With only a week left until Valentine’s day, [Henry] needed to think on his feet. He wanted to build something for his girlfriend but with limited time, he needed to work with what he had available. After scrounging up some parts and a bit of CAD work, he ended up with a nice animated LED Valentine heart.
[Henry] had a bunch of WS2812 LEDs left over from an older project. These surface mount LED’s are very cool. They come in a small form factor and include red, green, and blue LEDs all in a single package. On top of that, they have a built-in control circuit which makes each LED individually addressable. It’s similar to the LED strips we’ve seen in the past, only now the control circuit is built right into the LED.
Starting with the LEDs, [Henry] decided to build a large animated heart. Being a stickler for details, he worked out the perfect LED placement by beginning his design with three concentric heart shapes. The hearts were plotted in Excel and were then scaled until he ended up with something he liked. This final design showed where to place each LED.
The next step was to design the PCB in Altium Designer. [Henry’s] design is two-sided with large copper planes on either side. He opted to make good use of the extra copper surface by etching a custom design into the back with his girlfriend’s name. He included a space for the ATMega48 chip which would be running the animations. Finally, he sent the design off to a fab house and managed to get it back 48 hours later.
After soldering all of the components in place, [Henry] programmed up a few animations for the LEDs. He also built a custom frame to house the PCB. The frame includes a white screen that diffuses and softens the light from the LEDs. The final product looks great and is sure to win any geek’s heart. Continue reading “Animated LED Valentine Heart”
[Stacey] wanted a more interesting way to monitor events related to her Twitter account. What she ended up with is a beautiful animated heart light.
She started out by designing the enclosure. Having access to a laser cutter, she opted to make it out of thin plywood. [Stacey] used an online tool called BoxMaker to design the actual box. The tool is very simple to use. You simply plug in the dimensions of the box and it will provide you with a two dimensional template you can use with your laser cutter. The resulting plywood pieces fit together like a puzzle. The heart piece is made from frosted acrylic and was also cut by the laser.
To light up the heart, [Stacey] opted to use NeoPixels. These are like many of the RGB LED strips we’ve seen in the past, though the pixel density is higher than most. She cut up the LED strip into the appropriate sizes and glued them to a piece of plywood in a rough heart shape. She tested the lights during each step so she would know exactly when any errors were made.
[Stacey] opted to use a SparkCore to control the LEDs. This had the advantage of including WiFi connectivity out of the box. [Stacey] started with NeoPixel example programs, but quickly realized they all relied on the Delay function. This was a problem for her, because she needed to constantly watch for new Twitter events. She ended up having to write her own functions that relied on interrupts instead.
[Stacey] then wrote a Node.js script to monitor twitter and control the Spark. The script watches for specific events, such as one of [Stacey’s] tweets being re-tweeted, or a user unfollowing [Stacey]. The script then sends a message to the Spark to tell it which event just occurred. The Spark will then repeat the event until a new one occurs. Check out the demonstration video below. Continue reading “TweetHeart Shows You Some Love”
A few years ago, [Addie] over at Tymkrs put together a spooky little Halloween project: a small Propeller board that emulates the electrical signals in a heart. As a cardiac nurse, she thought her project could use a little improvement, and after two years she’s finally done. It’s a heart-shaped board that simulates electrical signals moving through the heart.
There are several key areas that conduct electrical signals through the heart – the sinoatrial node, atrioventricular node, and bundle branches all work like players in an orchestra to keep a heart beating like it should. If something goes wrong with one of these, the heart goes into tachycardia or fibrillation – not good, by any measure. [Addie]’s board simulates all the different ways a heart can go wrong with LEDs standing in for the electrical signals in a real heart. The name of the game here is to look at the LEDs and tell what state the heart is in.
The PCB heart is just one part of [Addie]’s heart simulator. The simulated heart can also plug into a neat little heart-shaped project box wired up with a solenoid, LCD display, headphone jack, and other electronics to turn this electronic heart into a complete study tool for heart rhythms. The nurses in [Addie]’s unit love the thing, and it looks like [Addie] might have a real cardiac training tool on here hands here.
Continue reading “Heart-shaped heart simulator”
If all [Blake] wanted to do is scroll “Blake loves Kim” on some LEDs he could have stopped with the breadboard version of the project. Or hastily craft a cardboard heart around the marquee. But he really just used this heart-shaped electronics project as an excuse to get his feet wet with several different types of manufacturing.
The project started as a simple scrolling message pendant. Something along these lines. His very small LED module was being driven by an ATtiny85. He planned to run it from battery which is a perfect excuse to learn how to use the sleep functions built into the chip.
The initial design worked so well he decided to lay out his own circuit board. This made it quite simple to add in a side-positioned button to wake from sleep, and a coin cell battery holder on the back. He used OSH Park for board manufacturing — good thing they allow creative board outlines. To protect the circuitry he also ordered laser-cut acrylic plates that work in conjunction with stand offs to form a case.
He mentions he missed his Valentine’s Day delivery date by a long shot. But that’s how these sort of things go, right?
Continue reading “Heart-shaped project takes no shortcuts”
It’s not too late to hack your own Valentine’s day gifts. Here’s four projects to get you headed in the right direction.
[Ian] built what he calls the Valentine’s gift bomb. It’s a cigar box with this LED heart on the top. A servo motor latches the lid from the inside and won’t open until the thing goes off on the big day. (sorry, no link to this one as he just sent us the pictures found after the break).
A Blinky Bouquet
[Ryan] shows us how to make a felt bouquet and then light things up with some LEDs.
Pictures in a bottle
Reuse that old incandescent bulb by adding LEDs and heart-shaped pictures inside the glass enclosure.
This cocoa container turned robot cat calls, raises its eyebrows, and blinks the LEDs eyes when she presses the button on top.
Continue reading “Hackaday Links: Valentine’s Day, 2013″
[Robert Mibus] took on a project which his kids could present to Mom on Mother’s Day. It’s an LED heart built into a ring or necklace box. The series of white LEDs are animated in a chase pattern. The project let [Robert] push his comfort boundaries by moving past a stock Arduino board.
Inside you’ll find an ATtiny85. He picked up the chip to try running Arduino sketches on smaller hardware. But the total of five available I/O pins presented an issue with driving the LEDs. Ten LEDs are used here and even a standard multiplex display would need no less than seven to control them without additional chips or the need for Charlieplexing. His solution was to drive two opposite LEDs at once, which cuts the need down to his five available pins.
Once he got it all soldered together he realized that he had made a coding error. But a few soldered wires let him reflash it in place using ISP.
Continue reading “Mother’s Day heart chaser”
Here’s something we thought we’d never see on Hackaday. [Chris Suprock] is developing an artificial heart he calls Steel Heart. It’s an artificial heart powered by electromagnets and ferrofluids.
The idea behind [Chris]’ artificial heart is ingenious in its simplicity. An elastic membrane is stretched across a frame and a magnetic liquid (or ferrofluid, if you prefer) is poured across the membrane. An electromagnet is activated and the membrane stretches out, simulating the beating of a heart. Put a few of these together and you’ve got a compact, biologically inert pump that’s perfect for replacing an aging ticker.
[Chris]’ plan to use ferrofluids and electromagnets as an artificial heart give us pause to actually think about what he’s done here. Previously, artificial hearts used either pneumatics or motors to pump blood throughout the body. Pneumatic pumps required plastic tubes coming out of the body – not a satisfactory long-term solution. Motor-driven pumps can rupture red blood cells leading to hemolysis. Using ferrofluids and an elastic membrane allows for the best of both worlds – undamaged blood cells and transdermal induction charging.
Not only is [Chris] designing a freaking artificial heart, he also came up with a useful application of ferrofluids. We were nearly ready to write off magnetic particles suspended in a liquid as a cool science toy or artistic inspiration. You can check out [Chris]’ indiegogo video with a demo of the ferrofluid pump in action after the break.
Continue reading “Building an artificial heart with ferrofluids”