and a way to get some of the moisture out of the product as it sat in the box, that it can hold a Melt for over 20 minutes and still meet temperature, moisture, and crispness guidelines."

Sandwich container with ridges and holes for hot air circulation

The first part of the MCU project had nothing to do with an MCU. Most products and design projects involving an MCU will start by figuring out how the product or project ought to work to achieve the projects goal. For the Smart Box, the goal was a good tasting sandwich. So the first part of that project was to determine what ambient conditions would keep the sandwich from getting cold and soggy. It was obvious the grilled cheese sandwich storage and transport unit would need heat. They would have to keep the temperature low enough so it didnt cook the sandwich more, but high enough so the cheese would be nice and soft. And the temperature would need to be uniform throughout the sandwich storage and transport unit. After experimenting with different conditions, and probably eating quite a few grilled cheese sandwiches, they found the right temperature (190 - 200 degrees F) and the right moisture to keep the sandwich tasting good.

The next step was to develop a combination of materials, shapes, heaters, fans, etc, that would maintain the necessary temperature and moisture for the sandwiches. Air flow was key, both throughout the large insulated food transport box and throughout the smaller sandwich containers that sit on the shelves inside the food transport box. The majority of this physical design and development work didnt focus much on electronics of the project, other than to keep the fan pushing air and to keep the heater warming up the air. The Fast Company article explained:

"...for any of this to work, the air had to circulate around the sandwich so that the heat surrounding it was constant, like a convection oven with size restraints...Heres how it works: It uses a hot plate made out of aluminum to keep everything warm. But since direct heat can burn its contents, its covered with a shield while an internal fan ensures proper air circulation. The whole system is sensitive, so inside are sensors that monitor the environment for precise heat and humidity levels. A microcontroller is used to make small adjustments automatically, ensuring that the grilled cheese arrives at your door or desk nice and toasty."

Once the physical design of the box was mostly figured out, the electronics wizards started working their magic. They figured out what temperature sensors to use and where to put them. The fan power and controls were designed and the rest of the MCU functions were programmed.

Im sure figuring out the sensors, controls, MCU and programming took much longer than the length of the above paragraph indicates. But for the grilled cheese Smart Box, theres little doubt in my mind that the design-build issues requiring non-electronics maker skills or physical design knowledge took more time and brainpower than the MCU-related part of the project. The Smart Box illustrates why the Humboldt makers who really enjoy MCUs also need lots of other types of knowledge or need to collaborate with others who have the non-electronics skills.

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Humboldt MCU Opportunity Tech Companies Recruiting IoT Developers

One of my goals for this blog is to identify ways for Humboldt microcontroller (MCU) users to earn money and to try to highlight those money-making opportunities for people who are interested in them. It will help Humboldt people and the regional economy if we can increase the number of Humboldt MCU-related paid projects and jobs.

IoT concept graphic (from comsoc.org)

Wired.com had a short July 25 article, "Tech Giants Begin Recruiting for the Next Big Platform Wars", which talked about a technology-economy trend that Humboldt MCU people should be aware of and should look at as an opportunity for projects or jobs. The article says that the Internet of Things (IoT) is going to be a huge revenue opportunity for MCU developers, the next big platform. The killer app for the IoT hasnt come over the horizon yet, and there is no clear leader among companies competing to cash in on the billions of dollars expected to be spent on embedded computing systems and other IoT products and services. Even though no company has a firmly established lead, those organizations who want to have a chance in this race are hiring technical people, including MCU developers, to create and improve their organizations products. As Wired puts it:

Microcontroller (from ti.com)

"The Internet of Things is still young, but it’s real. There are already dozens of internet-connected devices available, ranging from home-automation tools to wearable fitness trackers. And it’s about to start growing at an even faster pace. According a new survey...17 percent of the world’s software developers are already working on Internet of Things projects. Another 23 percent are planning to start an IoT project within the next six months. The most popular devices? Security and surveillance products, connected cars, environmental sensors and smart lights and other office automation tools. The world’s largest tech companies are already in fierce competition to attract developers to their respective connected device platforms. After all, the winners of these new platform wars will define the future of computing."

Two previous technology-economy trend platforms early stages that employed a lot of developers were when businesses started having websites on the Internet and when the iPhone catalyzed a huge market for smartphone apps. New sustainable trends have a tipping point where the trend actually becomes an important economic factor and creates a significant amount of ongoing sales and reliable employment. The IoT appears to be approaching that tipping point, and the Wired article is saying the trend is sustainable and there will be a large number of steady employment opportunities for IoT developers. The Barrons.com article "Silicon Labs Tuned In for Upside" phrased it this way:

"...we dont think IoT for Silicon Labs will turn out to be an overextended hype cycle. Connected/smart-home adoption has parallels to smartphones in 2008, where developers created unanticipated high-value applications on a platform to drive rapid adoption. From that perspective, 50 billion IoT devices by 2020 does not seem unreasonable."

Other recent articles about MCUs, embedded computing and the IoT have also talked about MCU-developer opportunities in the upcoming months and years. So the question at this point is, how can Humboldt developers get involved with the IoT platform to make money? Ill talk more about this topic in some of the future posts on this blog. But for now, Humboldt MCU developers and users might consider doing some or all of the following activities.

1. Learn a lot about the IoT and microcontrollers and keep up-to-date on these two topics.
2. Learn more about the IoT and MCUs by designing and building unique projects and document them online.
3. Use the internet to document and promote your IoT and MCU knowledge and skill.
4. Teach a class about Arduinos, MCUs or the IoT.
5. Build and promote interesting MCU / IoT products and sell them online.
6. Identify and reach out to knowledgeable and interesting people who are relatively well-connected in the IoT and MCU communities.
7. Use craigslist and other online developer job boards to look for MCU / IoT job or project opportunities and to advertise your availability for MCU / IoT projects and employment.

All the above activities can be done without participating in any of the Humboldt Microcontrollers Group meetings or collaborative MCU projects.

But the above money-making activities can also be done with people who are active in the Humboldt Microcontrollers Group. In my experience, its often more fun and more interesting to work on projects or activities with other people who have complementary or similar knowledge and interests. If youre interested in discussing any of the above IoT money making opportunities, come to the next MCU meeting. Or email me at arcatabob (at) gmail {dott} com.

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