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The PPDB by Parallax is a nice tool to have for developing with the Propeller micro-controller.  I've had a couple over the past 2 years and wire most of my projects on it before placing them in a PCB for soldering.

This page contains my current, and past, projects I have made on this board starting with the most recent first.

Using the full PPDB - Version 1.4
This project requires the following:


This project is functional but still far from complete.  The current version is version 1.4 and has the following features implemented:


  • Uses the 3 x Dual 16 Segment LED Displays using the I2C Bus
  • Uses the DS1302 Real Time Clock (RTC)
  • Pressing the # and * keys on the keypad displays the Date from the RTC.


What should be in the next versions:


  • V1.5 - Update Time and Date with Keypad.
  • V1.6 - Reattach the uM-FPU V3 to the I2C Bus and test.
  • V1.7a - Attach GPS to the uM-FPU V3 and test.
  • V1.7b - Compile uM-FPU code for GPS Great Circle math, setup commands to read just a date/time/GPS String/Latitude/Longitude/Speed/Course/Altitude all separately.
  • V1.8 - Automatically update date and time according to GPS
  • V2.0 - Attach an micro-SD card reader with 4GB card and test
  • V2.?? - Micro-SD/OS related updates
  • V3.0 - Attach TV Output and test.
  • V3.?? - TV Related updates


Code for the Current Version

  V1.4 Source Code: PCA9555_17-Seg_Display_V1_4 - Archive  [Date 2011.12.02  Time 20.13].zip

  V1.3 Source Code: PCA9555_17-Seg_Display_V1_3 - Archive  [Date 2011.09.22  Time 11.37].zip

  V1.2 Source Code: PCA9555_17-Seg_Display_V1_2 - Archive  [Date 2011.09.16  Time 09.59].zip

  V1.0 Source Code: PCA9555_17-Seg_Display - Archive  [Date 2011.08.26  Time 18.45].zip


A few videos of the versions can be viewed at http://www.youtube.com/user/japreja?feature=watch


Here is the most recent Video




If you would like to discuss this project, you can do so by going to http://forums.parallax.com/showthread.php?134537-PPDB-Using-the-full-PPDB-Updated-Code-Version-1.4


Multiplexing the 17-Segment Display with Two PCA9555 ICs


See the project and get the code from http://forums.parallax.com/entry.php?309-PPDB-I2C-17-segment-display-Project-Working.  I am noticing a slight flicker in the end message, but that may just be my eyes, some people won't be able to see it as clearly as I can.  But I would like to eliminate it if I can.


Testing the PCA9555 IC



Here I am just testing the PCA9555 using code from OBEX.  Seems to work and will come in useful for my next project.