Mosfets – They can be “on” — They can be “off” — They can even be in between! Tonight at NERP, entrepreneur, engineer, and really good teacher Ste Kulov will guide us into the world of mosfets. Metal Oxide Semiconductor Field Effect Transistors if you want to impress your friends.
Since mosfets are a wide and deep subject, I asked Ste where he wanted to focus his talk. With great economy of words, he said it better than I could.
“Most of the generic stuff, fairly quickly. A few simple examples I was probably going to cover are: making a logic inverter, a logic controlled load-switch, and reverse battery protection. Simulating in LTspice [circuit CAD], since I can draw that stuff in two seconds and put it on the screen. If you want to do a power MOSFET application, I would need to see the datasheet for it. Also keep in mind that high current stuff is no good for breadboards. If you need a list: 4 vs 3 terminal, body diode, Rds(on), gate drive, switching speed, N-channel, P-channel, CMOS digital logic, CMOS analog switches.”
NERP is not exclusively Raspberry Pi, the small computer and embedded systems interest group at Pumping Station:One in Chicago. NERP meets every other Monday at 7pm at Pumping Station:One, 3519 N. Elston Ave. in Chicago. Find NERP and Pumping Station:One at
As you may have noticed, the Small Metals area has moved to where hot metals used to live. The process has been gradual but successful. We conducted an experiment over the weekend involving plaster investment and molten bronze. There were many variables in this process including new-to-the-space machinery: the kiln, the electric melting furnace, and the vacuum investment table. As well as different materials used, possibly expired flux, a new kind of plaster, and a type of bronze that had been melted a number of times before. All in all it was a great success. Here is a brief overview along with some photos to enjoy.
Fresh out of the pickle!
Finished rings! All of them (except the black stone in the middle) were cast at PS:One.
Former PS:1 president Derek Bever and I were joking in the PS:1 IRC chat room awhile back about using the Shopbot as a tool for uses it was not designed for, and turning it into a plotter seemed especially ridiculous. Since I’d wanted to learn how to use the Clausing lathe, it dawned on me that this ridiculous idea could, in fact, become a terrifying reality. So thanks to Anna Yu who taught me how to use the lathe, I made a bit with an 11mm bore to fit into the 1/2″ collet on the Shoptbot:
Having spent the time to make the part, it seemed silly to stop there, so I realized I’d have to make a post-processor for VCarve and Aspire (Fusion 360 coming soon!). I already had experience with Shopbot’s post-processors, creating a “Always turn spindle off” version of Ryan’s “Always turn spindle on” post processor as well as the XYZ Zero Finder program that works with the XYZ plate made on the Bridgeport. So hunkering down on the computer in the CNC Lounge (where Aspire is installed), I made a “Sharpie Bit” post processor that 1. always turns the spindle off, and 2. always sets Z to 0, regardless of what is done in Aspire or VCarve. This also means you have to explicitly set Z’s 0 position without use of the Z plate as there’s nothing to tell the machine when the ‘bit’ is at the right spot.
The first attempt was made using some cardboard I found in the garbage. This test did not go well because I had set Z to 0 in one corner of the cardboard, but because the cardboard was folded over, it was more puffy in the middle, which means that the Shopbot happily plunged the sharpie into the cardboard. Oops. Try #2 used a piece of acrylic that was laying around and I assumed was garbage, so I used that and the second attempt went much better. Inspired, I grabbed some acrylic from my shelf and made the version below.
I’m going to clean up the code a little (like removing a bunch of debugging stuff, unnecessary pauses, etc.,) and then will run it by Matt (CNC area host) and if he’s cool with it, the bit will go in the drawer and the post processor available to anyone using VCarve and Aspire.
“Replicape is a high end 3D-printer electronics package in the form of
a Cape that can be placed on a BeagleBone Black. This page is about
the Major revision B. It has five high power and low noise stepper
motors with cool running MosFets and it has been designed to fit in
small spaces without active cooling and without the need for physical
access to the board once installed. That means no potentiometers to
trim or switches to flip.”
NERP is not exclusively Raspberry Pi, the small computer and embedded systems interest group at Pumping Station:One in Chicago. NERP meets every other Monday at 7pm at Pumping Station:One, 3519 N. Elston Ave. in Chicago. Find NERP and Pumping Station:One at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
Doors open at 6:30pm. NERP is free and open to the public. Ed Bennett ed @ kinetics and electronics com Tags: electronics, embedded, NERP, Open Source, raspberry pi, hackerspace, Beagle Bone, Pumping Station One
I machine-knit these finger sleeves from a conductive yarn that changes resistance as the knit is stretched.
With this project, I wanted to design a glove that could be machine-knit for workshops cheaply and quickly, making a wearable bend sensor available to people with no textile skills.
With a range of sleeve sizes, users can select the sleeve with the best fit and resistance range for each digit. We attach flexible silicone wires by means of a snap press, and the wearer then sews the wire in place with a tapestry needle and yarn — very easy! Once the sleeve is finished, the user can use the tapestry needle to easily sew the wire leads in place along a fingerless glove.
Get your own “digit” sensor at the PS:One workshop on March 25. Details and RSVP on Meetup. (Workshop fee: $10.)
Jenna Boyles, Kyle Werle, and Christine Shallenberg beta-tested the sensors at Pumping Station: One. They selected sleeves for fit, then stitched on the wires themselves. Kyle and Christine were able to use the sensors to control an analog synth and a processing sketch.
I am making a coloring book. The way is fraught with fears, doubts, and time eating mechanical failures. Fears of being unable to make my goals. Doubt that my art is worth the investment of strangers. Battles with an old scanner not being compatible with my computer. Then a crashed computer bios that corrupted my RAID drive. I lost a lot of files. But I am winning. I am winning thanks to very good friends who encouraged my talents. I am winning with the support of my very wonderful family that helped me in times of need. I am winning because of my tenacity in the face of problems. It is only a matter of time in this book battle of attrition. “Today I Draw Dragons” will be a thing.
I will encourage you too to tread the path of book making. Be not daunted by the endless tasks before you.
This project began when I started to draw dragons before work and then after work. I began to count them. I told myself that when I made thirty five of them I would pursue making them into a coloring book. I ended up making one hundred and fourteen of them.
I shopped around for publishers. It is a sea of frustration. You have your easiest ride if you can wrestle the support of a professional publishing company, but they will have a say in your product and it is hard to convince them that you are worth it. So I decided to pursue self publishing, at least for now. If I prove myself with a successful project, then I will show them what I can do.
None of this is the way to wealthbut it is the way of artists.
I learned many things. I learned that even if I print only 30 dragon images it will be considered a 60 pages plus book to a printer even if I don’t print on both sides of the sheet of paper. If you have a place to store 1000 books and the cash to buy and ship them then you might be able to get them printed for a competitive price. ISBN numbers are expensive if you buy just one.
Advertising matters. My Kickstarter shows a definite lull in support when my computer crashed and I could not reason out how to advertise without my scanned and worked drawings. My friends and family took up the slack then. I continued. I made business cards and flyers to paint the town. I wish I had done more. But I am still winning.
Cleaning up and re-working scans for print TWICE is annoying.
I have an external hard drive now so I can back up the back ups.
Learning all the programs for formatting everything for print is a huge pain in my pinky toe.
I still have many tasks ahead. I need to subscribe to a download service so that I can deliver my PDF. files. I need to secure a high quality printer for the prints I have sold. I need to prepare to wrap and mail out my books. I need to make all the custom sketch cards and commissioned art sold to fund this endeavor. I will need a plan in place to sell the extra copies I am going to order. And I need to draw more, lots more.
This will not be my last publishing adventure, by far.
There are still a few more days if you want a copy of the book yourself:
After months of work, hours of troubleshooting 3D printers and lasers, as well as a lot of patience, I’m proud to present my completed cosplay mask of gynoid Drossel von Flügel. My friend Jaina helped me take pictures at Katsucon last weekend in National Harbor. (Yes, the sameconvention center, unfortunately)
Note: almost all images can be clicked for full size.
I have received no shortage of help from various people. The CNC department at Pumping Station: One has been great at supporting those who want to make things. Twitter user @ByNEET released a full model of Drossel which my friend Faraday (she does 3D work! fortunafaradaze at gmail dot com) helped disassemble for conversion into 3d print friendly STL files. My friends who spent countless late nights with me while I worked on this project. My mom, who was very helpful in assembling the mounts to hold it on my head at the last minute. My friend Amir, who introduced me to Pumping Station: One which has made a huge impact on me. Lastly, the PS:One community itself, for maintaining such a wonderful place to create and share as a community.
Below the read-more is a fairly detailed explanation on how I created the mask and what tools I used for those who are interested in pursing similar projects. Feel free to contact me (Skylar) with questions at SKY at TUNA dot SHor find me at the space! I also have a (photography) website, http://hexbee.net.
Welcome all woodworkers and would-be woodworkers to PS:One’s woodworking club, currently meeting Mondays at 6:00 p.m. and hosted by Wood Shop Authorizer, Andy L.
Thanks to all who attended the first meeting of the Zen Woodworking Club!
Many diverse woodworking interests represented, from furniture design, to carving, to antique tool restoration to tool making. We did a little tool sharpening and cut some dovetails and only lost 2 pints of blood (total)…
Here’s a guy I once met, who’s method I loosely copy for introducing dovetails. You can also see a lot of stuff for our equipment wish list in his shop! ~ Andy L.
Do you make things at Pumping Station: One? Do you want to volunteer and help us show the awesomeness of PS:One at Maker Faire? We need you! Pumping Station: One will have a Makerspace booth at Maker Faire Chicago, April 22nd-23rd 2017, and we want to help you exhibit your stuff! Click HERE for our volunteer and exhibition form and let us know when you want to show your work, or when you’re free to help us set up and run our booth.
If you have a larger project, or a demo, or something that you just want to show independently, you can go HERE to fill out an independent Maker Exhibit application, and make sure you let them know you want to be set up near the Pumping Station: One booth. We want a HUGE PS:One presence at this Chicago Maker Faire, so please, sign up, tell your friends, and let them know we need Makers!