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1  Using Arduino / Microcontrollers / Re: Standalone Atmega8u2 gotchas? on: February 20, 2012, 11:24:58 pm
Have you removed the cap from the reset pin, it WILL mess the ISP programming, is MOSI connected to MOSI, MISO to MISO, CLK to CLK?
You should program at a max of 250Khz, but try slower, because the internal oscillator as some drift.
What programmer are you using?
And finally there is no Atmega8u2 available in DIP package, all USB enabled atmegas come in SMD packages, so you have either an atmega8 or an atmega88.
2  Using Arduino / Project Guidance / Re: Using print statements to troubleshoot code on: February 15, 2012, 04:58:16 pm
Use an SD card and write to that, or use a long usb cable, or use RFM12B/Xbee/Nordic NRF24 or any other wireless thingie.
3  Using Arduino / Sensors / Re: I2C hanging or something, please help! on: February 15, 2012, 11:12:29 am
Do you have propper 4.7Kohm pull-up resistors in each SDA and SCL line?
Wrong slave address?
4  Using Arduino / Motors, Mechanics, and Power / Re: Help identifying a computer PSU - non-standard HP molex? on: February 15, 2012, 11:09:29 am
Those are pretty old PSU's I guess, even the ATX PSU from my now dead P4 worked day and night without a load and it was a cheap ass 250w from china..
5  Topics / Home Automation and Networked Objects / Re: AC Phase Control on: February 15, 2012, 11:06:04 am
You need to have a zero crossing detector fedding a signal into the int0 or int1 pins of the Arduino, then inside the interrupt service routine you control a TRIAC.
See this links:
http://www.mcselec.com/index.php?option=com_content&task=view&id=89&Itemid=57

See the second image, the one that is isolated from mains via the transformer, there are more ways to do this, but this is a simple and safe one.
6  Development / Other Hardware Development / Re: New shield: Arduino Lab - Logic analyzer / Signal generator on: January 15, 2012, 10:18:52 am
So, yet another just pirate thingie?
Why do people keep re-inventing the wheel instead of improving it?
7  Using Arduino / LEDs and Multiplexing / Re: ShiftPWM support topic. Latest update: ShiftMatrixPWM needs testing on: December 08, 2011, 03:14:00 pm
Because the Serial receives data using interrupts, interrupts that are interrupting the function that is sending data to the shift-register.
8  Community / Bar Sport / Re: You know you are a tech geek when.... on: December 06, 2011, 03:10:31 pm
When you have more than 2000MIPS in micro-controllers in your room, all with some destine already defined..
9  Community / Bar Sport / Re: Arduino DUE, some thoughts on: December 06, 2011, 03:05:16 pm
Its single core, so you cant do multi tasking more real in an ARM than in an Atmega328p.
10  Community / Bar Sport / Re: Pin layout preferences on breakout boards on: November 23, 2011, 04:23:47 pm
DIP style, it as mechanical advantages and reduces the vibrations that can be induced to the PCB, so it can lower the noise floor.
11  Using Arduino / Microcontrollers / Re: Pirated Arduino Boards? on: November 09, 2011, 07:11:07 pm

Is there a PIC32 based Arduino clone?


Its called ChipKit..
12  Using Arduino / Project Guidance / Re: I have a problem, is Arduino the answer? on: October 13, 2011, 01:03:40 pm
That will be hard even for an ARM-Cortex M3, maybe an M4, but that is a job that is suited for an FPGA and external RAM, and a fast transfer to a computer, because even ram is pretty costly.
13  Using Arduino / Programming Questions / Re: How to set stepper motor speed (RPM) without using the stepper library? on: October 12, 2011, 08:13:22 pm
its just a delay between each step, so even delay() will work.
14  Using Arduino / Programming Questions / Re: How to set stepper motor speed (RPM) without using the stepper library? on: October 12, 2011, 05:29:02 pm
why dont you want to use it?
15  Using Arduino / Programming Questions / Re: Fastest way to do sin(), cos() atan2() on: October 12, 2011, 09:41:29 am
Does the Makefile used by the Arduino link the lib math that is optimized for the avr's or does it use the generic math lib that is well written in C and is very slow and heavy?
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