IoT Course Week 14 – Final Projects

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It’s been an intense 13 weeks for both us and the students. Now it’s finally time to dig into final projects. Students were invited to come up with an idea that added some sort of value to the LAMPI product, and we provided some possible ideas. Here are some of the highlights from those projects.

Build An Alarm Clock

For this project, the students created an alarm clock system using LAMPI. Through the web interface they already built, the user can create one or several alarms.

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Because LAMPI doesn’t have a speaker, the students had to improvise and blinked the light on and off several times instead.

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From LAMPI, the user can see the current time as well as snooze the alarm.

Challenges – multiple time zones, transmitting time, conflicting alarms, conflict between light settings and alarm

Natural Light Mode

This was an original idea from the students and not one of our suggested projects. This project used LAMPI to reflect the state of the light outdoors for a handful of benefits, as outlined in their presentation:

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Using the API from OpenWeatherMap, they were able to get sunset, sunrise, and daylight conditions and map them to a color spectrum based on LAMPI’s current time. Because we didn’t have all day to watch the light color slowly change, they also built a demo mode that progressed through a 24 hour cycle in the span of couple minutes.

User / Device Association

By the end of the course students had a functional system that connected a single LAMPI to the cloud. This project focused on expanding the system to accept multiple users, each with a unique LAMPI device. The LAMPI doesn’t have a keyboard and noting that an on-screen keyboard would probably result in a poor experience, these students built a key-generation system similar to Netflix and other services that run on set-top boxes and smart TVs.

When the user presses a button to connect to the cloud, the LAMPI would display a randomly-generated code like this:

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The user can then log into their LAMPI web portal, enter the code, and the device is connected to their logged in account. The codes are only good for one minute, afterwards they would need to generate a new code.

Distributed Load Testing

While we had covered some basic load testing scenarios in a previous week, there was still work to be done. This team of students took charge and starting investigating how to load test a protocol such as MQTT using something like Locust, a LeanDog favorite for load testing web sites. Locust supports HTTP out of the box, but has a plugin system for testing other protocols. These students actually created their own MQTT plugin for Locust and open-sourced it on GitHub. From there, they ran a “locust swarm” of distributed clients from Digital Ocean to attack their Mosquitto broker in Amazon EC2.

Their results were very promising. They were able to flood CPU and network traffic but unable to cause catastrophic failure in the Mosquitto broker. Messages with QOS 1 and 2 eventually got where they were intended to go after congestion resolved, demonstrating why Mosquitto continues to be our go-to MQTT broker:

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Wrapping Up

With final projects completed, we also ran a brief retrospective. We asked the students to post what worked, what didn’t work, and what surprised them. Lots of good feedback came out of this. We were able to hone in on content that was too technical and not technical enough. We learned that homework submissions being due on Monday caused issues as students would often wait until the weekend, a time at which we could only provide limited assistance over Slack. It was also a validation that we had done something right — we received an overwhelming amount of positive feedback, with several students saying how much they had gotten out of the class due to the breadth of the covered topics.

Looking Forward

With our first class finally wrapped up, it’s time to look ahead. Preparations are already being made for a second run. We’re taking the feedback given, making some needed tweaks, and we’ll be ready for a new round of students in the fall. See you then!

Developing an amazing technology product of your own? Take our 1-Minute self-assessment to make sure you’re project is on-track for a successful launch!  Or, reach out to us at LeanDog.com! We’d love to hear all about it!