Trying to help mentor some kids

Discussion in 'The Projects Forum' started by newtoallthis, Nov 20, 2008.

  1. newtoallthis

    Thread Starter New Member

    Nov 20, 2008
    6
    0
    Hi,

    I'm trying to help mentor some gcse kids and several are doing electronics,
    One wants to make a circuit for his project that automatically waters plants.

    Now I know a little bit about electronics, but not loads....I know they can't use pic chips at the school (no facilities) and reckon that it'll be an astable circuit I guess with a 555 timer with a variable resistor and capacitor to 'sort out the timing' but presumably then it should go onto a solonoid/motor to open a valve for the water device.

    Anyone got any ideas that could help.

    SOrry if I shouldn't post this...as my name suggests I am new to all this.

    Cheers
     
  2. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    If you want to get a bit trickier than just a 555 timer and a solenoid, there are linear flow controllers available too. It's a good chance for your kids to get their feet wet (or at least their plants wet) with op-amps and such.

    eric
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    Here is a small circuit for a plant watering watcher.
    http://www.redcircuits.com/Page18.htm
    Parallel to R7 and the led there can be a smal relais to control the pump.

    Greetings,
    Bertus
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
  5. newtoallthis

    Thread Starter New Member

    Nov 20, 2008
    6
    0
    Thanks for your all help guys! much appreciated:)
     
  6. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    I would also like to thank you for investing your time in getting kids to be enthusiatic about science in general and electronics specifically. Who knows how many of the kids in your group will go on to greater things.

    hgmjr
     
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