During our Fourth of July sale, running through July 6, use coupon code SUMMER in your shopping cart to save 10% on some of our favorite red, white, and blue kits, and other fantastic supplies for great summer projects!
We built a evaporating-hand water clock using a WaterColorBot fitted with a Buddha Board. The Buddha Board is a black board with a gray ceramic coating that becomes transparent when wet, so you can paint on it with plain water to make black marks that disappear as the water evaporates. (And, it fits nicely in a WaterColorBot with the appropriate jig.)
As a clock, once a minute it draws the minute hand, then the hour hand, and finally the outline of the clock face.
As the water evaporates over the course of a few minutes, the old minute hands fade away. It’s a neat effect.
Today we’re introducing version 2.0 of our “Three Fives” Discrete 555 timer kit. Version 2.0 has a number of little tweaks and improvements, with a cleaner design and — coolest of all — an all-new set of smooth anodized aluminum legs.
The Three Fives kit is a faithful and functional transistor-scale replica of the famous 555 timer integrated circuit — one of the most popular and well-loved chips of all time. (An original NE555 IC is shown above for scale.)
We are also releasing the first version of our educational supplement for the Three Fives kit: A detailed description of how the 555 circuit actually works, with plenty of opportunities for further exploration. You can find it on the downloads section of the product page or on our documentation wiki.
A minor bump for one of our little open source Arduino add-ons. The Simple Relay Shield is an easy to use single-relay board that does one thing, and does it well: It adds a beefy little mechanical relay to an Arduino, which you control through pin Digital 4.
Version 2.0 adds the ability — by popular request — to control it from a pin other than D4. Solder the jumper in the normal way (in location JP), and it works on pin D4. Hook it up to any other digital pin, say to D7, and now you have a relay on that pin. The Simple Relay Shield is available as a complete soldering kit or as a bare PCB, and you can find documentation on our wiki.
We’re pleased to announce the availability of the Egg-Bot Electro-Kistka: An electric hot wax pen designed to be used with the EggBot. A kistka is the wax tool used in the traditional wax-resist and dye (batik) method to produce colorful eggs in the same fashion as Ukranian pysanky.
We would like to acknowledge that this is not by any means the first time that anyone has strapped a kistka to an EggBot— We wrote about Ann’s DIY version a few months ago, and we’ve seen other versions (both manually heated and electric) in YouTube videos dating back several years.
The Electro-Kistka consists of two main parts, connected by a cable: A heater assembly that gets mounted to the EggBot’s pen arm (in place of the usual pen holder), and a power control board that sits behind the EggBot.
The power control board is relatively simple: it accepts input from a plug-in power supply, and has an adjustment pot so that you can set the power level of the kistka.
The heater assembly has two parallel surfaces that you can see in the pictures. The upper is a yellow circuit board with control electronics, and the lower red part is a machined aluminum heater block that holds the actual kistka tip.
The kistka tip (right) has a small wax reservoir at the top and a smaller-yet point on the bottom that feeds molten wax onto the egg surface through gravity and capillary action.
Designing a good kistka tip is an art unto itself, and we are using field-proven kistka tips, wax, and other accessories from Folk Impressions, manufacturers of the excellent “white handle” electric kistka. The tips are interchangeable and a number of sizes are available. For all of the examples shown here, we’re using only the #2 (medium) tip that comes with the kit.
The basic wax resist process is as follows: Apply wax to the parts of the egg that should remain the present color, and then dye the entire egg a different color.
For a simple two-tone image — white on black — we started with Mark Twain, one of our example images from the StippleGen project. From a user standpoint, drawing wax onto the egg works exactly the same way as using a felt tip marker in the EggBot — it’s just a different tool that does the drawing. The wax itself is black-colored beeswax, which is nice because you can see it against the egg.
After the EggBot finishes, we dip the egg in dye for a couple of minutes, and leave it to dry on a grid of little nails.
Once the egg is dry, we remove the wax with a heat gun on the low setting (a glorified hair dryer…) and a tissue. With the black wax gone, the contrast is stunning. (If you are interested, here is how it looks before the wax is removed.)
Another example of a two-tone egg. Alternately, you could dye the egg before the wax resist first goes on (say, yellow), and then dye it blue afterwards. The end result would be yellow lettering on a blue background.
Making multicolor eggs uses the same process, but with added complexity. For this example, we applied wax resist on a bare (white) background, and then dyed the egg yellow and allowed it to dry (upper right). We then applied a second layer of wax, dyed the egg red and allowed it to dry. Finally, we applied a third layer of wax (lower left), dyed the egg blue, and allowed it to dry. The results after removing the wax (lower right) show the white, yellow, red, and blue areas — not bad!
A caveat: It is harder than it looks. While two-tone eggs are straightforward, we have found it to be challenging to precisely reposition an egg after removing it for dying. Thus, it takes considerable patience and experience to produce multicolor eggs with good registration between subsequent color layers. We’d be interested in exploring better ways to do this.
The Egg-Bot Electro-Kistka begins shipping this week.
I’ve probably said it a million times, but I don’t think I’ve told you guys. You’re amazing. When it’s time for a new project I jump over to EMSL first. I use your projects to demonstrate a lot of STEAM principles at my Makerspace, and proudly wear my EMSL STEAM shirt every Saturday morning when I’m teaching our Makerspace Cadets class. (It’s a fun sciencey/makey/artsy class for kids). Keep up the great work. :)
Thank you for the kind words, and for your dedication to your students!
We’re very pleased to announce some updates on the WaterColorBot project— the watercolor-painting pen plotter that we designed in collaboration with Super-Awesome Sylvia. First and foremost: kits are (finally!) available from stock at our store, now that we’ve finished shipping the rewards from our Kickstarter campaign and our other pre-orders.
We’ve also been working on a host of new applications and accessories that we’ll be writing about in the near future. The first new accessory is the Buddha Board holder pictured above, which indexes a Buddha Board (overly-interactive website link / Amazon.com link), that lets you make temporary paintings with just water. We’ve found the Buddha board not only to be one of the best tools for trying out new things on the ‘bot (without using up paint and paper) but also to be great for live demos of the WaterColorBot, so that you don’t need to provide a fresh sheet of paper for everyone that tries it out. You can find it in our new index of WaterColorBot accessories.
We’re running a Thanksgiving sale in the shop: save 20% or more on selected kits and components, Black Friday through Cyber Monday with free US shipping for all orders over $75.
Despite what you might guess from the name, our Egg-Bot kit is not just for eggs. In fact, it turns out to be a pretty freaking amazing machine for decorating and personalizing your own Christmas ornaments!
Today we’re releasing the “Eggbot Holiday Super Pak” — a set of Eggbot-ready holiday ornament designs to give you a head start. The set includes the designs above and many more. It’s free, available for download here (2.2 MB .zip file), and will be periodically updated as we add more designs.
Read on for some additional tips and tricks for using ornaments in the Eggbot!