I like the rheostat on my Honda. I would only need a favorite wiper position if it always rains at one of my favorite rates.

I like the detent....

 

Maybe make a DC to square AC inverter. If you fine-tuned the frequency (to a fraction of a Hz) by adjusting certain component values, you could probably get it to work. This is probably a little simpler and might be good for your needs.

 

Do the wipers have a self-park facility, i.e. do they return to the park position even if they are switched off mid-wipe?

Yes

 

hi

Also...It seems like using a rheostat to adjust the wiper delay would be a little cumbersome to use.
For example, there are certain settings you might like. How will you know at what position the setting is?
You could guess...but not as easy as remembering "oh its 3 clicks". Maybe a 10 position rotary switch
would be better to adjust the delay where fully turned to the left would be the "off" position.

eT

I should think that the visual feedback from the motion of the wipers would suffice.

 

I should think that the visual feedback from the motion of the wipers would suffice.

Its up to you...

 

I designed one for Ford but had to use a microcontroller because of the complexity of all the different modes.

One thing that nearly caught us out was simply turning off the motor.
If you do that the wipers will slowly crawl up the screen.
You have short out the motor to stop it turning.