Make a Laser Ball

Laser Ball Specifications:

• Total optical power: ~70mW
• Current draw (max): ~300mA
• Operating voltage: 3.3V
• Battery life: ~2.5hrs (but its rechargeable!)

Steps and Timeline:

• 1.00 hr - Preparing and gathering materials/tools
• 0.25 hr - Thinking through the design
• 0.50 hr - Preparing the Teensy
• 0.75 hr - Cutting and installing diffraction gratings
• 0.50 hr - Drilling the tennis ball
• 0.50 hr - Installing lasers
• 1.00 hr - Soldering lasers, Teensy, and JST connector
• 0.50 hr - Squeezing components into tennis ball

Total time:

• 5.00 hrs

Materials:

• $42 - Red lasers (14) (Buy from Aixiz) (Buy from DealExtreme)
• $9 - Battery (Buy Li-Ion batteries from Sparkfun)
• $16 - Teensy microcontroller (Buy from PRJC)
• $5 - IR remote (Buy from Adafruit)
• $2 - IR receiver (Buy from Adafruit)
• $2 - Diffraction Grating (Buy from Edmund Scientific) (Buy from Ebay)
• $1 - JST connector (Buy from Sparkfun)
• $1 - Tennis Ball (your closet...)

Total cost:

• $78

Tools:

• Soldering iron
• Dremel
• Wire strippers/cutters
• Hobby knife
• Masking tape
• Marker
• Scissors
• Tweezers/Forceps
• Helping-hands/alligator clips

Link: http://www.instructables.com/id/Laser-Ball/?ALLSTEPS