Step 1: Create an account
Step 2: Creating a breadboard circuit
From here you can:
1. Make new circuits
2. Add new components
3. Import circuits from Eagle
>> click on "New circuit"
Now you have to:
1. Name your circuit
2. Choose if it's a regular schematic or one with breadboard view and simulation
3. Select Breadboard circuit
3. Click on "Create New!"
Step 3: Editor overview
1. The views: Breadboard, Schematic, PCB, Bill Of Materials
2. The Arduino: you can upload code, and connect components to the terminals. This can also be used as a power supply.
3. The breadboard: you can place components on this.
4. The controls.
5. Tool box: take here the basic components you need.
6. You can search for the components that aren't in the toolbox.
7. Chat box for collaborative editting.
Step 4: Create your breadboard design
First delete the Arduino because we don't need it in this instructable.
Add an LED, a resistor and a button from the tool box and place it on the breadboard.
Now we want to add a power supply. Click on "Search Component", scroll down a bit and add a 9V battery. Connect everything up as can be seen in the screenshot.
We also need to set the resistor value. First we need to calculate the required resistance.
The maximal voltage over an LED is 1.7V, and the Voltage of the battery is 9V. So the Voltage over the resistor must be 7.3V. An LED uses 20mA = 0.02A when on.
R = 7.3V / 0.02A = 365Ohm
Click on the resistor and set it's value in the inspector you can see at the bottom of the screen.