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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 555 timer

Put the 555 timer IC in the middle of the board at the top. Make sure that the notch/dimple is at the top of the chip when you put it in the breadboard.

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. Add wires

Place jumper wires as shown. The left rail will be used for ground, and the right rail will be +5V. Next, we will insert the 100uF capacitor.

Missing P5153499

. Insert capacitor

Step 2: Insert the 100uF capacitor as shown. The positive lead should connect to the orange and purple wires on the right. The negative lead is marked by the white stripe going up the side of the case. It connects to the orange wire in the bottom left.

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. Insert LED

Insert the LED. The longer lead is the positive lead. It will be connected to the 680 ohm resistor in the next step. The negative lead connects to pin 3 of the 555 timer.

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. Insert 680 ohm resistor

Insert the 680 ohm resistor as shown. It connects the positive lead of the resistor to the white and green wires. This resistor limits the current that flows through the LED since LEDs act like short circuits when they are forward biased.

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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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