Construction

Lemon Battery

1. Distinguish the positive and negative connections of the LED using the diagram below:

1. Connect an alligator clip to each connection of the LED.
2. Firmly knead the lemons to facilitate release of lemon juice.
3. Poke two slits on each lemon, as shown below:

1. For each lemon, insert a piece of copper in one slit, and a piece of zinc in the other slit, as shown below:

1. Using alligator clips, connect the positive connection of the LED to the zinc piece in one of the lemons.
2. Use an alligator clip to connect the copper piece of that lemon to the zinc piece of a second lemon.
3. Continue to use alligator clips to connect zinc pieces to copper pieces in the lemons until there is only one unused copper piece.
4. Use an alligator clip to connect the final copper piece to the negative connection of the LED.
5. The final setup should look similar to the following:

Graphite Circuit Lightbulb

1. Use a soft-leaded pencil (e.g. 6B) to draw a graphite rectangle on a piece of paper. Softer lead works better; HB pencils give rather lacklustre results.

1. Distinguish the positive and negative connections of the LED using the diagram below:

1. Use wire leads to connect the positive connection of the LED to the positive terminal of the battery, as shown below:

1. Place the negative connection of the LED on one end of the graphite rectangle. Place a wire lead connected to the negative terminal of the battery on the other end of the graphite rectangle. The LED should light up, as shown below:

1. DO NOT directly touch the negative connection of the LED against the positive connection of the battery. This can potentially short-circuit the LED.

MaKey MaKey Circuits

1. Connect the MaKey MaKey to a computer using the USB connection. Install any necessary drivers (as detailed in the MaKey MaKey Quickstart Guide).
2. Use an alligator clip to connect an object (to be used as a key) to any one of the key slots on the MaKey MaKey.
3. Attach an alligator clip to one of the Ground slots on the MaKey MaKey.
4. Using one hand, touch the alligator clip that is attached to the Ground slot.
5. Use the other hand to touch the object to be used as a key.
6. This should trigger the appropriate key press event on the computer.
7. An example setup using a banana Spacebar key is shown below:

1. (Source: SparkFun - MaKey MaKey Quickstart Guide)