urgent circuit required

[Syed Aameer]

hi i am aameer.

can u please help me to design a circuit to trip the 12v relay after 10 sec.it should be done automatically. i need this for my diesel bullet.when i turn off the key the relay should supply power from battery for 10 sec then it should b turn off. now i m switch off the bullet by pulling the wires.

[dagakshay]

hello aameer nice project….

 

sir i dont know how the key works in automobiles… i mean i don’t know the electrical concepts in that… i can give a simple ckt when you press the key the LED will glow and as soon you  release it the LED will be off after 10 second… if you can explain me the concepts of your bike i will be surly ready to do work with complete dedication on this project….

 

here i the simple ckt…

 

wysiwyg_imageupload:826:

 

[dagakshay]

code algo:

 

 

while(1)

{

 if(key= = 1)

 {

  led=ON;

   while(PA0= =1);

   _delay_10s( );

  led=OFF;

  }

  else

   key=off;

}

 

 

this the code algo for the above ckt….

 

there can be more simple circuits by using 555 for that….

 

[Syed Aameer]

i dont want to use microcontroller..

 when the key is pressed the LED should be on for 10 sec/20 sec then it should be off though key is pressed.

input voltage is 12v.

i know i can control through programming using microcontroller but to save the cost i want todesign using timers/any other component.

[dagakshay]

use 555 mono stable mode it will do that job

[sathyamoorthy]

what he said is correct .I can tell you what to do.You can use the 555 in Monostable mode.But what happen is you cant control the input after 10 seconds.I know this circuit which i have already designed in IIT .This is simple only.

 

 

 

If you want i can build in the SPCIE and i can send it to your mail id

 

[AJISH ALFRED]

 

Hi Ameer,

Use the 555 as a monoshot. Its simple. Download the datasheet of the 555, and there will be the monoshot circuit given as an application circuit example. There will be an equation relating the time period required and the value of capacitor and resistor. Set your circuit according to that equation. You can try first in a bread board and later built it using a general purpose pcb.

[Amrith]

Hi Ameer,

Here is the circuit you are looking for..

t=0.69RCwysiwyg_imageupload:5317:

All the best…

 

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