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Thread: how to automatically activate circuit after some time

  1. #1 how to automatically activate circuit after some time 
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    I have to make a robot kind of object that will go down and come up in water automatically.Therefore i need a circuit that will activate another circuit after 2.5 mins.The other circuit will contain rotors that will lift the robot up.

    Can you suggest how to make the first circuit that will activate the circuit with rotors.

    the volume of my object is around 750 cm3.So 750 gm of weight will be able to sink it(since density of water is 1gm/cubic cm). Hence, if i put 800gms of weight in it ,it will sink.I want to also ask that will my rotors have to work to lift the entire weight or just the extra 50 gms?

    It will also help if you can give further ideas.


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  3. #2 Re: how to automatically activate circuit after some time 
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    Quote Originally Posted by ak47_hardik
    I have to make a robot kind of object that will go down and come up in water automatically.Therefore i need a circuit that will activate another circuit after 2.5 mins.The other circuit will contain rotors that will lift the robot up.

    Can you suggest how to make the first circuit that will activate the circuit with rotors.

    the volume of my object is around 750 cm3.So 750 gm of weight will be able to sink it(since density of water is 1gm/cubic cm). Hence, if i put 800gms of weight in it ,it will sink.I want to also ask that will my rotors have to work to lift the entire weight or just the extra 50 gms?

    It will also help if you can give further ideas.
    how about a clock ? There are chips designed with just such circuits. Your computer could not operate without one.


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  4. #3  
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    The competition that i'm participating doesnt allow to use premade circuits,it would be nice if you could suggest a circuit . I can use the chip in the clock to make the circuit but can you suggest how will i make the circuit.
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  5. #4  
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    We tried using a 4011 NAND Gate.
    It was kinda hard to make, and we didnt work out.
    We have to look for other options , if this doesnt work.
    http://www.circuit-finder.com/catego...delay-relay-ii
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  6. #5  
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    Quote Originally Posted by foggyeyes
    We tried using a 4011 NAND Gate.
    It was kinda hard to make, and we didnt work out.
    We have to look for other options , if this doesnt work.
    http://www.circuit-finder.com/catego...delay-relay-ii
    That circuit doesn't look like it would work right. As soon as you release the pushbutton, the resistor is taken out of the circuit, and the path to charge up the capacitor is open. You would either have to hold the pushbutton closed for the entire timing cycle, or use an on-off switch instead of pushbutton.
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