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Creating a 10-15 second timer? Answered

Hi All,
Here's what I need to try and achieve:
- I have a servo that I had modified and have removed the circuit board.  Now it just runs from 3 v
- I want to reverse the servo once a momentary switch has been activated for 10-15 seconds
- once time is up the servo reverses again

I thought about using a 555 monostable circuit which would give me the amount of time, but I am unsure how to achieve everything above. I'd love not to have to use an arduino if possible.

Any ideas?

Thanks.

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ubdussamad
ubdussamad

7 years ago

YOU CAN DO IT BY SIMPLE GATE TECHNIQUE! Though it's difficult!

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ubdussamad
ubdussamad

Answer 7 years ago

the transistors are BC547 OR BC548 OR BC 557 OR 2N222A ! AND ALL THE resistors are of 10k val.

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ubdussamad
ubdussamad

Answer 7 years ago

And also you have to hold the push botton atleast for 1.5 secs the relese it .

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iceng
iceng

7 years ago

If you use a relay, pin 3 of a NE555 will reverse your motor.

Or do you want to use a semiconductor H-bridge without moving parts. ?

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