Intro to CAD: Difference between revisions

From Class Wiki
Jump to navigation Jump to search
No edit summary
Line 28: Line 28:
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/MMA8452Q.lib MMA8452Q Accelerometer EESchema library]
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/MMA8452Q.lib MMA8452Q Accelerometer EESchema library]
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/MIC5205.lib MIC5205 Voltage Regulator EESchema library]
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/MIC5205.lib MIC5205 Voltage Regulator EESchema library]
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/battery.lib Battery EESchema library]


====EESchema Checklist====
====EESchema Checklist====

Revision as of 14:01, 12 February 2014

This page is for the Intro to Engineering ENGR 122 EE/CPE Section

Two Dimensional CAD

Persistence of Vision Bike Light Project

This project will use a 3.3 volt Arduino Pro Mini clone that you will design the circuit board, housing, and software for. Persistence of vision is a psychological effect that allows you to see two dimensional images that were created by one dimensional flashing LEDs. Here are some similar projects:

We will have an MMA8452 accelerometer that communicates via a serial I2C interface. The accelerometer will measure the angular acceleration, which will allow the velocity of the bike wheel to be calculated. This will make it possible to flash LEDs at the proper time intervals to spell words, draw pictures, etc., as you ride your bike down the road at night.

The power source for your POV device can be two or three AA, or AAA batteries. You need to design the packaging. Some suggestions that you can consider are:

  • Use clear vinyl tubing and corks in the end to house the circuit board, and tie wrap it to the spokes on your bike.
  • The LEDs we purchased are 20 mA with a forward voltage drop of 2.3 volts, and there are some restrictions on the currents you can draw from the ATMEGA328P shown here.

Kicad Libraries

EESchema Checklist

  • ATMEGA328P
  • MMA8452Q
  • MIC5205
  • Do you really want an LED to tell you the device is on? (I'm guessing probably not, so make sure you didn't put one in if you don't.)
  • Batteries
  • Programming cable connector
  • LEDs
  • Are the LEDs distributed over Ports B, C and D?
  • No errors in the design check?
  • Do you have the DOC linked to the datasheet for each important part?
  • Do you have the datasheet URL in the datasheet field for each important part?
  • Does your schematic look need and tidy?