I want to make my own led reaction timer, but i dont know how to make circuits, need help with them

Sorry, but I won't be designing a circuit and providing a BOM for you. This is your project, you can do the work for it.

You have an OLED display, you will need a microcontroller.
Pick one that has lots of support, and that you can interface to the OLED display.
From there it's programming, and experimentation.

Get some momentary push buttons, an assorted pack of resistors, and a Microcontroller.

 

Yes, as Gryd3 said, people won't normally just design a circuit for you because you ask! We are just people like you. We are happy to try to help, but if you ask strangers to do your work for you, you should expect them to "tell you where to go"!

You'll need a microcontroller and some hardware to interface to the pushbutton, the LED, and the display. Atmel AVRs and Microchip PICs are commonly used for this kind of application. I hope you know how to Google!

 

And does that justify you asking a bunch of strangers to do your work for you?

The least you could do is to ask nicely! And of course, tell us everything you know about what you want to do.

You will need to buy a microcontroller programmer device and learn microcontroller programming.

No one will want to help you if you don't take some initiative. Google some keywords. Get some ideas. Make an effort!

Show us that you're willing to work, and able to learn!

If you want your whole project designed and developed for you, go to freelancer.com!

 

Please keep the topic about electronics.
We will 'help' but I for one will not do your work for you.

I did not say you were being unkind, but you are asking people to do your work for you.
You need to learn the building blocks of electronics to be able to understand any circuit that may be provided to you for a reaction timer.

So, I would suggest to you that you google for some tutorials or lessons to learn electricity and some common components.
Come back with some proof that you have done research and learnt something on your own and we can begin to move forward.

Here is a lesson plan for you:
1 - Teach yourself "Ohm's Law"
2 - Teach yourself how to properly light an LED.
3 - Teach yourself how to use a momentary push button.
4 - Teach yourself how to trigger a transistor with the push button from Point 3. (Light up the LED from Point 2)
5 - Find a microcontroller you are willing to learn with. (Arduino has lots of support, AVR and PIC require additional hardware to get started)
6 - Make a couple of example programs on the microcontroller.
7 - Attempt to make the OLED display show something.
8 - Build the reaction timer!

You can ask questions about each of these points. Don't expect us to give you the answers. I wont, but I will help you to understand it if you come back after reading about the points above with questions.

 

If you "don't know how to make circuits" then all that info means absolutely nothing to you anyway. You gotta know the basics before anyone can help you out. Being there are a plenty of lessons and tutorials out there for those basics, they have helped you by advising you to do some Googling. I can say first hand that the folks here are extremely helpful when the person asking the questions is willing to learn and willing to do the work. They've helped me learn more in the last couple weeks, directly and indirectly, than I have learned about electronics in many years. Put in some efoort, learn how to make a circuit (Here's an idea, google "how to make a circuit"...Oh wait, that was already advised....hmmmm), and then go from there. The steps are laid before you. whether you take them or not is up to you, but I highly doubt anyone here will do your work, and most definitely not for free.

 

Cute.
I think we have a different understanding of the word "help".
I will help and have no problem doing so, what I won't do is offer free labour to make circuit diagrams, firmware, and walkthroughs for every idea that shows up on the forum. It's too much work!
I was trying to encourage you to teach yourself instead of giving you all the answers.
In any case, you really need to know the basics to even understand how to work with anything that may be provided on here. The research list I provided above is incredibly short and will get you your answer quickly but will also teach you along the way! The skill from what I told you to learn will help you make future projects and help you troubleshoot your timer if anything is misbehaving or not working as expected.

Oh, and FYI. The info the teacher gave you is not 'half' the answer. It's the first step.
You still need to decide what pins you want to use. If you want to debounce the button in software or hardware, and if you will be using an on-board regulator or not.
Don't forget about the LEDs. You will need to determine if you want them to be driven with transistors to allow for more/brighter LEDs, or if a lower powered LED will be fine.

A Mechanic will not write out steps for you to do your own work, why would an we?

Take care. PM me when you have learned how to light an LED with a transistor and I can help you further. Till then, I am un-following this thread.
(PS. You can ASK questions about lighting an LED with a transistor. I'm not kicking you out the door, I'm encouraging you to move forward)