RC timer

Discussion in 'The Projects Forum' started by pvgun, Dec 14, 2009.

  1. pvgun

    Thread Starter New Member

    Dec 14, 2009
    I need some help biulding a RC timer circuit which will go high for certain number of mins (10mins) every 5 days with out using a 555. I need it to be low power circuit.

    if anyone could help me it would be great.
  2. SgtWookie


    Jul 17, 2007
    Sounds like you could use a microcontroller for that.

    Many of them will run on 2.5v-5.5v.
    Many of them have a "sleep" mode, where they use very little power. They can be programmed to "wake up" every so often to perform a task.

    But, why don't you tell us more about your power requirements.
    What do you want to use for powering this timer?
    What will it be controlling? Voltage, AC or DC, what power level?
  3. pvgun

    Thread Starter New Member

    Dec 14, 2009
    im using a sms unit which is connected to 4 inputs and sends a sms when the input is triggered however the device will be located at the bottom of pit and there is no way of knowing if its still running. so i thought i will connect a timer to one of the inputs that will trigger every week so i know its still in operation. The device runs on a 12V DC supply and will be located in the pit for a year or two thats why i need a simply and low power soltuion.
    I was thinking of having a RC circuit connected to a transistor but not sure how to build construct it. any ideas
    The device is very flexible can handle any input voltage varying from 5 to 20V.
    Last edited: Dec 14, 2009