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Blinking LED


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    8e103b4f2c7680a5f2ebff0e2e644af85f4585ae

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By: kurt

Make an LED blink with this simple circuit. By using a 555 timer in astable mode, a square wave is generated. This square wave is output to the LED to turn it on and off. The LED blinks about 3 times per second with the values given in the schematic. The blinking rate can be varied by changing the resistors R1, R2, and the capacitor C1.

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Bill of Materials

This open source hardware project contains no parts.

Steps

. Insert 2k resistor

Next, insert two 1k resistors in series between the positive lead of the capacitor and pin 7 of the 555 timer. Since these two resistors are in series, their resistances add and they are equal to one 2k resistor. Alternately, you can insert a single 2k resistor instead.

P5153493

. Insert 1k resistor

Install the final 1k resistor between pin 7 of the 555 timer and the +9V rail.

P5153492

. Plug in 9V battery

Plug in the 9V battery, connect the black wire to the ground rail and the red wire to the +9V rail. Enjoy your blinking light!

P5153488

. Done!

Check back next week for another cool project.

. dummy step

another test step

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Revisions


13 - fixed a typo
12 -
11 -
10 - changed LED part
9 - added project image description.
8 - changed 9V connector part added file descriptions
7 -
6 -
5 -
4 - updated parts so they have images now.
3 - added parts
2 - deleted missing step image. added parts. updated schematic.
1 -
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