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GPS Logger Hardware v4.2


I didn’t change anything with the electronic parts, but did get a new case for the data logger.  I tried long and hard but could not find a way to fit the GPS antenna inside the case.  The Molex connector goes to the  status LED and switch shown earlier.  The switch I changed from being a run/stop switch to just switching power, which allows me to get everything packaged up the night before. The usual status LEDs are inside the case, but are not visible during operation, which seems to be ok.

The board doesn’t line up with any of the mounting holes, even REV:B which I added mounting holes do not line up, I am pretty sure I can modify the board to fit these mounting holes though.  Over all this case it larger then I would like, hopefully with some other modifications I can get the size down a bit.  Putting it into this case did stabilize the device quite a bit, I had a good run which I will talk about in another post where it did not reset all day and churned out some very nice data.


No More Flying Wires!

No more flying wires!

Finished board, I don't think the date is correct should be 11/19. Least the rev code is right.

Now on REV: C finally no flying mod wires on my accelerometer / gyro board. Only the accelerometer is populated as I left off the RC filter for gyroscope, so the board is only half working. With the micro, xbee, and accelerometer it draws 57.4ma. Since the xbee claims to take 50mA, 7.4mA for micro and accelerometer seems pretty good.


GPS Logger Hardware v4.1

I’m now back to the same functionality I had on the version I built on proto boards though now much smaller. I added a run/stop switch on the side. Each transition from stop to run will result in a new file being started. Two lights on the top, the green one is lit when the uC is in a ‘RUN’ state, the red one flashes after each track point is written to the SD card.
Since the plan is to use this while skiing I used a LilyPad wearable switch and LED sewn into a glove for status and control. The LED is just a duplication of the SD write led on the case. As long as it is blinking, there should be data being written to the card. Each push of the switch will result in a new track segment started ( and the old one closed ).  I couldn’t find any of my LED LilyPad stuff so I de-soldered one of the switches and mounted a 1206 LED across the pins. The glove is connected back to the main box with a three conductor ribbon.
Hopefully will be trying this setup out tomorrow, interested to see if it actually works.


GPS Logger Hardware v4.0

After having the boards for at least a month I finally built one up.  This board dosn’t really do much new it is basically my GPS logging hardware v3.1 built onto one board.  Since I was building my own boards I opted to use a atmega1284p since I was having issues running out of sram before (though I did clear that up in software).  So there are two atmega1284p processors one to deal with the GPS and sensors, and another to talk to remote sensors as well as build and write the GPX file to the SD card. I also added an accelerometer and gyroscope to add to the data the sensor uC is collecting, I will probaly replace the atmega1284p on the sensor side with a atmega88 if the memory utilization is low enough, the 1284 seems a bit overkill for what it is doing.


GPS Logger Hardware v3.1

Bit of a delay moving on this project, mainly because an error in the board I was building to mount the SUP500f GPS to had an error which fried it. Since sparkfun stopped selling SUP500f I had to find another GPS module. I ended up not going with the recommended replacement mainly due to the odd SMT connector in the middle of the device, I have no reason to this but it just felt like that would not work very well. (more…)


GPS Logger Hardware v3


Well this is not as much a new version but moving the components off the breadboard. It has always been my intension to use the small prototyping area on the microSD shield for my first revision of the hardware. All in all it has worked out well, the shield is for the most part the exact right size, nothing is too tight, but yet it is still small enough to fit in a small box along with the LiPo battery.



GPS Logger Hardware v2

Due to some memory and timing issues with my attempt to do everything on a single processor I have split the tasks into two processors. There is one processor dedicated to parsing the info from the GPS as well as any other sensors which will be added later. The other processor takes the input from the sensor processor then builds and writes the GPX file to the microSD card.



GPS Logger Hardware v1

So my next step in my GPS logger project will be to pull the components off the breadboard and build a small prototype to gather some more real world data without needing to be so careful with it. So I figured I would take some time to describe the general layout of the current board.


© Ryan M Sutton, 2015