sewable electronics kit guide v1.
LilyPad Sewable Electronics Kit Guide v1.
INTRODUCTION 1 INTRODUCTION 6 LILYPAD BASICS 18 PROJECT 1: GLOWING PIN 28 PROJECT 2: ILLUMINATED MASK 38 PROJECT 3: LIGHT-UP PLUSH 54 PROJECT 4: NIGHT-LIGHT PENNANT 70 TROUBLESHOOTING 72 GLOSSARY Page 7
LilyPad Sewable Electronics Kit Guide v1.0 Copyright © 2016 by SparkFun Electronics, Inc. Some rights reserved. The LilyPad Sewable Electronics Kit’s features, specifications, system requirements, and availability are subject to change without notice. This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons. org/licenses/by-sa/4.
INTRODUCTION Introducing the LilyPad Sewable Electronics Kit Welcome to the LilyPad Sewable Electronics Kit, designed to help you explore the world of e-sewing (electronic sewing)* through a series of introductory activities using the LilyPad system. This kit is for crafters and creatives of all ages, whether you are brand new to electronics or looking for a new way to explore building circuits. The guide begins with an introduction to basic e-sewing techniques and a simple circuit project.
INTRODUCTION What Are Sewable Electronics? Sewable electronics combine traditional craft processes (sewing, fashion design, and textile design) with electrical engineering, computer science, and hardware skills. With sewable electronics you can create e-textiles (electronic textiles), which are often wearable, flexible projects that look less like traditional electronics and more like craft and art projects.
INTRODUCTION Kit Contents The LilyPad Coin Cell Battery Holder has space for a 20mm coin cell battery and four sew tabs (two positive, two negative). A slide switch turns it on/off. Used in Projects 1, 2 All the projects in this kit are powered by 3V Coin Cell (CR2032) Batteries. The top of the battery (marked with a + sign) is positive, and the bottom is negative.
INTRODUCTION _ LilyMini + ProtoSnap 4 S 4 1 1 LEDs on Light Sensor Button 2 2 Press to change mode 3 3 The LilyMini ProtoSnap is a pre-wired circuit using a LilyMini, a LilyPad Light Sensor, LilyPad Button, and two pairs of LilyPad LEDs. The LilyMini comes preprogrammed with a set of behaviors. Used in Project 4 Conductive Thread is a specialty thread made with stainless steel fibers.
INTRODUCTION ON Of f ProtoSnap Components On Some LilyPad pieces come in a ProtoSnap configuration, which means all of the individual components – such as LEDs, battery holder, switches, buttons, etc. – are attached to one another in a single functioning circuit board. ProtoSnap boards are designed to be easily snapped apart into individual pieces when you’re ready to begin creating LilyPad projects. ! Don’t snap apart your ProtoSnap components quite yet.
LILYPAD BASICS Coin Cell Battery Holder Conductive Thread Coin Cell Battery LilyPad LED Parts of a LilyPad Circuit Sewing With Conductive Thread The projects included in this kit use conductive thread to complete electrical circuits. This section will introduce you to some basic sewing techniques as well as a few special pointers for using conductive thread to build working circuits.
LILYPAD BASICS Threading a Needle Cut a piece of conductive thread approximately 2 feet long. Push one end of the thread through the eye (opening) of the needle and pull through, leaving a tail of about 5 inches. Tying a Knot Before you begin sewing your project, you will need to tie a knot at the long end of the thread to prevent you 1 from completely pulling it through the fabric. You can tie a simple overhand or square knot. The next pages will explain a few other knot 2 methods.
LILYPAD BASICS The Starter Knot A starter knot is a method of starting your stitch with a knot directly on your fabric. 1. 2. 3. 4. 5. 6. l pul 4 ht tig ht g l ti pul 2 1 3 2 3 4 1 Repeat, making a few more loops through the fabric before trimming the loose tail.
LILYPAD BASICS The Quilter’s Knot The slightly more advanced quilter’s knot is a way to tie a quick, secure knot on the thread. After some practice, this knot can be tied very quickly. 1. 2. 3. 4. 5. 6.
LILYPAD BASICS Connecting to LilyPad Sew Tabs We’ll stitch conductive thread around LilyPad sew tabs in our circuits to connect the pieces together. It’s important that you sew tabs x4 make three to four loops each time you connect your thread around an empty sew tab and pull the thread snug with each pass. This ensures you have made a strong electrical and physical connection between the thread and the sew tab. Pull loops tight before continuing your stitch. 1. 2. ! 5.
LILYPAD BASICS Connecting LilyPad Pieces A running stitch (see page 12) will enable you to connect LilyPad components together with a single length of conductive thread. To connect two LilyPad pieces, stitch three to four loops around the sew tab and continue the stitch. Multiple LilyPad Pieces To connect more than two LilyPad pieces, instead of trimming your thread and starting over, continue stitching to the next piece, make three to four loops, and repeat as necessary.
LILYPAD BASICS Sewing Basics After sewing loops around a sew tab, a running stitch will enable you to connect LilyPad pieces together with a continuous length of conductive thread. Follow these steps: 1. 2. Push the needle through the fabric about 1/4" in the direction of your stitch path. 3. 4. Push the needle back up through the fabric another 1/4" along the stitch path. Repeat this process to travel along the path to the next LilyPad piece you want to connect to, keeping stitches evenly spaced.
LILYPAD BASICS 4 Running vs. Hidden Stitch 2 In a basic running stitch, the stitching will be even on both sides of 42 1 3 the fabric. 2 1 3 2 To hide the stitches so that they are not seen on the outside of the project, make a longer stitch on the back of the project and a very small stitch on the front of the project. This method is called a “hidden stitch.” Tip: As you sew, flip your fabric over every so often to make sure the conductive thread isn’t getting knotted or tangled.
LILYPAD BASICS Finishing Your Connection When you have completed connecting components, use a finishing knot. Thread tails can cause electrical shorts, so be sure to trim your 2 1 3 2. 4 4 1 2 4 3 1 4 1 1 4thread afterward. 3 1. 3 2 2 1 3 2 4 3 2 Finishing Knot 4 1 3 2 2 3. Repeat this finishing loop two times before cutting.
LILYPAD BASICS Checking for Conductive Thread Short Circuits Watch out for any loose threads or knot tails in your project. If any piece of the conductive thread from the positive (+) side of your circuit accidentally touches the negative (–) side, it can cause a short circuit. A short circuit connects the battery to itself and bypasses the rest of your project – and will discharge your battery almost immediately. Stitching directly over stitches in another part of the circuit can also cause a short.
LILYPAD BASICS Installing Your Battery M IU TH LI CR2 3V Y ER TT BA 032 Once all your pieces are connected with conductive thread, your finished circuit needs a power source. Install your coin cell battery, positive (+) side up, into the battery holder. ! CR2 LITH IUM 3V 032 BA TTE RY Always remove your battery when working on your circuit to avoid damaging your components.
LILYPAD BASICS Caring for Your Project Unlike copper wire, which has a coating, conductive thread is uninsulated. This means the thread behaves like bare wire and can accidentally short circuit if stray strands come in contact with each other. To avoid any accidental short circuits after the project is stitched and tested, we recommend covering the thread with a thin layer of fabric glue, fabric paint, or an additional layer of fabric.
1 GLOWING PIN Project 1: Glowing Pin 30 minutes — 1 hour Page 18
GLOWING PIN For our first project, we’ll create a wearable pin using conductive thread to connect a LilyPad LED to a battery holder. Follow along by drawing your own design on a piece of fabric, or download and print one of SparkFun’s designs.
1 GLOWING PIN ! We recommend white felt for this project so that the LED shines through the felt more easily. Planning Your Project Trace the pin template on white felt and cut out. We’ll be building our circuit on the felt piece, then adding a decorative layer of fabric with designs on top of it. Trace and cut a slightly larger circle or SparkFun design (see SparkFun.com/LilyPadSewKit) out of thin fabric (or a second piece of felt) for the top layer of the pin.
1 GLOWING PIN LILYPAD LED (COMPONENT) CURRENT FLOW + TRACES M IU TH LI CR2 032 3V Y ER TT BA - LILYPAD BATTERY HOLDER CURRENT (COMPONENT) FLOW Understanding Your Circuit This project is an example of a basic circuit – an electrical loop that travels from a power source along a path (called a trace) to a component (or components) that uses the electricity to function, and then back to the power source. For our project, we’ll use an LED (Light-Emitting Diode).
1 GLOWING PIN Understanding Your Circuit Take a look at the LED and battery holder. Notice that the silver sew tabs are labeled either positive or negative. Many electronic components have polarity, meaning electric current can only flow through them in one direction. TOP BOTTOM - + + - LITH IUM 032 3V - BA TTE RY 32 BA TTE RY 20 3V + CR CR2 LITH IUM + - If hooked up incorrectly, they either will not work or will break.
1 GLOWING PIN ON OFF Arranging Your Circuit Position the battery holder with the ON/OFF switch to the left side and the bottom two sew tabs close to the bottom edge of the felt. Use a small dot of hot glue in the center of the holder to attach it to the felt, as shown. Gluing the battery holder on this way leaves room for placing the LilyPad LED on the felt.
203 1 GLOWING PIN If you are using one of SparkFun’s pre-made designs, hold the design over the felt, and use a fabric marker or chalk to mark where the LED should be placed to shine through. Snap one LED off the LED panel. For this project only, we’ll place the LED with the lens facing the felt, allowing it to shine through to the other side. The back of the LED has a cursive L, which should be facing you.
GLOWING PIN 1 Stitching It Together 1 Cut a long piece of conductive thread, thread the needle, and tie a knot at the end. Now it’s time to connect the LED to the battery holder with the conductive thread. One line of stitching will connect the positive (+) side of the battery holder to the positive end of the LED. A second line of stitching will connect the negative (–) sides Make 3 Loops ON OFF of the boards and complete the circuit.
1 GLOWING PIN 3 Repeat the process with a new piece of thread to connect the negative side of the battery holder to the negative end of the LED. Be careful not to let the stitches touch the path used for the positive connections, as that would cause a short circuit. Trim any thread tails before testing.
GLOWING PIN ! 1 Always remove your battery when working on your circuit to avoid damaging your components. Finishing Touches Remove the battery, and then use a hot glue gun to attach your fabric design over your felt circle so the LED shines through. Draw a design on the fabric if you’d like (or see design templates at SparkFun.com/LilyPadSewKit).
2 ILLUMINATED MASK Project 2: Illuminated Mask 1—2 hours Page 28
ILLUMINATED MASK For our next project, we’ll be using multiple LEDs in a circuit to create an illuminated mask. This time, instead of stitching just one REQUIRED MATERIALS Included in This Kit: • Coin Cell Battery Holder LED to the battery holder, we’ll • 3V Coin Cell Battery use a parallel circuit to connect all • 3 LEDs (carefully snap out from panel) of the LEDs to the battery.
2 ILLUMINATED MASK Planning Your Project For this project we’ll be using the mask templates included with your kit. There are two pieces: a top layer and a bottom layer. Hold the top layer template up to your face to check for fit, and make any adjustments to the eye or nose shapes before tracing onto felt. Using a pen or marker, trace the template shapes onto the felt. Both templates will fit on one piece of felt, but feel free to mix and match colors for your design.
2 ILLUMINATED MASK Understanding Your Circuit To light up the mask, we will be connecting the LEDs to the battery holder with conductive thread using a parallel circuit layout. In a parallel circuit, components are connected to get the same amount of power running through them. Each LED in the mask will shine as brightly as the others by sharing a connection to the battery. Most of the e-textiles projects we’ll be making will use parallel circuits.
2 ILLUMINATED MASK Arranging Your Circuit Snap three LEDs off of the panel. Use the template as a guide to arrange your components on the felt, securing each piece with a dab of glue on the back to hold it in place. Double check that the (+) ends of the LEDs line up with the (+) tab of the battery holder. + + – + + Glue is hard to get a needle through and can interfere with making a strong electrical connection, so try not to get any in the sew tabs.
Stitching It Together 1 Cut a long piece of conductive thread, thread the needle, and tie a knot at the end. Sew your first connection: starting from the positive sew tab of the battery holder, connect each of the three LEDs with a running stitch and three loops of conductive thread around each positive (+) sew tab. Tie and cut. 2 excess thread. See page 14.
2 ILLUMINATED MASK 2 With a new piece of thread, repeat the process for the negative side of the circuit – connecting the three LEDs’ negative sew tabs to one another and, finally, the negative sew tab on the battery holder. Tie a finishing knot and trim any excess thread. 1 M IU TH LI CR2 3V Y ER TT BA 032 2 3 Installing Your Battery and Testing Insert the coin cell battery into the battery holder with the positive, labeled as (+), side facing up.
2 ILLUMINATED MASK Finishing Touches After you’ve checked your circuit, it’s time to get creative with adding some details to the mask. With the battery removed, glue the second layer of felt on the back of the mask to add some extra stability and insulate the back of the circuit. M IU TH LI CR2 3V Y ER TT BA 032 Next, cut small holes on either side of the mask with scissors or a hole punch and tie the elastic to hold the mask on.
2 ILLUMINATED MASK Add craft supplies such as glitter, paint, or other decorative accents to enhance or hide your LEDs and stitching. If you want to cover the battery holder on the front of the mask, feathers or big buttons can add pizzazz and hide the board. Make sure you leave an opening so you can replace the battery when necessary.
ILLUMINATED MASK 2 Page 37
3 LIGHT-UP PLUSH Project 3: Light-Up Plush 2—3 hours Page 38
LIGHT-UP PLUSH 3 ON OFF Off On Protosnap Now that we’ve experimented with lighting up multiple LEDs at once, let’s try individually controlling the LEDs. In this circuit, we’ll explore two ways of REQUIRED MATERIALS Included in This Kit: • LilyPad E-Sewing ProtoSnap • Conductive Thread controlling the flow of current to • Needle an LED using a button and switch.
3 LIGHT-UP PLUSH Planning Your Project Trace and cut out the plush template shape on a piece of felt. To hide your stitches entirely, cut out an extra half-piece of felt (as shown) to place on top of your finished plush (see page 51). ! The two halves of what will become your plush are connected at the “feet” to allow your entire circuit to be on one surface and to make stuffing the project easier. Don’t cut these two halves apart.
3 LIGHT-UP PLUSH Power Slide ON/OFF Switch Switch Push Button LEDs Working With ProtoSnap We’ll use the LilyPad pieces in the circuit to turn different LEDs on and off. Using the E-Sewing ProtoSnap, we’ll examine how buttons and switches behave differently, then snap the pieces apart and build them into a plush creature with light-up features. Before we arrange our circuit on the felt, with the battery installed, slide the battery holder switch to the ON position.
3 LIGHT-UP PLUSH Understanding Your Circuit: LilyPad Slide Switch The LilyPad Slide Switch has a small switch labeled ON/ OFF. When the toggle is moved to the ON position, the two sew tabs on the switch are connected, allowing current to flow through and close the ! The ProtoSnap battery holder also has a power switch. The slide switch push button and LEDs won’t work until that switch is set to “ON.” circuit.
LIGHT-UP PLUSH 3 Understanding Your Circuit: LilyPad Button The LilyPad Button Board is also a type of switch. When you press the button in the middle of the board, it connects the two sew tabs and allows current to flow through. When you let go of the button, the connection is opened again, and the button springs back into place. This button is an example of a momentary switch – it is only active when an action is applied.
3 LIGHT-UP PLUSH ON Of f Preparing Your Components On Carefully snap apart the connected components on the E-Sewing ProtoSnap panel. Discard the non-sewable pieces and scraps. You will end up with six LilyPad pieces: a battery holder with battery, three LEDs, a button, and a switch. Battery Holder ON F OF Switch Off On Button CR2032 LITHIUM BATTERY 3V Protosnap 3 LEDs ! Page 44 Always remove your battery when working on your circuit to avoid damaging your components.
3 LIGHT-UP PLUSH Arranging Your Circuit Arrange the pieces on the felt according to the diagram below. Make sure to check the orientation of the LilyPad LEDs before you stitch them together. The positive tabs of the LED connect to the button or switch, and the negative tabs connect to the negative tab on the battery holder. When your circuit design is finalized, use a dab of glue on the back of each component to attach them to the felt. This project has a lot of stitching.
3 LIGHT-UP PLUSH Stitching It Together 1 Cut a long piece of conductive thread, thread the needle, and tie a knot at the end. Begin sewing at the positive sew tab on the battery holder closest to the fold or “feet” on the felt cutout. Remember Of f On to use three to four loops around each tab as you sew. OFF ON Use a running stitch or hidden stitch (see page 13) to connect the positive sew tab on the battery board to the closest sew tab on the switch.
LIGHT-UP PLUSH 2 3 With a new piece of thread, connect the other side of the switch to the positive sew tabs of the top two LEDs and end with three to four loops on the closest tab of the button. Tie and cut.
3 LIGHT-UP PLUSH 3 With a new piece of thread, begin at the other side of the button and stitch three to four loops around the sew tab. Continue stitching to the positive side of the last LED, ending with three to four loops. Tie and cut.
3 LIGHT-UP PLUSH 4 Finally, we’ll stitch all the negative connections. With a new piece of thread, stitch three to four loops on the negative (–) sew tab of the first LED and connect to the negative tabs on the other LEDs, ending at the negative tab of the battery holder as shown. Make sure to loop three to four times on each connection. This is a long connection, so make sure to start with at least 2 feet of thread.
3 f Of On LIGHT-UP PLUSH ON OFF After all the stitching is complete, turn the project over. Trim any loose thread tails before testing. M IU TH LI CR2 3V Y ER TT BA 032 Installing Your Battery and Testing Insert the coin cell battery into the battery holder with the positive (labeled +) side facing up. Test the button and switch to make sure the LEDs light up. If they do, remove the battery and continue to the Finishing Touches section.
LIGHT-UP PLUSH 3 Hiding Stitches Conductive thread can be part of the visual design, or hidden. To hide stitches, add a layer of felt on top with cutouts to allow the LEDs to shine through and to access the button and switch. ! Always remove your battery when working on your circuit to avoid damaging your components.
3 LIGHT-UP PLUSH Stuffing Your Plush Once you’ve finished testing, it’s time to make the plush threedimensional. Remove the battery and fold the felt at the connected points (feet) at the bottom so the LilyPad components are on the outside. Using non-conductive sewing or embroidery thread (or a M IU TH LI CR2 3V Y ER TT BA 032 glue gun) seal all but 2 inches at the top of the plush; we will add fiberfill stuffing in this opening. Push the fiberfill stuffing into the hole to fill the plush.
3 LIGHT-UP PLUSH Finishing Touches You can now use craft supplies such as glitter, paint, or other decorative accents to enhance the plush or hide your LEDs and stitching. To protect the battery holder and battery, you can make a small flap of felt to cover the pieces and secure with velcro for easy access.
4 NIGHT-LIGHT PENNANT Project 4: Night-Light Pennant 3—4 hours Page 54
NIGHT-LIGHT PENNANT _ 4 LilyMini + ProtoSnap 4 S 4 1 1 LEDs on Light Sensor Button 2 3 3 2 Press to change mode In Project 3, we created a circuit that used a button and switch to light up LEDs; for our final project REQUIRED MATERIALS Included in This Kit: we’ll control LEDs using the • LilyMini ProtoSnap with 3V Coin Cell Battery LilyMini ProtoSnap.
4 NIGHT-LIGHT PENNANT Planning Your Project Find the pennant template in your kit. Follow along with the circuit diagram on the template or design your own layout and shape on a piece of paper. Trace onto the felt and cut. We’ll add the LilyMini and the pieces from the ProtoSnap to a customized pennant to hang on a wall or sew into a project. ! Don’t snap apart your E-Sewing ProtoSnap board quite yet. You’ll need it intact for a brief experiment first.
4 NIGHT-LIGHT PENNANT Working With ProtoSnap Like the E-Sewing ProtoSnap, the LilyMini ProtoSnap has all of its pieces wired _ together, enabling you to test the circuit’s function before you sew. The LilyMini board LilyMini has a small push button to turn it on/off, located between sew tabs 3 and 4. With the battery installed, press and release the button quickly to start up the LilyMini.
4 NIGHT-LIGHT PENNANT Understanding Your Circuit: Outputs The LilyMini is a small computer that can store information and commands to control different sensors and boards connected to it. Programmable boards like the LilyMini are called microcontrollers. The LilyMini has been programmed in advance with a set of behaviors, or code. See chart on page 57.
NIGHT-LIGHT PENNANT 4 Understanding Your Circuit: Inputs The light sensor and button are inputs – components that gather information from the world and relay it to the microcontroller. The LilyMini reads information from the inputs connected to it and makes decisions in the code based on the values it receives. The LilyMini switches modes when the button is pressed.
4 NIGHT-LIGHT PENNANT ON Of f Preparing Your Components On Carefully snap the pieces of the ProtoSnap apart. Use a set of pliers or diagonal cutters if you are having trouble snapping the pieces apart. LilyPad Light Sensor LilyMini _ + S Light Senso r 1 to cha 4 CR2032 nge m 2 2 3V 3 4 LEDs on n Press 1 LITHIU M BA TTERY Butto Lily P r o t oMini Snap 3 ode LilyPad Button LilyPad LEDs Discard the non-sewable pieces and scraps.
4 NIGHT-LIGHT PENNANT Arranging Your Circuit Arrange the pieces on the felt according to the diagram (or your own custom design), carefully securing each piece with a dab of glue. Double check the orientation of the LilyPad pieces against the diagram below before gluing.
NIGHT-LIGHT PENNANT Stitching It Together 1 We’ll begin by stitching a connection between the LilyMini and the LilyPad Light Sensor. The light sensor board has three connections: sensor (S), positive (+), and negative (–). Use conductive thread to connect Tab 1 on the LilyMini to the (S) tab on the light sensor with three loops at each tab. Don’t worry about connecting the + and – tabs; we’ll do that later. Tie and cut.
NIGHT-LIGHT PENNANT 2 4 Next we’ll connect the LilyMini to the LilyPad Button. With a new piece of thread, sew three to four loops around Tab 2 of the LilyMini, and then continue stitching to connect the 2 1 3 4 on 4 closest side of the button. Tie and cut.
4 NIGHT-LIGHT PENNANT 3 Tab 3 on the LilyMini will connect to two LEDs: A and B. With a new piece of thread, connect Tab 3 to the positive (+) of LED A. Continue stitching to connect (+) of LED B, making three 3 2 1 3 on 4 loops at each tab. Tie and cut.
4 NIGHT-LIGHT PENNANT 4 We’ll repeat this process with a new piece of thread to connect Tab 4 on the LilyMini to the positive tabs of LEDs C and D. Tie and cut.
4 NIGHT-LIGHT PENNANT 5 With a new piece of thread, stitch the positive tab of the LilyMini to the positive tab (+) of the light sensor using three to four loops on 2 1 3 on 4 each tab and a running stitch between. Tie and cut.
4 NIGHT-LIGHT PENNANT 6 Finally, we’ll stitch all the negative connections together and back to the negative tab on the LilyMini. This will require a much longer piece of thread than in other steps – about 2.5 feet. Begin at the negative (–) sew tab on the light sensor and continue stitching along the outside edge of the project, connecting to the button as shown and then to the negative tab of each piece (LEDs A, B, D, and 1 C). End at the negative (–) tab of the LilyMini. Tie and cut.
4 NIGHT-LIGHT PENNANT After all the stitching is complete, turn the project over. Trim any loose thread tails before testing. on 4 1 2 3 Press to change mode 2 2 3 3V 3 LITHIUM BATTERY 1 1 CR2032 LEDs 4 4 Prot oSna p + _ LilyMini 3V Y ER TT BA 032 Light Sensor M IU TH LI CR2 Button on S Installing Your Battery and Testing Insert the coin cell battery into the LilyMini’s battery holder with the positive (+) side facing up.
4 NIGHT-LIGHT PENNANT Finishing Touches After checking the function of the circuit, it’s time to customize your pennant. Adding light-colored felt over the LEDs can hide the boards and diffuse the light. If covering the light sensor with a felt decoration, make sure to cut a hole above the sensor so it is not blocked/covered. Always remove your battery when working on your circuit to avoid damaging your components.
TROUBLESHOOTING LilyPad Battery Holder and LEDs led only works sometimes led doesn’t turn on led is very dim check switch checkon/off on/off switch ON CR2032 check forfor l loose connections check LITHIUM BATTERY OFF 3V loose loops unravelled knots CR2032 LITHIUM BATTERY 3V CR2032 LITHIUM BATTERY 3V check for short circuits knot tail is touching overlapping stitches thread is touching another part of board stitching across a component ON CR2032 OFF LITHIUM BATTERY 3V check for rever
TROUBLESHOOTING LilyMini ProtoSnap led doesn’t turn on led only works sometimes led behavior unexpected check on/off button check on/off switch 1 LITHIUM BATTERY 2 CR2032 make sure circuit matches design 3V 3 4 1 l connections check for loose loose loops 1 32 CR20BATTERY 2 3V 3V 3 3 unravelled knots 1 4 CR2032 4 LITHIUM BATTERY UM LITHI 2 4 CR2032 LITHIUM BATTERY 2 3 3V 3 check for short circuits knot tail is touching overlapping stitches thread is touching another part o
GLOSSARY B Button – A type of switch that completes (closes) a circuit when pressed, then springs back to disconnect (open) the flow of electricity when released. C Circuit – A continuous electrical loop that travels from the positive side of a power source along a path to components that use the electricity to function and back to the negative side of the power source. Also called a closed circuit. Code – Sometimes called a “plan” or program, code is a set of instructions used by a microcontroller.
GLOSSARY M Microcontroller – A small, programmable computer built onto a circuit board. The LilyMini is an example of a microcontroller built for sewable circuits. The LilyMini in this kit is pre-programmed. N Negative (-) – The negative connection on a battery or hardware component, marked with a (–) sign. The return path for current flow in a circuit, sometimes referred to as ground. O Open Circuit – A break in the circuit that causes the flow of electricity to stop.
GLOSSARY S Sew Tab – Silver-rimmed holes on LilyPad pieces where conductive thread can be connected, sometimes called petals or pins. The silver around the hole connects to the electrical components built into each LilyPad piece. Short Circuit (“short”) – A direct, often accidental connection between power (+) and ground (–) of a power source. Electricity will flow quickly from power to ground, bypassing the rest of your circuit. A short between power and ground will drain the battery very quickly.
electronics SparkFun.
sewable electronics kit The LilyPad Sewable Electronics Kit contains everything you need to complete four projects that use electronics to make your crafts come alive with lights, buttons, switches, and even a light sensor! No soldering or previous electronics experience necessary.
