Timer to Control 12V DC motor

Discussion in 'The Projects Forum' started by gregade, Sep 22, 2013.

  1. gregade

    Thread Starter New Member

    Sep 22, 2013
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    0
    Hello, Please help me with a simple programmed circuit to control on and off of a 12V dc motor.

    the ON time to be 1min and
    the OFF time to be 6hrs (360mins)

    the idea is that the circuit will turn on the motor for just 1minute and it will be in off position for the next 360mins (6hrs) before it is switched on again for 1minute and this will continue unless it is switched off.

    please, I need this circuit as very urgent as it is the only thing remaining for me to complete my final year project. I will very grateful to find help here.

    thanks.
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,526
    2,369
    Looks like you need an application using a real time clock, such as incorporating a 32Khz watch crystal.
    It could be done simply with a small PIC micro but I don't know whether you want to get into that much detail?
    Max.
     
  3. #12

    Expert

    Nov 30, 2010
    16,278
    6,790
    This might work if you set the clock to about 2/3 of a second.
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    How about a plug in wall timer driving a 115VAC coil relay to control the motor. I think the digital ones will allow cycle times of 1 minute. Or use a mechanical one (15 minute minimum cycle time) driving a relay that powers a 1-minute 555 monostable that controls (directly or through a transistor or relay) the motor.

    Ken
     
    Last edited: Sep 22, 2013
  5. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    Timer relays are available on eBay for reasonable price
     
  6. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Timer....McMaster-Carr 7993K73 $19.34
    Relay....McMaster-Carr 7098K12 $11.84
    Don't know where you are but for me, if I order by 3PM I have it by 11AM the next day for ~$5 ground shipping
    You may have other sources for the timer, like hardware stores. If this is an academic institution, ask around for a 120VAC relay.
    Ken
     
  7. gregade

    Thread Starter New Member

    Sep 22, 2013
    2
    0
    thank you all, you are all wonderful. I have this idea but I don't know if it can work.
    I am thinking of connecting the output of an astable multivibrator(360minutes) to the input of a monostable multivibrator. then the output of the monostable(1minute) to the relay to switch on the motor. please, can that work?
     
  8. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    230
    A 360 minute astable is not practical. You need a faster astable and a divider, then drive your 1 minute monostable. A CD4060 circuit will work for the 6 hour cycle:http://www.zen22142.zen.co.uk/ronj/24h.html

    Ken
     
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