Simple Question - Timed off

[sanctuary]

Hi,
For a science project, I need to make a circuit that starts, and then automatically turns off the (DC) motor after a certain amount of time. I did a little research and found that a 555 timer is what I need, but I really am confused about how I would set it up for any given time length.

 

[bananasiong]

Is this similar?
https://www.electro-tech-online.com/threads/power-on-delay-circuit.30285/

 

[sanctuary]

Not quite. It seems like that design involves the motor turning on after a certain amount of time, I want the motor to already be on, and turn off after a certain amount of time (maybe 5-30 secs)

 

[Norlin]

I didn't look at the link, but perhaps you could invert the output of the circuit that was linked? Therefor initially it'll be on and then turn off after a certain amount of time?

 

[Roff]

Hi,
For a science project, I need to make a circuit that starts, and then automatically turns off the (DC) motor after a certain amount of time. I did a little research and found that a 555 timer is what I need, but I really am confused about how I would set it up for any given time length.

Do you want to start the timer with a switch, or...?

 

[Hero999]

The circuit is on the datasheet!

It's called a monostable and Google knows the answer.

https://www.google.com/search?num=100&hl=en&client=opera&rls=en&hs=ArI&q=555+monostable&btnG=Search

 

[Gayan Soyza]

Here is a circuit,Caclulate the R and C according to your required time.

**broken link removed**

For driving motors you requre some adequate transistors for the output.

Here is the original link

https://www.eleinmec.com/article.asp?4