The beautiful simplicity of using LEDs to produce a spark of light inspired us to make these “cards”. This is a great “wiring 101” project because it introduces kids to the workings of a circuit and teaches them to assemble one without stripping wires, adding switches, or worrying about being shocked. Once they understand the connections, they can effortlessly make tons of cards.
LEDs (You can scavenge LED from a string of holiday lights or order a container for $4.95 from the Electronic Goldmine)
Wire (We use 26-gauge florist wire) from any craft store or florist. You just need 18”
Paper Fastener (from the office supply store)
3V Battery (coin battery)
A sheet of cardstock to fold into a card
Other colored paper, markers, glue, scissors, etc, to design the card
Ages: 6+ with grown-up supervision and help.
Time: 30 minutes
When executing this project, it is important to follow the steps and test your circuit as you go.
1. Plan and make a layout of your design with light pencil strokes, before you get started. Fold the cardstock in half to make a card. At some point, you will have to cut out some portion of the front section of the card, so ensure to factor this into your design. We used cut paper to create the elements of our picture; we created these first so we could plan the layout, and then we set them to the side.
2. Plan out your circuit. The paper fastener will need to punch through the front of the card, and the battery must be affixed (negative side up) to the back of the card. When the card is closed, the button of the paper fastener should meet the (negative) face of the battery. The LED should show from the front when the card is closed; the battery should be hidden.
3. Once you’ve sketched the placement for your paper fastener, battery, and LED, draw the path of the wires. One wire should connect the paper fastener to the cathode leg of the LED. Another wire should connect the anode leg of the LED with the positive side of the battery (the end of this wire will be sandwiched between the back of the card and the battery). To identify the anode and cathode legs, take a close look at your LED. The anode leg is slightly longer and the little flag at the top (inside the plastic ‘bulb’ section) is smaller. The cathode leg is shorter, and the little flag at the top is larger.
4. Now start taping your circuit components into place. You can also use masking tape to make sure your wires don’t cross. Tip: Just tape the battery around the edges; don’t cover the whole thing otherwise, you will lose the connection between the battery and the paper fastener. Also, you can bend the legs of the LEDs away from each other as this will make it easier to wrap the wire around them.
5. When everything is taped down, test your circuit! Close the card; when you down on the paper fastener (so that it touches the battery) does the LED light up? If it doesn’t light up, troubleshoot. Make sure your connections are secure at each point, check to see if the wires are not touching and that the positive side of the battery is pressing down firmly against the wire leading from the anode leg of the LED.
Now, finish your design! Draw or glue in the rest of your picture. You can cover the wires with another piece of paper if you don’t want them to show, but make sure to punch a small hole where the LED will stick through. Make sure to add a little note or circle on the front to let people know where to press to light up your card!
Learn more fantastic DIY projects like this on our blog!
Curious Jane, founded by contributor Samantha Razook Murphy, offers project-based after-school programs and summer camps, revolving around creativity in the arts and sciences.
POSTED IN: KID DIY · TAGGED: CIRCUIT CARDS, EASY KIDS’ CRAFT, INDOOR ACTIVITIES, MORE AMBITIOUS CRAFT