Ok, D-Day. Time to dig up my Press-n-Peel PCB transfer film and Ferric Chloride.

In the mean time I added a jumper to the circuit design so I can disable the buzzer if it became too annoying.

In Part One of this project I developed a test circuit that proved that it would all work. In Part II, I actually redesign the bread boarded prototype into the final product.

After the near mishap with the last GPS bush walk, I have pondered how I was going to monitor the battery power usage. This blog is my first go at it.

The next day I set out to map some of the roads and tracks around a patch of Bush that I have been frequenting for a few years - recording native Orchid growth etc.

Here is the voltage recordings of the battery:

11:30 13.25V (No load)

11:32 12.63V (PC On)

14:45 strong electrical burning smell noted!

14:50 9.8V (No Load)

Ok, time to go for a walk and a drive...

I checked out my last lot of GPS code from the SWASC subversion repository and uploaded it to the MARK I mini-ITX PC. I then went for a walk around the park at the back of the house. The PC and GPS where running from a common 12V 7A Sealed Lead Acid (SLA), battery. The first walk lasted 1 hour 40 minutes. I noted the voltage drop over this period:

13:40 12.28V (on load)

14:00 12.14V

14:40 11.96V

15:00 11.88V

15:05 12.00V (no load)

Layout of the PCB board. Main connection to the Compass board is via J1 a RJ-45 socket.

schematic diagram of the Power Distribution board

Back in March 2006, I went to run the PC for something, and realised that it would be really handy to have a power distribution board. This would allow me to quickly unplug all the different modules.

This is what I came up with. It's still not built, as I will make the PIXAXE-28 controller board at the same time, since this one is pretty small.

Here is the schematic diagram of the board:

Here is the PCB board layout:

Well, it's been a while, but the SWASC wheels (propeller?) are still turning.

This afternoon I have been discovering how to use a Freeware GIS mapping program called MapWindows. At the moment, it pretty well does all that I need a GIS program to do.

MapWindows in action