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Welcome to Cemetech! Since 1999, Cemetech (pronounced KE'me'tek) has been developing software and hardware in many technology-related fields. Among Cemetech's specialties are TI graphing calculators such as the TI-83+/SE and TI-84+/SE, the Casio Prizm graphing calculator, web programming, and DIY hardware projects and modifications.

Our members, enthusiasts, experts, and teachers are led by Kerm Martian, né Christopher Mitchell. Since 2004 he held the title of the world's most prolific graphing calculator programmer, with over 400 completed programs and more than 1.2 million direct downloads. He has also developed many software and hardware projects. Our staff of friendly volunteers hang out on our forum and IRC and SAX chatrooms, and are happy to answer questions.

Numbers: 695 articles have been posted in Cemetech's News Archives. View current site statistics. Within the last seven days, 9 files have been added to the file archives. Click to show the new files.

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Graphics Routines [TI84+CE] by MateoConLechuga
My new Casio Prizm by amazonka
LZ4 Decompression by Unknownloner
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Cemetech Labs Updates
Take Pictures with a TI-84+CSE and a Gameboy Camera on 11/14/2014
WiFi globalCALCnet with the Spark Core on 10/5/2014
Developing WiFi Calculator Communication with the Spark Core on 9/27/2014
PartyMode 2.0: The One-Room Instant Disco on 6/22/2014

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T^3 2015 Wrap-Up: Days 2 and 3, Final Thoughts
Published by KermMartian on March 21, 2015 at 6:14:33 PM CST | Discuss this article (7)

This weekend, I attended my third T^3 (Teachers Teaching Technology) conference, immersing myself in learning how graphing calculators can enrich the STEM classroom. I spent three days at this annual professional development conference hosted by TI Education; Cemetech has already hosted articles about TI news leading up to the conference, the exciting kickoff and opening session, and shared interesting experiences halfway through the weekend. Now that the conference is over and the responsibilities of regular life have descended once more, it's time to look back at the conference and everything we experienced.

Read the whole article for more fun photos from T^3 2015.

Here's what happened during the final day and a half of the conference. In our most recent T^3 article, I mentioned giving a talk on calculator programming shortly before Pi Second, at which TI served several varieties of delicious pie.
  • In fact, Saturday, March 14th was full of all kinds of Pi Day celebrations: it turns out that math and science educators are the perfect crowd with whom to celebrate Pi Day. Besides four or five different varieties of pie at the conference, there was a contest to recite as many digits of pi as possible. I clocked in at a mere 53 digits; the first-place winner recited an impressive 120 digits and received a pizza stone engraved with many digits of pi. I myself got a cool MathemaTIcian shirt and pi pencils for my efforts. Later in the day, TI served pizza, including a pizza with pi formed out of pepperonis on top. To get a slice of pizza, all you needed to do was recite at least 15 digits of pi.
  • For the last couple of years, there has been a long Lua session on one of the days of T^3. Called SLUGfest (Super Lua User Group fest), it's an opportunity for Lua experts and beginners to get together to discuss Lua skills and tricks, particularly as they apply to the TI-Nspire. This year, I was particularly excited to see TI's efforts to promote connecting hardware to the TI-Nspire. Stephen Arnold presented the TI-Nspire Apps for iPad controlling the TI Launchpad MSP430 development board over Bluetooth, and mentioned that they're planning to make the system work with TI-Nspire CX handhelds as well. His demos included a keyboard program that could play a wave of a given shape, amplitude, frequency, and duration over a speaker attached to the microcontroller, a greenhouse with sensors and the ability to build control systems, and a host of other sensor-related projects. We hope that we'll have a chance to help guide these same projects onto the TI-84 Plus series, given our work with ArTICL and many other calculator hardware projects.
  • I participated in TI's first "Tweetup", to which they invited the conference attendees who had been posting statuses and pictures about the conference on Twitter. There was good food, good conversation, and not only did I get a Radical Red TI-84 Plus CE of my own, I won a second one that I ended up declining to avoid hogging all the TI-84 Plus CE (Cemetech user DrDnar ended up with it).
  • The last day of the conference included power sessions, of which I attended a panel about STEM education, and a closing keynote by Emily Calandrelli. I enjoyed getting different perspectives on promoting STEM education and what can be done in math and science classrooms to get students excited about STEM topics in the power session. I also found Ms. Calandrelli's talk to be quite inspiring: she emphasized why STEM is awesome. First, it can make you uncomfortable, and force you out of your comfort zone. Second, it gives you the superpowers to understand the world around you, to be curious, and to attack any problem. Finally, it gives you a ticket to travel and see the world, as many companies and internships will pay you to travel while you pursue STEM projects and jobs. I had the privilege of meeting Ms. Calandrelli at TI's "Tweetup" on Saturday evening as well, and found her to be very personable; she was very involved and enthusiastic about the teaching and learning going on throughout the conference.

I found the conference to be probably the best-attended of the three T^3s that I have experienced, and it was a great opportunity to meet new teachers, TI employees from all over the company, and exhibitors, as well as catch up with old friends. I'm very excited about the conversations (sorry, the conversaTIons) that I had at the conference, including with teachers excited about bringing programming, electronics, and other STEM skills into their own classrooms. I hope you can come check out T^3 in future years, whether you're a teacher, a student, or just a calculator programming community member who is curious to see passion for our favorite handheld devices on the educational side of things.

Left to right: Gayle Mujica and Dr. Peter Balyta kick off the conference; using the TI-84 Plus CE; presenting TI-BASIC on the TI-83 Plus/TI-84 Plus family and a rapt audience member; exploring the TI-84 Plus CE further; Emily Calandrelli during the closing session.

Happy Ultimate Pi Day: T^3 2015 Mid-Conference Updates
Published by KermMartian on March 14, 2015 at 1:11:55 PM CST | Discuss this article (26)

We've enjoyed a day and a half of TI Education's T^3 2015 conference in Fort Worth, TX, and as we head into a sunny, warm afternoon of sessions, I wanted to briefly update you on what we've been exploring and experiencing at the conference. We also want to wish you a very happy Pi Day. Some are calling this an "ultimate" Pi Day, as the year 2015 gives us the (US-formatted) date 3/14/15. At 9:26:53am, TI hosted a celebration with pie and coffee, well-attended by the conference attendees. What are you doing to celebrate this Pi day? We hope that your celebrations involve pi recitations and certainly some delicious pie.

Some updates from T^3 2015:
  • As announced during yesterday's opening session, TI's popular STEM Behind Hollywood initiative (of which we have made complete TI-84 Plus C Silver Edition ports will now be joined by STEM Behind Health. These new Lua activities will show how math, science, and engineering are involved in health and healthcare. The first activity released is Type 1 Diabetes: Managing a Critical Ratio, which challenges students using the TI-Nspire CX to explore ratios and proportionality, biological control mechanisms, and more.
  • We are excited to continue promoting graphing calculator programming as a perfect way to get students involved in STEM. I've enjoyed talking to a number of teachers this year that have integrated TI-BASIC programming into their math and science curricula or are considering doing so, and we'll likely have some exciting news to share around graphing calculator programming in schools in the near future. I also attended an excellent talk by the enthusiastic John Isaacs, a constant proponent of my programming book, on introductory TI-BASIC programming.
  • I spoke this morning about graphing calculator programming in the classroom, primarily to math and science teachers. You can download my T^3 2015 presentation, and if you're interested in buying Programming the TI-83 Plus/TI-84 Plus or Using the TI-83 Plus/TI-84 Plus today, you can get 41% off both books with code "ctwt3ic".
  • At the T^3 2015 reception last night, there was much Texas line-dancing in celebration both of our host state and Texas Instruments' heritage. Math and science educators and engineers are enthusiastic and skilled at line dancing, it turns out! There were also delicious hors d'oeuvres and costumed photography fun.
  • At long last, DrDnar and I both had the opportunity to try out the TI-84 Plus CE in a session taught by John LaMaster. We're not posting official impressions yet, as we haven't had enough time to fairly evaluate the device, but it looks like the screen speed in particular has been greatly improved by 2.6x or more thanks to the new memory-mapped LCD and ez80 processor, while math operations are roughly 15-20% faster. We also got to see some of the features of the new TI Connect CE and TI-SmartView in action.
  • Finally, we have had the pleasant opportunity to talk to a lot of TI engineers and staff here at the conference, and it's great to see the people who make TI's calculators possible interacting with their target audience.

Once again, happy Pi day, and we can't wait to bring you news on the rest of the conference tomorrow!

Left to right: Yours truly with the TI-84+CE; running an ez80 ASM program on the TI-84+CE; exploring TI-BASIC with John Isaacs; Texas line-dancing; a Texas sunrise; Pi Day pie from TI. Bonus points for finding the zombie from Zombie Apocalypse Parts 1 and 2 in the photos.

T^3 2015 Day 1 Kickoff in Fort Worth, TX
Published by KermMartian on March 13, 2015 at 10:48:15 AM CST | Discuss this article (15)

General technology communities have E3 and CES, but we at Cemetech have Teachers Teaching with Technology or T^3, TI Education's annual conference. This year, we're bringing you the minute-by-minute updates from T^3 2015 in Fort Worth, Texas, right in TI Education's backyard. As in the previous two years that I attended, I'm looking forward to attending a lot of fascinating sessions with educators using TI calculators and connecting with teachers and with TI. I'll also be seeing how our mission to spread graphing calculators as a programming tool can fit into what else teachers do in the classroom. As always, keep your eyes on Cemetech for the latest that I and my colleague DrDnar discover here, experiences with the new TI-84 Plus CE, and everything else education and TI-related that we explore.

T^3 2015 kicked off with a drizzly Texas morning walk to the Fort Worth Convention Center, a short distance from our hotel. As is traditional for T^3 conferences, we were first welcomed by Gayle Mujica, TI's Marketing Director, then Peter Balyta, the President of TI Education. Both stressed the utility of the T^3 conference as a way both to learn from and teach your fellow educators and a forum to understand TI's technology and provide feedback back to TI. Since the conference is being held in Fort Worth, there will be a lot more TIers than usual attending. We also heard about tomorrow's Pi Day celebrations, including a 3.14-mile run and plenty of pie. Dr. Balyta introduced the two latest updates for TI's two hero lines: the new TI-84 Plus CE, and TI-Nspire OS 4.0's new math features.

The keynote speaker this morning was Dr. Jo Baoler, a mathematics education professor from Stanford. She spoke about her work in understanding and improving math education, especially with students who think they're just not good at math. Dr. Baoler led with neurophysiological research that shows there truly are not students who are innately better or worse at math, as demonstrated by the neuroplasticity of the brain. She led the audience through a fascinating example looking at how different people look at and interpret a diagram of a set of blocks that grows quadratically. We looked at a group of at-risk teens exploring this problem, and tried to understand what made them so enthusiastic to understand and solve this particular problem. Dr. Baoler left us with a few thoughts about what is good and bad about the state of math education, especially from a neurological standpoint: mistakes are good, and every time you make a mistake and learn from it, you grow a synapse.

If you're here at T^3, I hope you'll stop me, say hello, and share some of your own experiences with programming or with T^3, and keep your eyes on Cemetech for more from the conference.

Left to right: Introductions from Gayle Mujica, Peter Balyta, and Jo Baoler

TI News: T^3 2015; TI-84+CE Contest, Apps; TI-Nspire OS 4
Published by KermMartian on March 12, 2015 at 10:47:56 AM CST | Discuss this article (15)

With Texas Instruments' T^3 (Teachers Teaching Technology) 2015 conference officially kicking off tomorrow, we have collected a few TI-related news items for you. Most center around the new TI-84 Plus CE graphing calculator, which is due to hit stores and educational technology suppliers late this spring. We also are excited to bring you an introduction to T^3 2015 and the Cemetechians who will be attending this year.
  • First, TI has announced a "Calculate Your Color" contest. This faux personality quiz asks you questions about your favorite scientists, with what graphed function you identify, and more. It chooses one of the colors of the TI-84 Plus CE that matches your personality: Original (black), Radical Red, True Blue, Silver Linings, Plum Pi (purple), Lightning (light blue), Denim (navy blue), or Positively Pink. At the end of the quiz, you have an opportunity to enter to win a TI-84 Plus CE in that color. You can take the quiz at CalculateYourColor.com.

  • Of interest to our community assembly programmers is the fact that Apps and OS for the TI-84 Plus CE are now available for download. Until TI releases an assembly SDK for the new TI-84 Plus CE, ez80 assembly programmers who hope to write educational programs, games, and Apps for the calculator will have to derive the information they need from examining the existing Apps and the OS. Unfortunately, preliminary investigations indicate that the TI-84 Plus CE's Apps (.8ek files, for the curious) are signed with a 2048-bit key, which TI will have to release for the community to write Apps.

  • TI has released OS 4.0 for the TI-Nspire, the first major version bump in years. It drops support for the grayscale TI-Nspire calculators, built only for the color TI-Nspire CX calculators, but includes a variety of additional features ennumerated on TI's website. The improvements include new ways to zoom and resize documents in the computer software, orthographic 3D graphing, more ways to label, measure, and select items in 2D graphs and geometry sketches, and the ability to display the R^2 (fit) value for some regressions.

  • Cemetech administrator Christopher "Kerm Martian" Mitchell will be joined at T^3 2015 in Fort Worth, Texas by accomplished developer DrDnar. At this annual conferences, teachers teach teachers how to effectively use TI's educational technology in the classroom. We have three days of exciting professional development to share with you, so keep your eyes on Cemetech's front page. In addition, Christopher will be presenting "Teaching Programming with the TI-83 Plus/TI-84 Plus" on Saturday morning, so we're excited to further our mission of spreading graphing calculator programming as a valuable STEM skill.

Between the TI-84 Plus CE and T^3 2015, the following few days promise to bring many exciting developments that we'll be posting here as well as on Cemetech's Twitter account and Facebook page. If you aren't already following Cemetech on both mediums, you should!


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