You will need(pretty much all of the materials in the above instructable plus a couple more alligator clips and my second program):
A makey makey
Four 2 foot long alligator clips(should be included with the makey makey kit)
A bath tub
Less than 2 feet of duct tape
A zip lock bag(or you can destroy the anti-static bag in the kit)
Submitted by Montana Ethical Hackers for the Instructables Sponsorship Program!
Step 1: Align the Alligator Clips, Install the Splash Shield, Wire the Makey Makey
Ready? Okay! Let's make this into a shower timer as well!
Step 2: Add Two More Alligator Clips.
Download my Shower Timer program from this page. Unzip it and open it in a browser. Set the time you want your shower to last. Keep the window active and in the foreground while you take your shower.
You can reset the timer with the "Reset" button and you can test the timer with the space bar!
Happy showering! I'm going to take a shower and go to bed.
UPDATE: I fixed the timer so it's easier for people to use. It counts down in big minutes and seconds now and it works in all browsers... even in older versions of IE.