Usb Powered Blinking Led

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Introduction: Usb Powered Blinking Led

i will show you how to make a led blink and use a usb port of the computer as a power source.

Step 1: Materials

What you will need:
1] 555 timer
2] 1k ohm resistor x2
3] 100 ohm resistor
4] led{any color i used a green}
5] capacitor [depending on the blinking rate. see next step}
6] circuit board
7] usb male connector
8] 555 timer holder {whatever it is called}

Step 2: The Capacitor



you can use any capacitor in the range of 10uf  to 1000uf depending upon the blinking speed.
if you take a capacitor of less value will blink the led faster.
if you take a capacitor of more value will blink the led slower.
i used a 100 uf capacitor.

Step 3: Solder the Circuit

here is the circuit digram . solder the the circuit according to the digram.

Step 4: Connect the Usb Connector

we will need only the red and black wire.
my connector had red and a blue wire.
connect the red wire to the positive terminal of the blinking circuit.
connect the black wire to the negative terminal of the blinking circuit.

Step 5: All Done

if you like the instructable follow and plz rate and please please vote for the 3rd epilog challenge
 my e-mail id is rohit1398@gmail.com

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11 Comments

Do you have to program the 555 Timer Chip?

its called an electrolytic capacitor, not electrolyte

wats kept in the spelling??/

uhg first off you dont make sense and I see this is a totally lost cause.

I like this design! it's cool to be able to make something out of with electrical components that works with a computer!

If you like 555 timers, check out this 555 timer calculator.


A Few Questions:
How much current does this thing draw?
Are you using a schematic program? if yes, which one?

it draws about 20-25 mv
i did not use any schematic program.
i used paint to draw the schematic.

thanks for the software.