Tag Archives: Engineering Students

Robot Garden hopes to make coding more accessible for everyone


This robotic garden demonstrates distributed algorithms with more than 100 origami robots that can crawl, swim and blossom.


Created by MIT’s Computer Science and Artificial Intelligence Lab (CSAIL) and the Department of Mechanical Engineering, the aptly named Robot Garden is a defined as “a system that functions as a visual embodiment of distributed algorithms, as well as an aesthetically appealing way to get more young students, and particularly girls, interested in programming.”

Garden

At its core, the project is a tablet-operated system that illustrates MIT’s cutting-edge research on distributed algorithms using robotic sheep that were created through traditional print-and-fold origami techniques, origami flowers (including lilies, tulips and birds of paradise) that are embedded with printable motors enabling them to ‘blossom’ and change colors, as well as magnet-powered robotic ducks that fold into shape by being heated in an oven.

“Students can see their commands running in a physical environment, which tangibly links their coding efforts to the real world. It’s meant to be a launchpad for schools to demonstrate basic concepts about algorithms and programming,” explains Lindsay Sanneman, a lead author on the recently-accepted paper for the 2015 International Conference on Robotics and Automation.

The project is comprised of 16 different tiles, each connected to an Atmel based Arduino board and programmed using search algorithms that explore the space in different ways. The garden itself can be controlled by any Bluetooth-enabled device, either through clicking on flowers individually or a more advanced “control by code” feature that calls for users to add their own commands and execute sequences in real-time. In fact, users can interact with the garden through a computer interface, allowing them to select a tile and inflate/deflate the flower or change the color of its pedals.

Flower

“The garden tests distributed algorithms for over 100 distinct robots, which gives us a very large-scale platform for experimentation,” says CSAIL Director Daniela Rus, who is also a co-author of the paper. “At the same time, we hope that it also helps introduce students to topics like graph theory and networking in a way that’s both beautiful and engaging.”

The project was recently displayed at CSAIL’s “Hour of Code” back in December, where it surely did its part in inspiring kids to get interested in STEM-related disciplines. In the near future, the researchers hope to make the garden operable by multiple devices simultaneously, and may even experiment with interactive auditory components such as microphones and music that would sync to movements.

Interested? Head over to MIT’s official page here, and be sure to watch the garden in action below.

SingLock is a pitch-based DIY security system


You’ve got 99 problems, but a pitch ain’t one.


With data breaches on the rise, the inability of passwords to keep online accounts secure is more apparent now than ever before. Instead, the use of multi-factor authentication can add another layer of security to fend off malicious attackers. While smart cards and tokens have been implemented throughout the years, a pair of Cornell students Sang Min Han and Alvin Wijaya recently designed their own 2FA system using PINs combined with a form of voice recognition.

singlock

The project, which is aptly named SingLock, isn’t as simple as saying a passphrase either. Based on an ATmega1284P, the system features a pair of password protection stages. Not only does a user need to enter a four-digit numeric identification number via key page, but just as its name implies, a user must also sing the correct pitch into the microphone in order to gain entry. And while, one may be worried about an attacker eavesdropping and attempting to sing the key themselves, the team has implemented a couple of mechanisms to defend against those situations.

Created as a final project for Bruce Land’s engineering class, the Makers reveal that SingLock is relatively more secure than the average keypad and/or keyboard-based systems. In addition, the sound-based security system doesn’t leave residues — such as heat signatures on a keypad after a button press — that may make the system vulnerable to penetration by outsiders. The system itself is comprised of three main components, including a keypad, an LCD user interface and a microphone, making it simple to use for a wide-range of users.

As the duo notes, the keypad and LCD screen serve as the main user interface of the system. Using the keypad, a user is instructed follow a set of directions provided on the screen in order to lock and unlock the system correctly. Both the LCD and the set of two LEDs serve as indicators of the system’s lock state. Initially, both the red and green LEDs are lit. However, when the system is locked correctly, only the red LED is lit. Conversely, when the system is successfully unlocked, only the green LED illuminations.

top_view

“SingLock is built on a few fundamental concepts in signal processing, namely sampling theory and frequency domain analysis of audio signals. Sampling is carried out so that the system operates at a reasonable range of frequencies. Peak-matching calculations performed at every attempt to unlock the system is carried out using the Fast Fourier Transform (FFT) algorithm. We review these signal processing fundamentals in the next section,” the duo explains.

The built-in microphone is responsible for recording the pitch of the user, while the analog acoustic input signal is amplified and filtered to remove ambient noise. This signal is then sampled into a digital signal by the Analog-to-Digital Converter (ADC) of the ATmega1284P. The team then takes the FFT of the sampled signal and match peaks to the stored peaks in the passkey in the frequency domain. If a predefined number of stored peaks in the passkey are found in the stored frequency peaks of the microphone input signal, the system unlocks. Otherwise, it remains locked.

“Most security systems we find today are keypad and/or keyboard-based. Speech, rather than button-pressing and/or typing, is however the main means of communications for most people. It is therefore intuitive to have speech as the basis of encryption when considering human usability factors and ease-of-access.”

Interested in learning more about the megaAVR based system? You can read all about the project, including its components, mathematical theory, as well as how to create one for yourself here. In the meantime, be sure to watch its demo below.