This build from Instructables userGeckoDiodehas a set five minute timer that starts beeping when the time is up.
Check out a complete list of parts and instructions at the link below
DIY Automatic Shower Timer| Instructables
Save Time and Water with This DIY Automatic Shower Timer
If you're looking to reduce the amount of time you spend in the shower, this DIY setup starts a timer automatically as soon as you close the door.If y
