It's Time to Light the Lights

For their second turn in the lab, fourth grade is taking their knowledge of circuits to the next level using the Raspberry Pi computer. During their classroom science lessons on electricity and circuits, students learned to create complete pathways for electricity using regular light bulbs and D-cell batteries. In this unit, they used the kinds of electromechanical components employed by digital makers, LEDs, breadboards, resistors, and tactile buttons.

We started by spending a couple of days getting acquainted with these new components. Students built simple circuits using a battery pack and an LED. Then they added a button that could be used to turn the light on when it is pressed and off again when it is released. They had a good deal of time to experiment and tinker adding more LEDs. An interesting discovery many students made is that the LEDs require slightly different voltages so depending on how the circuit was set up, some lights would not light together. My favorite part of this segment of the unit is, after getting all 4 of their LEDs glowing, the teams start clamoring for more lights.

After learning to control their circuits mechanically (with moving parts like a button), students moved to the Raspberry Pi stations to learn how to take control digitally (with computer code). They started by using an add on board called Traffic HAT. Traffic because it is a set of 3 LEDs in red, yellow, and green resembling a stop light, and HAT for Hardware Attached on Top. This saves them from the distraction of learning a new way of wiring the LEDs while also learning the programming constructs that are used to control the circuits. The versions of Scratch that are embedded in the Raspberry Pi operating system have extensions that allow for physical computing (using a computer to control or gather information from physical components like LEDs, motors, buttons, and sensors). This is my favorite part of the entire unit solely because of the excitement that sweeps the room as LEDs begin to blink. What inevitably follows is students tinker with their code creating new effects, then call out to their neighbors to show what they have done.

Next, after becoming comfortable with the coding and still using the Traffic HAT, students use a breadboard and wires to add a button that they can use to control their LEDs. They also learn that the button can be used to make things happen on the computer screen. It can make characters talk or move, backgrounds can be changed, and just about anything else they can imagine. After that, I remove the Traffic HAT and provide students with a box of components like those they used at the beginning of the unit so that they have to build all of their circuits from scratch. Their final task for the unit is to create a game of some kind that uses at at least two LEDs and one button. I provide them with a guide for making a multiplication facts game, but they have the freedom to make any kind of game they want. Some make the math game, while others make quizzes about dinosaurs, Texas history, or Pokemon.

As always, I have been genuinely impressed by all of the creative ways the students have applied their new physical computing skills to the creation of projects that represent their interests and personalities.

It's Cardboard Arcade Season in the STEM Lab

One of my favorite STEM Lab projects, and one of the most over all successful, is the cardboard arcade. It is one of the few units that I have run every year since founding the lab and I have yet to get tired of it. That's because after hundreds of cardboard arcade games passing under my gaze, I am continually surprised by what the students come up with. I have settled on doing this project with 3rd grade for no better reason than it helps students learn the construction techniques that I want them to employ going forward. It demonstrates in a very real way that masking tape is not the best material to hold to large pieces of cardboard together with when people are going to be throwing balls at it for an hour.

For anyone who is not familiar with this unit, it is one of many offshoots from the original Caine's Arcade seen in the movie at the link. In short, a 9 year old boy in Los Angeles named Caine spent the summer at his father's auto parts store and entertained himself by making replica arcade games with the left over boxes around the shop. Filmmaker Nirvan Mulick discovered Caine's Arcade when he stopped in to by a door handle for his car and made a movie about it. Since the film debuted the cardboard arcade has become a staple of the maker movement in schools. 

One of the best parts of this unit is inviting other classes, usually first grade or kindergarten to the lab to try out the games. I have found that when students know they will have an audience from beyond their class and me, they become more deeply engaged and personally invested in their work. They are more apt to take creative chances that result in project far more wonderful than anything I could assign.

Use The Forces!

This rotation of STEM Lab finds the second graders exploring forces and motion by building mazes and marble runs. This is one of those experimental units that I implement from time to time. As a result, each group's experiences and projects were a little different as I tweaked and adjusted based on how well various activities went in previous interactions.

The unit began with students recording some simple observations in their journals how a marble rolls around in a paper box lid with some straws taped to it. I gave them some starter questions, 'how does the marble move when the box is flat? When you tilt the box?' and so on. We discussed their observations and then did some research into force and motion with Brain Pop Jr. Students took notes in their journals about words like motion, position, and force. We discussed how these terms related to their observations.

The first build of the unit was a marble maze using Lego bricks. A Lego plate is, of course, covered with bumps which effects how the marble rolls. This gave us the opportunity to talk about friction and how a rough surface is not as good for rolling objects. What I have ended up loving most about this part of the unit is how creative the students were with their mazes. I saw mazes not just with dead ends, but traps that it was impossible to escape. There were tunnels and bridges. Some mazes had checkpoints that had to be reached in a certain order. Several had the kind of elaborate back stories that second graders specialize in telling. Sure, they learned about the pull of gravity and how the walls push back on the marble to stop it or change its direction, but the creative expression was the biggest win.

The second build brought us back to cardboard box lids and straws as we shifted to making marble runs instead of mazes. The first time through this part I learned the distinction between a "maze" and a "run" was not clear to a number of students. This became evident as the first batch of attempts had dead ends that prevented the marble from reaching the bottom of the box. A bit of explanation and the added constraint that their runs could not have straws that the marble does not touch, and the results improved dramatically. Students were challenged to make runs that used a certain number of straws and that took certain amounts of time to complete the course. I have been really impressed by how the students problem solved for the different design requirements.

There are definitely some things I would adjust about this unit, like additional building materials, surfaces, and marble sizes in order to more deeply examine the effects they have on the outcomes observed. Overall though I am fairly pleased with how this went and I look forwards to its next iteration.

Once Upon a Time... Math

One of the many things I love about teaching in the STEM Lab is helping students make connections across the curriculum. STEM, STEAM, STREAM, whichever acronym you prefer, are all, at their core, about breaking down the walls of the "knowledge zoo" that school sometimes feels like. That is the mindset, unfortunately increasingly prevalent the higher up one goes in the elementary grade levels, that these 90 minutes are for math, not literature, not writing, not science. The next 90 minutes are for another subject in isolation, and so is the next 90, and so on. It is not a realistic model of how anyone uses their learning for an actual purpose. Just about everything everyone does, cooking, assembling furniture, planning a day trip, etc. draws on knowledge from across disciplines that are made for the most part to inhabit lonely cages in a school setting. The STEM Lab is the Serengeti where learning from all subjects roams free.

This rotation in the lab, kindergarten and first grade are being introduced to various math concepts through literature. I have done similar units in years past, but each time the books change, sometimes even from one class to the next. I do my best to avoid the types of contrived stories written by textbook companies. Children can tell the stories are phony and they generally are painfully dull.

I will not launch into a detailed description of each book involved in this unit. I will however share a few of my favorites.

Inch by Inch by Leo Leoni. This one is about a clever inchworm who uses his ability to measure and his wits to avoid being eaten by birds. After reading, the students practice measuring classroom objects with inch tiles and record their data on a table. What I especially love about reading this is that the book also illustrates a number of bird adaptations. We discuss why a flamingo has a long neck and a bill like a shovel and why a hummingbird has such a long and pointy bill.

The King's Commissioners by Aileen Friedman and Susan Guevara. In this book, a king decides that he ought to know how many royal commissioners he has appointed. With some help from the Royal Advisors and the Princess, each employing a different method of skip counting, the total number of commissioners is found. The students are already familiar with the concept of skip counting and know that it is a way of arriving at a total more quickly. What I like about this story is that it illustrates how one handles skip counting when there are "left over" items that are not enough to make another group. When we finish reading, students practice making different sized groups with inch tiles, counting them by the group size, and then adding in the left overs to get the total number.

The Greedy Triangle by Marilyn Burns. This is the story of a triangle who gets tired of doing the "same old things" that a triangle does, namely being roofs for houses, sails for sailboats, supports for bridges, and so on. The triangle decides to visit the Shapeshifter and asks for another side and another angle to make his life "more interesting". The request is granted and, now a quadrilateral, the shape enjoys being books, movie screens, floor tiles, and much more. Eventually though, the shape becomes bored being a quadrilateral, and returns to the Shapeshifter for another side and angle. The pattern continues, the shape is happy for a while as a pentagon, then a hexagon, and on and on, but always goes back to the Shapeshifter for another side and angle, and another, and another. Fortunately, the shape realizes that more sides and angles is not the answer to its dissatisfaction. This book is a great way to introduce students to the concept of shapes being named by the number of sides and angles they have, not by what they look like. The sooner students learn that there is no such shape as a diamond or a house, the better. Following the story, students use pattern blocks to create colorful pictures like those from the book.

I'll stop there, but I really could go on and on. I love this unit so much because of all the math, science, literature, and art that fit so naturally within it.

History, Language Arts, Programming, and Making: Cross-Curricular Candescence in Grades 4 and 5

The first cycle of the year is officially behind us, so it is time to detail the learning adventures our 4th and 5th grade students undertook this time around in the lab.

The 5th graders had a project that is something of an extension of the interactive posters the 3rd grade worked on. Students had their choice of several historical figures to research. Each group had a somewhat different set of people. There was some overlap, but each list was more different that it was similar. I wanted to have a variety of topics, and students, when given a choice of topics like this, tend to latch on to the names they have heard before. They used a variety of sources to gather information including BrainPop and Worldbook Online.

Once they had conducted their research, students set to work creating a Scratch project that shared details about the lives and contributions of their selected topics. Their programs were required to have a minimum of 5 key press events in order to make the final product interactive. They were also required to include at least one image of their person.

The final piece of this project was to transform an old soda bottle (or other ) cylindrical container into a model of their chosen historical figure. They were to make every effort to match the clothing of the time period in which their subject lived. That proved to be an interesting challenge as students tried to make Victorian dresses for Ada Lovelace and aviator goggles for Amelia Earhart with construction paper. These models were then placed on a stand, or in some cases fitted with buttons directly and connected to the Scratch program with a Makey Makey (an input/output device similar to a keyboard, but with conductive pads instead of keys).

I am really pleased with how well most of these projects turned out. The students created a number of clever programs and models to share their work. It is always wonderful to see students take a project in a completely unexpected direction. The Scratch projects are collected in this studio.

As for the 4th graders, they took a big step forward with their Scratch programming skills and learned how to use lists and variables in new ways. In a computer program, a variable is a single value that can change while the program is running. Examples of variables include a player's score, number lives, and timers. A list on the other hand stores several pieces of information, as the name implies. A program might have lists for questions and answers, or one to track the highest scores.


The first program the students worked on was a random compliment generator. They created a list of kind adjectives and another list of animals. First, the program had to ask the user for their name and store it as a variable. Then it replied with the user's name and a compliment created by joining a random adjective and a random noun from the two lists and joining those elements with the rest of the sentence. For example: "Quentin, your are a shiny unicorn!" They learned a number of things about sentence structure and that computers do not know when you want a space between words and when you don't. Some students even added a second list of adjectives for for fulsome compliments.


The second program pushed the classes' knowledge of parts of speech and sentence structure to the limit. They coded a mad lib. They began by writing a 4 sentence story and then selecting the words that would be replaced by user input. The program asked the user for those words based on the part of speech and stored them in a list. Then the program inserted the user's words into the story the programmer wrote. It took a great deal of trail and error and no small amount of problem solving to get the words placed correctly with proper spacing and punctuation. It was a huge challenge and the students were rightfully proud of themselves when they finally got everything functioning as intended.

Here is the studio where the projects are collected.

Makey Makey That Poster Interactive!

The first grading cycle of the year is nearly over, and I find myself a little bit behind on my blog posting schedule. I will do my best to get caught up and to stay on track starting now.

The third graders started the year by "graduating" to the full version of the Scratch programming language. Student who were at Sinclair for second grade got an introduction to Scratch at the end of last year. They only used the offline version and so were not able to share projects or interact with the Scratch online community. So before they began their projects for this unit, they logged into Scratch for the first time. That was after a thorough discussion of the responsibilities of being a member of an online community and correct digital etiquette.

That done, students got to work on the actual project. Students selected a topic to research. Each class had different topic choices in order to have a greater diversity of projects. They used BrainPop and Britannica School to gather information on their chosen subjects and took notes in their journals. The next step involved planning and programming a Scratch project to share their learning. Their programs were required to utilize key press events to run different scripts to share information. I also showed them how to import images to Scratch that were downloaded from the online encyclopedia, and how to cite their work.

Once the programs were finished, students moved on to creating a poster that complemented their programming project. The poster designs were entirely up to the students, and it was interesting to see the choices they made about what information to highlight.

The final step of this project is to make the project interactive. This is done by adding brass fasteners as "buttons" and using copper foil tape as wires. We use a device called a Makey Makey to connect the poster to the Scratch program. It is an input/output board (sort of like a keyboard). The board interprets contact with the buttons as key presses triggering the scripts in the program. So as users touch different points on the poster, different elements of the program run on screen.

Projects like these that use Scratch as a means for students to share their learning are an essential element of the Sinclair STEM Lab program. One of my goals is that students learn to use computer programming to complete tasks, as a tool for doing work as well as for personal expression. Only a small fraction of the students who pass through the lab are likely to become computer programmers or software engineers. But every student that spends time in the Sinclair STEM Lab leaves knowing that computer programming is something that they CAN do, even if they choose not to.

A Foundation of Code

The new school year is well underway and work in the lab is humming along. It has become my habit to start the Kindergarten, first, and second graders with a computer programming unit to kick off the year. It serves as a good introduction and refresher on algorithmic thinking and problem solving skills which are an important part of everything we do in the lab.

For the Kindergartners, this unit is their first experience with computer programming. I start this group of with a number of unplugged lessons designed to provide concrete examples of algorithms and hands on practice with algorithmic thinking. We then move on to turning algorithms into programs in order to give directions to the computer. Students work with the Code.org platform using a programming language called Blockly. This is a block-based language that hides the computer code behind colorful blocks. Students use the mouse to drag these blocks into vertical stacks to create programs that solve different puzzles. The Kindergarten students are in a course designed for pre-readers, so they can create computer programs even though they are just beginning to read. This course also touches on staying safe online and on good digital citizenship. Later in the year, these students will be introduced to Scratch Jr., a programming environment similar to Code.org, but far more open-ended which allows for greater creative expression.

The first and second graders are likewise working in Code.org and using the Blockly language. Their work is also divided between computer-based lessons and unplugged activities. The courses designed by Code.org are leveled for each grade. They are appropriate for complete beginners but also for students who worked in the preceding course the year before. A difference between the blocks that Kindergarten and first grade use, and those used by the second graders is the amount of text. The Kindergarten/first grade block use arrows labeled with the cardinal directions. These initiate a turn as well as a movement in a particular direction. The blocks used in the second grade course separate the turns and the motions, which encourages them to create more finely detailed programs. These students were introduced to Scratch Jr. last year, and will use it later this year to share their learning about different topics. That is my main goal for the computer programming skills students work in the lab, that they learn to use coding to demonstrate their understandings and express their ideas.