How to make a wiper intermittent

Discussion in 'General Electronics Chat' started by blusun, Dec 13, 2007.

  1. blusun

    Thread Starter New Member

    Dec 13, 2007

    The rear wiper on my Toyota Yaris is continuous (not sure why this is necessary). I would like to see if I could make it intermittent, presumamby by placing a 12V relay in line. Would you have any suggestions for finding such a device or any better recommendations?

    Thanks and best regards.

    Haskins, OH USA
  2. HarveyH42

    Active Member

    Jul 22, 2007
    Not sure if this is something you want to get into building... But saw one using an ATTiny13 MCU. My rear wiper is intermittent already, but pretty sure it isn't suppose to be (sometimes it works, some times just a few times...).

    Wiper delay circuits have been around for a while. I remember seeing one in Radio-Electronics back in the 70's. Should probably do a google search and see what comes up. That way you can pick one the suits your needs, skills, and budget.
  3. cheddy

    Active Member

    Oct 19, 2007
    My best guess is it is a safety feature so an inexperienced driver won't put it on the intermittent setting during a rain drizzle then forget to turn it on the continuous setting when it begins to rain harder.
  4. HarveyH42

    Active Member

    Jul 22, 2007
    I think it's continuos because it's seldom used, and only briefly.
  5. mrmeval

    Distinguished Member

    Jun 30, 2006
  6. beenthere

    Retired Moderator

    Apr 20, 2004
    We used to use a 2N2646 relaxation oscillator and a relay to make wipers intermittent. I've got a Honda Fit that picks up a lot of crud on the back window - I could use an intermittent function, too.