Module 01

Schematic Design

Learn to design the circuit for a 555 LED Chaser. We'll be using EasyEDA Standard Edition.

Step 1

Creating your project

Go to easyeda.com/editor and click Design Online > STD edition. We are using the standard edition for simplicity.

Once the editor loads, click File > New > Project. Name your project (e.g., "555_Chaser") and click Save.

Step 2

The Component Library

In order to place components, click Library on the left sidebar and search for these specific part numbers. Click "Place" for each one:

Part Code Component Description
CD4017BCNMain CD4017 IC
C46749555 Timer IC
C492401Power Header (VCC/GND)
C81276Debug Header
C62934Electrolytic Capacitor (Directional!)
C249157Ceramic Capacitor
C7139971k ohm Resistor
C58592470 ohm Resistor
C118912Potentiometer (Speed Control)
C2895480Normal LED (Place 10)
Step 3

Placement & Arrangement

Now that you have placed all of your components, arrange them approximately as shown below. This will make it much easier when you wire the circuit.

Placement Guide
Suggested arrangement of ICs and discrete components.
  • Use 'R' to rotate components.
  • Use Copy/Paste to create the 10 LEDs quickly.
  • Remember to Save (Ctrl+S) often!
Step 4

Wiring everything together

Connect your components following the diagram below. The little red dots indicate that two wires are connected. If wires cross without a dot, they are not connected.

Schematic Diagram
The complete 555 + 4017 Schematic.
Pro Tip: Press 'W' to activate the wire tool. Wire together the Ground (GND) of all 10 LEDs first!
Wiring Detail
Detail of the wiring logic.

Finished your schematic?

Design the PCB →
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