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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...
Wed. Mar 23, 2011 - 10:48 PM
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...
Wed. Dec 8, 2010 - 01:17 PM
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...
Tue. Nov 16, 2010 - 08:25 AM
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...
Mon. Nov 8, 2010 - 05:13 PM
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...
Wed. Oct 20, 2010 - 04:06 PM
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...
Sun. Oct 3, 2010 - 06:11 PM
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...
Mon. Jul 19, 2010 - 11:25 AM
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...
Mon. Jun 14, 2010 - 07:51 PM
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...
Fri. Mar 19, 2010 - 01:57 PM
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...
Wed. Mar 3, 2010 - 09:34 AM
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)...
Wed. Oct 28, 2009 - 08:50 AM
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...
Fri. Oct 23, 2009 - 06:18 PM

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