We have been making circuits using conductive and insulating dough. This is a project from the Tinkering Studio. You can also view a TED talk about using these materials in science education.
We made our own dough.
1 cup water
1 cup flour
1/4 cup salt
3 tablespoons cream of tartar
1 tablespoon oil
Few drops of food colour
Heat it up in a pan over a medium heat stirring continuously until it forms a ball of dough. Let it cool a little then knead it.
1 cup flour
1/2 cup sugar
3 tablespoons oil
DISTILLED water (look near laundry detergents in the supermarket)
Mix the flour, sugar and oil and then add distilled water a tablespoon at a time until it forms a dough. Knead it adding a little more flour or water if needed.
Keep both types of dough in an airtight container.
To make the circuits you'll also need LEDs and batteries.
|Dough circuit (conductive - yellow, insulator green)|
You can make models with the two types of dough. You need to connect your LEDs across 2 sections of conductive dough. Use insulating dough to separate them.
Our conductive dough is yellow. The insulator is green.
If at first you don't succeed:
1) Turn your LED around, they only work in 1 direction.
2) Use more batteries; although the dough is conductive it it more resistant that an ordinary wire.
|Dough snake with LED spots|
|Dough caterpillar with LED eyes|
|Dough monster with LED eyes|