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SPI slave unwanted loopback
I have an Arduino that I'm trying to do some SPI slave communications with. My SPI code gives me loopbacks that I simply cannot explain. I think there's something about the SPI...
Wednesday, 23 March 2011 - 22:48
Disable nan [solved]
I've got a controls problem which due to extreme stiffness in normal coordinates can lead to nan showing up. The problem with nan is that it's contagious, and will eventually...
Wednesday, 8 December 2010 - 13:17
TDOA synchronization and time-stamping problem
I was thinking about a TDOA (Time Difference Of Arrival) multilateration application for indoor use. I would be trying to track multiple RF-emitting objects, with a required...
Tuesday, 16 November 2010 - 08:25
Need advice for making an ultra-large, low-res touch panel
For an artistic project, our hackerspace needs to make a very large, transparent touch panel (there will be no screen behind it). The required resolution is very low (on the order...
Monday, 8 November 2010 - 17:13
Understanding elf files
This isn't exactly an AVR question, but I suppose it's somewhat similar. I am trying to understand the elf output that Embedded Workbench makes for you when it generates the map...
Wednesday, 20 October 2010 - 16:06
Calculating 802.15.4 CRC
I'm having a devil of a time calculating the 802.15.4 CRC value. I have, for instance, the string [9 1 128 1 0 0 0 4 23 215] where the first...
Sunday, 3 October 2010 - 18:11
Determining Hall Sensor pinout
I will be teaching a quick course on using Arduinos at a Hackerspace camp this summer, and want to use some small BLDCs that I've scavenged out of CD-ROM and DVD-ROM drives. The...
Monday, 19 July 2010 - 11:25
Bitbang bitshift optimization
In order to read a magnetic encoder that has its own 18-bit message protocol (not SPI, I2C, etc...), I am using a bitshift as show below. My problem is that the below code is very...
Monday, 14 June 2010 - 19:51
Long mathematics problem
I'm pulling my hair out trying to figure this out: long a=625; b=(F_CPU * a); c=(F_CPU * a) / 2000000; d=(1410065408L) / 2000000L); e=(long)(((long)(((long)F_CPU...
Friday, 19 March 2010 - 13:57
Looking for diametrically magnetized magnet
I found this on hackaday: http://letsmakerobots.com/node/1... Pretty cool project, and I've gone ahead and bought some of the sensors. However, I can't seem to find a couple...
Wednesday, 3 March 2010 - 09:34
Looking for CAN transceiver that outputs TTL serial signals
I'm looking for a CAN transceiver that inputs/outputs completed CAN/CANbus messages as TTL serial. I've seen them for RS2323 level serial, but that's 1) too high a voltage and 2)...
Wednesday, 28 October 2009 - 08:50
WinAVR bug/oversight for XMEGA128A1
In the latest release of WinAVR, 20090313, in the file iox128a1.h, there is no prototype for CPU_t. I'm assuming this is where it should be, as in any case the typedef is called...
Friday, 23 October 2009 - 18:18

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