DIY LED Light Drawing Pens

Materials:

• Plastic Tubing – 5/8″ outside diameter – 1/2″ inside diameter
• Plastic Tubing – 1/2″ outside diameter – 3/8″ inside diameter
• 1 LED
• 1 Normally Open Switch
• 1 20 ohm Resistor – size is determined using Ohm’s law
• 3 1.5 volt Button Batteries
• Heat shrink tubing
• 24 gauge wire
• Electrician’s tape

References from: Handimania