August 6 2010

DJHI hot swapping almost there and DJHI update

There was a slight bug found with the resistor used for the card detect pin for the Micro SD card hot swapping.
Originally a 300k resistor was used to pull down the SD_D3 data line.
It was found that this resistance is too high to use and will not allow for proper hot swap detection of the Mirco SD card.
Though some testing it was found that there is a 100k pull up resistor inside the LX that totally throws off the detection resistor value and makes it not work.
The Solution: Replace the 300K resistor (R4) with a 82.5k resistor.
All boards made from today on will feature this new update.

This is what the new resistor looks like
I am trying to figure out how to ship out resistors to those who already purchased a DJHI and would like to try to fix this.
There have also been reports of random shorts and strange behavior when the DJHI is plugged into a LX or Didj. I looked at the boards very closely and found a small routing problem that happens on some boards.

It is some times very very hard to see with the naked eye but under the microscope you can see some debris of the connector from the routing going a little too far. General use of the DJHI can cause this little flake of metal to flatten out and cause a short.
Solution: if you are experiencing random glitches and non power on issues, take a razor blade and CAREFULLY remove the debris from between the ends of the pads. As of today this will be checked for for every board built from now on.

Category: Didj, Electronics | 2 Comments on DJHI hot swapping almost there and DJHI update
August 5 2010

Adafruit’s Arduino Enclosure – 1.0 : A review

No Moogle is not selling out and getting sponsorship from Adafruit :-D I just really like this product
Arduino Enclosure – 1.0
I received my enclosure today and was reminded of my past plastic model building as a child from the smell of the case :)

This case is very well designed and should be very easy to paint and customize. It looks like a lot of thought went into the design of the lcd mount with extra space to add your own clear plastic panel to protect the lcd.
There is tons of room inside the case for any lipo battery system you could possibly want.

But there is a lack of mounting posts for an arduino pro :( just a little too short.

slight problem I found with the case is it has a weak spot when force is applied in these directions.

This should be a easy fix for the next revision of the case, just swap the flange around.
Over all though I say this case is definitely worth the $ if you are looking for a case for your arduino

Category: Arduino / AVR, Electronics | 1 Comment on Adafruit’s Arduino Enclosure – 1.0 : A review
July 30 2010

Behind the scenes

so what is moogle currently working on?
well now that you ask :)
GPS on the LX!!
it is as simple as
modprobe ftdi_sio.ko
and
stty -F /dev/ttyUSB1 raw ispeed 38400 ospeed 38400 -ignpar cs8 -cstopb then
cat /dev/ttyUSB1
and you have  the data from the FMP04 GPS module streaming to your terminal :)

now to get gpsd compiled for the LX and the real fun can begin.
the surface has only begun to be scratched !  Arduino mobile development and programming anyone?

Category: Didj, Electronics | LEAVE A COMMENT