Have you ever wondered what your heart rate looked like when you were catching some Zs? Or perhaps you would like to check up on how someone nearby is sleeping, without actually disturbing that person. The ZazHRM monitoring system by Alan Do lets you do both, with a pulse sensor hooked up to an Arduino Uno, which in turn sends data to an Android phone in almost real-time via Bluetooth.
The receiving device runs an MIT App Inventor routine, which can output alarms if the person under observation’s heart rate goes out of range. Results are also logged for later analysis.
While interesting, Do does note that ZazHRM is not a piece of medical equipment, nor is it intended for medical diagnosis. Code and App Inventor info are available on GitHub.
Your heart is an amazing organ, pumping blood through your body and literally keeping you alive. However, building a realistic model of one — as explained in this write-up by Holiday McAllister — can actually be pretty simple.
Here, silicone is poured into a four-inch heart mold to create the structure, partially hollowed out to accommodate a metal gear micro servo.
This little motor rotates back and forth under control of an Arduino Uno, making it appear to pulse up and down on a table. One could see this enhanced in a variety of ways, perhaps with a bit of fake blood for an even more lifelike look, or with inputs to the Arduino for interactive capabilities.
Can robots paint? More specifically, can they create art? The second question is, of course, open for debate, but Technovation’s robotic build shows that they can indeed wield a paintbrush.
The device, shaped vaguely like a Roomba vacuum cleaner, uses a pair of NEMA 17 motors for movement and a third to rotate a sort of brush turret. A servo attached to the pivoting arm positions a brush up and down, dipping it into paint, and bringing it to the drawing surface as needed.
Control is via an Arduino Uno with a CNC shield. The project is capable of producing art randomly, or be programmed to execute pre-defined patterns.
To label used bottles that would otherwise go to waste, “tuenhidiy” created a CNC bottle plotter that itself consists mostly of scraps!
The machine’s X and Z axes are formed out of a pair of old CD/DVD players, but instead of a traditional Y axis, it actuates two printer rollers to turn a bottle forwards or backwards. This allows the marking pen to be placed in just the right axial position, while still being very similar to a fully Cartesian (XYZ) plotter controls-wise.
Everyday you likely visit websites like this one, browsing the content without giving much thought to how it gets to your eyeballs. Of course there is plenty technology required throughout this process, but how much energy does all this equipment consume?
The device utilizes an air pump, with a pressure sensor to take readings via an Arduino Uno that interfaces with your computer. A special Chrome extension calculates the energy necessary to pull up a particular page, forcing you to put in the equal amount of physical effort to display the site in its original form.
Researchers Yunosuke Sato, Ayato Kanada, and Tomoaki Mashimo have developed a novel continuum (snake) robot actuator that can flex and sense its position with twin coil spring assemblies. Each uses a couple of piezoelectric actuators to induce ultrasonic vibrations on a stator block, pushing the spring inside forwards or backwards. When combined, the springs can advance together, or twist left and right when lengths are varied.
Extension sensing is accomplished via voltage feedback through the springs, allowing its Arduino Uno-based experimental setup to determined each position with no extra equipment. With this data, the curvature angle of the two springs together can be calculated, and while the “snake” now works in two dimensions, perhaps such a system could be used with another spring for full 3D control!