Post Created date
DIY bicycle computeer
It was just for me. Documenting it enough for someone else to be able to make it would be way too much work. The motivation was that I had a feature you could not buy which was...
Monday, 3 October 2011 - 11:44
DIY bicycle computeer
70+ source files with no formal documentation would take some working through. No problem releasing most of it but the Ant+ stuff I had to sign a fairly restrictive NDA for so I...
Sunday, 2 October 2011 - 13:45
DIY bicycle computeer
Cool, I have done a couple of Bike computer projects but never had the inclination to write them up. The second version had Ant, gps and data loging it was xmega based. I have...
Friday, 30 September 2011 - 14:29
XMEGA use DMA to write directly to SD card. help!
I looked into doing this but the SPI can only act as a dma trigger in slave mode not master mode. This means you can not do dma to the sd card in any simple way. Aparently the...
Saturday, 28 May 2011 - 19:48
making bike speedometer
Good work getting things going. My first version used just buttons for controll but version 2 has moved to rotory encoder as well as two buttons which makes changing parameters a...
Friday, 21 January 2011 - 20:59
making bike speedometer
I missed this earlier. I have a homemade bike computer with read switches for wheel and crank inputs. I basicaly run a 1024Hz timer in the interupt routine I increment 16 bit...
Sunday, 26 December 2010 - 17:28
Different behaviour caused by breakpoints?
To test if it is just timing put a delay in where you have the breakpoint and see what happens....
Wednesday, 27 October 2010 - 17:12
Need help with SparkFun Graphic LCD Serial Backpack!
I have the 128_64 lcd pre assembeled with the backpack. I don't remember any trouble with getting it to at least display somthing straight out of the box. As has been said the...
Friday, 9 July 2010 - 14:18
[TUT][SOFT] SD/MMC with FAT from A to Z
disk_initialize() will get called as apropriate when you do somthing that realy needs to access the card you do not need to do it yourself. FILINFO.fsize will get filled in when...
Saturday, 29 May 2010 - 20:44
Differences between ATMega1284p and ATMega644p?
I think this sounds like a bug that the slight change in timing is showing up. I think you should be checking for volatile and atomic usage.
Saturday, 29 May 2010 - 14:00
meassure height (0-2 meter) / barometric sensor?
Sparkfun have a SCP1000 which claims to be good to 9cm but in practice I would say you would be good to get 50cm reliably. I use it on my bike computer and am happy with 1m...
Thursday, 25 March 2010 - 16:39
Xmega FatFS SD Initialization Problems
I have this sort of setup working. Looking at my code I have it set for Mode 3 but the code I was converting from (ATmega664) was mode 0. I don't remember changing it and have...
Monday, 15 March 2010 - 10:16