Intro to CAD: Difference between revisions

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* Do you have pull up resistors on the I2C bus lines SCL, SDA, and SA0?
* Do you have pull up resistors on the I2C bus lines SCL, SDA, and SA0?
====Example Schematics & Footprints====
====Example Schematics & Footprints====
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/POV_Light.svg This is an example schematic.] It has provision using jumper K1 to select three batteries and a voltage regulator, or two batteries without a regulator.
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/POV_Light_4.svg This is an example schematic.] It has provision using jumper K1 and P3 to select two three batteries and a voltage regulator, or two batteries without a regulator. You don't need to do this. I am doing it, so I can have a board that will be either way for debugging possible issues. I recommend picking one or the other power supply method.
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/CVPCB.png Example Footprint Selection] You need to select the POVLib.pretty in the Preferences->Library Tables in CVPCB in order to find the special footprints.
* [http://people.wallawalla.edu/~Rob.Frohne/ClassHandouts/Intro_to_Cad/CVPCB.png Example Footprint Selection] You need to select the POVLib.pretty in the Preferences->Library Tables in CVPCB in order to find the special footprints.



Revision as of 12:28, 18 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:

Kicad Libraries

Footprints for CVPCB and PCBNew

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?
  • Do you have pull up resistors on the I2C bus lines SCL, SDA, and SA0?

Example Schematics & Footprints

  • This is an example schematic. It has provision using jumper K1 and P3 to select two three batteries and a voltage regulator, or two batteries without a regulator. You don't need to do this. I am doing it, so I can have a board that will be either way for debugging possible issues. I recommend picking one or the other power supply method.
  • Example Footprint Selection You need to select the POVLib.pretty in the Preferences->Library Tables in CVPCB in order to find the special footprints.

Parts Ordered By Ralph

This is Ralph's parts order.

Kicad Videos and Other Information

Engineering_Electronics