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crazy waveforms
I'm having frustrations that make me want to quit.  I am working on a project to interface a Playstation 2 PS2 controller using SPI.  Again, seven years later, I'm...
Tue. Jan 31, 2017 - 04:42 AM
building Marlin 3D printer in Atmel Studio?
I've been unsuccessful looking for a reference describing how to build the Marlin 3D printer firmware in Atmel Studio.  It seems to be very deeply Arduino-based, and the...
Sat. Jan 7, 2017 - 04:22 PM
ATtin84A INT0 sense control problem
According to page 50 of the datasheet Table 9-2, there are four combinations of ISC01 and ISC00 that affect how the INT0 interrupt fires.  I was unable to get rising edge...
Mon. Nov 21, 2016 - 06:14 AM
Trouble registering and downloading Studio 6?
The question: Is anyone else having trouble acquiring this software? I've been away for a while and upon returning to AVR development, thought I'd update my toolset from 4.x. I'...
Mon. Nov 12, 2012 - 02:31 PM
discrete stepper motor driver
I scavenged a small stepper motor from a broken scanner and would like, as a matter of learning and discovery, to create a simple discrete-component driver for it. My searching...
Sun. Feb 5, 2012 - 02:56 PM
general question about interfacing
I'm working on a design with an ATmega644 driving numerous 4511 7-segment decoders in a multiplexed fashion. In general, is it a good design practice to put resistors on interface...
Sun. Oct 10, 2010 - 04:14 PM
object tracking with image sensor + FPGA?
Hi all, I'd like to make a robotic vision subsystem that behaves similar to this: http://www.youtube.com/watch?v=tbHWvPWhVh8 I can envision an image sensor filling a SRAM or...
Wed. May 26, 2010 - 03:21 AM
difficult bit-twiddling problem
Hi all, I'm having trouble with something that I feel must be easy, but it's confounding me. I want to clear certain bits of a port without touching others, and without setting a...
Thu. May 20, 2010 - 02:54 AM
floats, libs and includes
I have a project that makes extensive use of floating point values, and it works, albeit SLOWLY, with no libraries linked in and headers as follows: #include #include #include...
Sat. Apr 3, 2010 - 08:01 PM
real-time and state machine reference?
I'm wondering if anyone can recommend a website or printed text the treats the subject of real-time systems and state machine programming in some detail. A reference that uses C...
Sat. Apr 3, 2010 - 07:33 PM
At wits' end with multi-byte SPI transfer
Fellow 'Freaks, I'm at my wits' end trying to get multi-byte SPI transmissions to work. I have an AVR SPI master sending a buffer (a union of some data and uint8_t[]) to the...
Sun. Mar 21, 2010 - 06:26 AM
multiple SPI slaves?
In my project, I have one SPI master and several slaves. All but one of the slaves are AVRs; the remaining one is a Playstation PS2 controller. I'd been working on getting two...
Tue. Mar 16, 2010 - 04:42 AM

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