Project : Mister for recumbent bike

My friend Eric wants to build a water mister for his recumbent bike. He would like to be able to vary the speed of misting. Manual triggering may be an issue as he has limited use of his hands. I suggested that we want to keep the system relatively compact, to make it easier to refill and take on and off the bike.

We brainstormed some ideas and came up with the following :

• Triggering : use a windshield wiper control - it already does variable speeds and allows for arbitrary delays. Most of these systems require 12V, which may be more than the motor for the mister needs, so regulation would be required. I suggested perhaps an optical sensor, but that requires extra circuitry. I suggested we start off with a simple switch and work up from there.
• Power : I suggested a rechargeable battery pack. Eric's SO Jenny suggested a generator which would require attachment to the bike. Perhaps solar? Again, I'm thinking start with a battery (like for a portable DVD player)
• Mounting : probably attach to the handlebars. If we used a bike water bottle, perhaps any existing water bottle holders could be used.
• Spray nozzle : I suggested a tube connected to a flexible stalk. If the water bottle holder was close enough to the handlebar, then everything could be attached to the water bottle