As spotted here, Sam Izdat decided to make a preamplifier for a friend who provides voice talent for audiobooks and the like. The primary audio circuitry for the build is provided by a purchased PCB based on the INA217 chip from TI, but from there things get a bit more interesting.
To complete the project, Izdat added a tiny Arduino-powered OLED display. This shows a VU meter, along with a variety of other animations, seen through a window in the enclosure made from a broken wristwatch.
The device was prototyped using an Arduino Uno, while a Nano was embedded in the final product, allowing everything to fit into the unique compartmentalized enclosure that he constructed.
The amplifier is based on the Texas Instruments INA217 chip, with an Arduino Nano and 128×64 OLED display providing the visualization. [Sam] was able to find a bare PCB for a typical INA217 implementation on eBay for a few bucks (see what we mean?), which helped get him started and allowed him to spend more time on the software side of things. His visualization code offers a number of interesting display modes, uses Fast Hartley Transforms, and very nearly maxes out the Arduino.
Teeuw’s clock features a trio of indicators, properly scaled and labeled for hours, minutes, and seconds, with control via an Arduino Nano, along with an RTC module for accurate timekeeping. Each indicator is housed in its own 3D-printed module, with white LEDs added for visibility.
If you have young kids, you’ve probably realized that they don’t exactly like to sleep in. While their energy levels are enviable, if their clock-reading skills haven’t yet caught up, this device by maker “JonathonT” looks like a great and simple solution.
With help from an Arduino and an RTC module, Jonathon uses a trio of LEDs to show red for “stay in bed,” yellow for “almost time,” and green to indicate “you can get up.” While the current 7:00am starting time might still seem early to some, when compared to his son’s previous 5:30-or-so awakening, this is a huge improvement. Cleverly, the LEDs are diffused with a normal white plastic stadium cup with wax paper inside, making it a very accessible project!
GREEN MEANS GO!!! RED, STAY IN BED!!! This simple, inexpensive Arduino real-time clock can be set to light up LEDs at whatever time necessary. For us that means at 6:00am it turns RED, STAY IN BED. Then 10 minutes before 7:00am it turns YELLOW giving the indication it is almost time to come out and to play in your room. Then at 7:00am… “The light is GREEN!!!”, he says, as he bursts into our room each morning no earlier than 7:00am. What a lifesaver!!!
Each of the four legs are driven using 9g micro servos, controlled by an Arduino Nano. A human operates the spider-inspired robot with a remote consisting of an Arduino Uno and a small joystick module, while pair of NRF24L01 radio transceivers provide a link between the robot and controller.
Despite its simple construction, the quadruped moves around impressively well…
For the most part, the next generation of wearable technology development has been focused around your wrist, arm, ears, and even your face. Hair, however, remains a unique and much less explored material… until now, at least.
That’s because the team of Sarah Sterman, Molly Nicholas, Christine Dierk, and Professor Eric Paulos at UC Berkeley’s Hybrid Ecologies Lab have created interactive hair extensions capable of changing shape and color, sensing touch, and communicating over Bluetooth. The aptly named “HairIO” conceals a skeleton of nitinol wire, a shape memory alloy (SMA) that morphs into different forms when exposed to heat. An Arduino Nano handles control, enabling it to respond to stimulus such as messages from your phone using an Adafruit Bluefruit board.
That’s not the only trick of these fibers, as they can use thermochromic pigments to change color along with the SMA action, and respond to touch via capacitive sensing.
Human hair is a cultural material, with a rich history displaying individuality, cultural expression and group identity. It is malleable in length, color and style, highly visible, and embedded in a range of personal and group interactions. As wearable technologies move ever closer to the body, and embodied interactions become more common and desirable, hair presents a unique and little-explored site for novel interactions. In this paper, we present an exploration and working prototype of hair as a site for novel interaction, leveraging its position as something both public and private, social and personal, malleable and permanent. We develop applications and interactions around this new material in HairIO: a novel integration of hair-based technologies and braids that combine capacitive touch input and dynamic output through color and shape change. Finally, we evaluate this hair-based interactive technology with users, including the integration of HairIO within the landscape of existing wearable and mobile technologies.
Performing an instrument well is hard enough, but flipping through sheet music while playing can slightly delay things in the best case, or can cause you to lose your concentration altogether. Music displayed on a computer is a similar story; however, Maxime Boudreau has a great solution using an Arduino Nano inside of a 3D-printed pedal assembly.
When set up with software found here, Boudreau’s DIY device allows you to control PDF sheet music on your laptop with the tap of a foot. While designed to work with a macOS app, there’s no reason something similar couldn’t be worked out under Windows or Linux as needed.