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Step 2: Using EAGLE to draw a schematicGo back to the TEAMS EAGLE Home Page or to the 16.100 Intro to ECE EAGLE Home Page Before you begin, print these files...
 The Engineering Design Process...Let's take a step back for a moment to examine the general process an engineer uses in industry. Lets assume you are given the specifications for the electronics in a new product. Your next steps would be to...
Our sample circuit...So let's use the simple circuit shown on the breadboard above and in the circuit diagram below as our prototype (here's a pdf file you may want to print). This simple circuit uses the LM555 timer chip to make red and green LED's blink on and off (about half second on and two seconds off for one of the LED's, and just the opposite for the other). I used the formulas on page of the the LM555 data sheet to select values for Ra, Rb, and C. We'll uses standard 5 mm diameter light emitting diodes (LED's) as the loads (RL), along with 360 ohm resistors in series to limit the amount of current flowing through the LED's when they are on.  Here's what you need to do...1. First take a look at the photo above to see if you can recognize the various components we'll use. Then print out this list of parts (and their associated EAGLE libraries) that you will be using to build the product. I've also attached a short video clip here so you can see it in action and to get a 3-D perspective of the parts used.
2. I created a two page summary of the EAGLE schematic layout editor that gives you step by step instructions. Read this document and use the parts list and the circuit diagram (a.k.a. schematic) below to create your first schematic in EAGLE. Be sure to label all your components (names & values) and to put your name, date, etc. on the schematic using the EAGLE text tool.
3. If you want some additional help your first time out, watch this video of the process. Caution: The As the video progresses, the audio and video get out of synch!
4. You may want to view or print my version of the finished schematic to check your work.
5. Be sure to print out your properly labeled circuit schematic and bill of materials and bring to class with you for homework credit! I show you how to create the bill of materials (BOM) in the last minute or two of the video.
Go back to the TEAMS EAGLE Home Page or to the 16.100 Intro to ECE EAGLE Home Page |