Picture of Flashing L.E.D. using 555 Timer
555 Circuit.jpg
I was trying to put in a video but it didn't work for me, so here is a link to YouTube http://www.youtube.com/watch?v=9rS9nFG8xdI
This is a detailed instruction showing how to build a flashing L.E.D. using 555 Timer.
There is no knowledge of electronics required in order to complete this project.
All the parts needed are listed, priced and links to them are also included. 

There are two sets of pictures, the top shows the progression of the project and the bottom shows each step individually.

This is my first instructable and it is also an assignment so please leave comments.
Thank you.

Step 1: Parts List

Here you will find a list of all required parts, their pictures, prices and where to get them.
There is also an excel file attached.

1. Breadboard
2. 9v Battery
3. Battery clip
4. Jump Wires
5. 555 Timer
6. Capacitor 1μF
7. Resistor   1k Ohm            x 2 (brown, black, red)
8. Resistor    470k Ohm            (yellow, purple, yellow)
9. L.E.D.

Time needed to finish this project: 5 - 10 min.

All the above parts can be bought at http://radionics.rs-online.com/web/ next day delivery (Ireland).
Daveatz5 days ago

Hopefully this will be of use to someone... This circuit works perfectly, only with mine the LED was really dim. I spent a long time playing around with different resistor values, even replacing R3 with a jumplead. In the end I thought I would try and work out the correct resistors the "proper" way. I put the LED on a bench PS to find out what current it was drawing, it went up to 60mA and popped, dim all the time. You've guessed by now, a faulty LED. Changed it, all works fine. I now use the circuit in a small project box connected to a 12v Pb battery as a visual reminder to disconnect the battery when I've finished playing with it. Circuit works fine at 12v with the LED drawing 1.2 mA, around 14mw.

Ecila28 23 days ago

it's not blinking </3 how can I make it blink ? without changing the materials?

what does pin 5 go to?

MichaelR510 months ago

to those posting saying they hooked it up exactly as shown and it doesn't waok: either your components are not the same or possibly you have a bad 555 IC I've made several circuits with the 555 chip over the years, both flashing (alternating) lights and audio frequencies if you used a smaller capacitor you may have hit audio frequencies. If you missed the jumpers you may have not envoked a stable mode. Without seeing exactly how you hooked it up and testing the voltage at a few points, it would be impossible to accurately troubleshoot what is wrong in each case.

hi,is there any way to make a timer delay ON??like press the switch and 4secs after turns on the led??thankss help please thanks

NelsonN21 month ago

how can i do a delay on switch with the 555timer?please i need help.

SaeedH11 month ago

i made this circuit and it works . thanks a lot .. i changed the value of capacitor and resistance so that the blinking becomes more fast its amazing .

visit my page techmess.page.tl

hazkaz made it!2 months ago

I messed around with it and when I added another led in series with R2, I got alternating blinking leds!The multimeter is measuring the frequency...changing capacitor and resistor changes frequency.

DoriNori73 months ago

It worked after I changed the 470KΩ resistor for a 10M one! :D

MiłoszG6 months ago

is it possible to run this using some small coin battery? (1,5 or 3 V)

scoma catorce8 months ago

Thank you for this one! I have a question though:

is it possible to add it more leds? or do i have to change something?

centerback201410 months ago
Thank you. This was very helpful. I'm taking Electronics in High School but we haven't gone over schematics yet (Its only the first month)But Anyway Thank You This Was Very Helpful
abhinya made it!10 months ago

Thank you Trilesto,
Am new to electronics and this was a very helpfull instructable. I just added a switch for convenience. Then replaced R1 with a potentiometer.
It worked like magic. Went birrrrrr then slowed down to dip.... dip....and so on


i made it but changed the led and resistor (for the led) to a motor that does 1.5-3.0 volts. it worked at first but then the ic overheated and didn't work anymore. i also changed the R1 and R2 to resistors to 47k and 10m ohm resistors. help please!

btw, i burnt my finger :D

@kevindiamond1015: the 555 timer integrated circuit is not designed for the higher current draw of an electric motor. To safely drive a motor, you need additional circuitry, either a power transistor, optoisolator or relay. The power transistor option is the most common. have a look at this design http://www.instructables.com/id/Drive-Servos-with-a-555-timer-IC/

ps, i think i connected it wrong. but now i have a different problem. my motor stays on. IT WILL NOT PULSE!!!! HEEEEEEEEEEEEEEEELP!

RDPearson11 months ago

I am new to electronics. This was very clear and easy to build. Thank you. Now I just need to work out how it actually works so I understand what I actually did lol :)

I followed your instructions to a T. Though some of the values on my resistors and capacitors are a little different. The light flashes but is very, very dim. When I connect to light directly to the power source the light shines good and bright. A

Any ideas why the light is so low when placed in the circuit????

neeraj56911 year ago

i do it on a general pcb but it doesn't work what should be the problem occuring there??

kdiv56501 year ago

I'm new to electronics, and I tried making this project, but the LED just stays on solid...I've ripped it apart and restarted 10 times now..what am I doing wrong?

shock1031 year ago
mine only flashes once when i remove and add the battery. please help.
colmw12 years ago
Thanks man, this helped me create something after trying to read schematics all day and nothing was working. I made something work and now I wanna learn more.
I created this circuit on a breadboard exactly as shown, but my 555 IC started heating up & the LED did not flash. What could be the issue?
Trilesto (author)  afkham_azeez2 years ago
Sorry for late respond, but if your IC is heating up it means that you have connected it the wrong way round that is + to -
very nice. I was looking for a simple schematic to make a flasher.
You can change R1 to change the frequency. 100K is fast and 900K is slow
f requency = 1440 / (R2+2R1)*C1 you can keep C1=1 and R2=1
R1 can also be replaced with a 500k variable resister
tomx633 years ago
nice job and very well done! great detail