Planning to make that carved a pumpkin last past Halloween night? Forget the tealight or LED candle—here’s an easy, no-solder project that will make it extra special. By default, this jack-o-lantern looks like it has a flickering flame, but get close enough to it and it goes crazy with color.
All you need is an LED matrix, a Rainbowduino to drive it, a PIR motion sensor to trigger the random colors, and a power source. [Alpha Charlie] kept the electronics from becoming pumpkin-flavored with some plastic bags. Since he used the PIR as the jack-o-lantern’s nose, there is a bit of plastic behind it to keep moisture from interfering.
[Alpha Charlie]’s build instructions are quite detailed, which makes this project even simpler if you’ve never used a PIR before. There are lots of ways you could build on this project to make it your own, like using trick-or-treater motion to trigger screams or spooky sounds, or add more sensors to make it more interactive. Watch it react after the break.
If you have nothing else at all to do between now and trick-or-treat time, you could bust out the soldering iron and recreate this 70-LED matrix jack-o-lantern. Blinkenlights too safe for your tastes? Fire-breather it is, then.
Continue reading “PIR Jack-o-Lantern Sees Them Coming”
[Stephpalm] had carved a pumpkin for the first time in two decades. Unfortunately, the neighborhood squirrels were all too pleased with her work and devoured it. Her original goal for the jack-o’-lantern was to have its lights controlled over the internet. These hungry critters inspired another project instead – The Jack-’o’-Lantern Squirrel Early Warning System. There have been hacks that have dealt with pesky squirrels before, such as a trap and an automatic water turret, but they didn’t have the ability to post to social media like this system does.
The system consists of a Spark Core, a passive infrared (PIR) sensor, and a piezo buzzer. When the motion sensor is triggered the buzzer sounds, scaring away any peckish creatures lurking nearby. [Stephpalm] used an NPN transistor and 1k-Ohm resistor to provide enough current to drive the buzzer. All of these components were connected using jumper wires and a breadboard that sits on top of the pumpkin. As a nod to her original idea, [stephpalm] then created “Pumpkin Watch Code” and loaded it into the Core. It posts preset messages to a Twitter account every 45 minutes of inactivity or whenever a pesky squirrel is detected. The messages can be personalized for anyone who wants to make one of these themselves.
We wonder if it would be better to place the breadboard inside the jack-o’-lantern and carve out a couple of holes on top for the PIR sensor’s wires to come out of. That would offer some protection from the elements and prevent it from getting knocked over. We think this project could be adapted for many other uses. After the break, see a video of the system in action!
Continue reading “Scare off Squirrels and Tweet about It with the Jack-O’-Lantern Warning System”
Sheer luck brings a Halloween themed project for this Fail of the Week post. [Stryker] wrote in to the tips line to share a link to what is an extremely awesome hack. He carved
four three different faces on the sides of his pumpkin, then sliced the eyes, nose, and mouth into different sections. Couple this with an internal skeleton made of wood and PVC and he’s got himself a nice hack which lets trick-or-treaters spin the sections to select one of up to 27 different faces.
The sections do spin rather well and the finished project looks fantastic. So what is it that failed? We’ll cover that after the break.
Continue reading “Fail of the Week: 27 Face Jack-o’-Lantern”
It’s time to get those jack-o-lanterns twinkling for Halloween. If you don’t want to use candles or buy a jack-o-lantern light this Halloween you can do like [Johannes Bauer] and code your own pseudo-random flickering super bright LED. His wife wanted their pumpkin to be illuminated this year and he knew it would be easy to do with an Arduino, but that would be overkill for such a simple project. Plus, he doesn’t have an arduino. [Johannes] used very few components; 4 slightly depleted AA batteries, a super bright LED, 680 ohm resistor and a little custom code on an 8 pin ATtiny13. The circuit does work great for a pumpkin lantern but his video is more of a tutorial on coding linear congruential generator (LCG) for the 8 bit pseudo-random LED flickering.
The code is short and can be gleaned from the YouTube video. [Johannes] used avr-gcc to compile and has packaged his code and build scripts for download. The hex file can be flashed over to the chip using avrdude or AVR Studio. If you have any ATtiny13s lying around you should cobble this hack together just in time to emulate that real look of a pumpkin candle without the hassles and hazards of real flames.
If you want something with a lot more light that still has that candle like flicker then checkout “Flickering Pumpkin Lanterns” that used the signal from LED tea lights to power some 12 V lamps.
Follow along after the break to watch [Johannes Bauer’s] video.
Continue reading “Pseudo-Random Flickering Jack-O-Lantern LED using ATtiny13”