Paper Circut

This project uses copper conductive tape and a coin cell battery to make this light-up card!

Since this project also uses coin cell batteries, it isn't necessary to use a resistor, because they have a higher internal resistance than other types batteries usually do. But although it is a simple project, it is important to be careful when handling and storing small coin cell batteries and keep them away from young children and pets, as it can be a hazard if swallowed.

Feel free to customize it using different colors (or numbers) of LEDs, and experimenting with different designs!

Some other design ideas include:

1. flowers with an LED in the center
2. Light up animal eyes
3. light up cake candle (great for birthday cards!)
4. glowing fireflies!

Circuit:

1. 1x LED
2. 1x 3v coin cell battery
3. conductive copper tape

Decoration:

1. paper
2. colored pencils/markers for decoration
3. tape
4. scissors

Fold your paper in half. Inside, at the bottom, trace the outline of the battery. From there, tape a strip of copper tape.

Connect the negative (shorter) leg of the LED to left side of the circuit using copper tape. Connect the positive (longer) leg of the LED to the other side.

Fold the corner of the paper, so that it overlaps with the outline of the battery. Using the copper tape, extend your circuit and add another strip on the fold.

Tape your battery onto the circle, with the negative end going on the bottom and the positive end on the top. Now, when you fold the flap, the circuit completes and the LED lights up.

On the outside flap of your paper, make a small hole to insert the LED. Optionally, add an indicator for where to press the circuit.

Decorate the paper using colored pencils or markers. Try lighting up your circuit!