Comments for Ruben's blogRuben's blog -

Comment on Arduino tilt sensor using MMA7260Q accelerometer by Rubén Laguna

Rubén Laguna — Thu, 04 Mar 2010 16:48:15 +0000

If I recall correctly, I divide by 0.8 to normalize the value (the MMA7260Q output is 800mV/g).

Comment on Arduino tilt sensor using MMA7260Q accelerometer by Rohit Banerjee

Rohit Banerjee — Thu, 04 Mar 2010 15:54:06 +0000

Hello,

I was just wondering why when you are converting from a float to an int, you do an effective divide by 0.8. Why don’t you do just *= 3.3/1024 ?

Thanks

Comment on bash: clear: command not found by gini

gini — Mon, 22 Feb 2010 21:46:43 +0000

I verified through cygcheck that I have the ncurses installed yet I cannot use any of the cleartool/clearmake of other commands of clearcase…. any suggestions?

Comment on Arduino library for MMA7260Q (Tilt Sensor) by ruben.laguna

ruben.laguna — Wed, 17 Feb 2010 17:10:39 +0000

I never used Processing myself, but according to the example that I found here http://arduino.cc/en/Tutorial/VirtualColorMixer it looks that it’s a matter of reading from Processing what Arduino prints in the serial line. The example shown in this pages prints something like…

rho: 71.137 phi: -1.060 theta: -71.169
minx: 407.0 miny: 434.0 minz: 739.0
maxx: 524.0 maxy: 510.0 maxz: 814.0

in the serial line. In processing you have to parse this output (look at serialEvent method in http://arduino.cc/en/Tutorial/VirtualColorMixer). Look at the arduino< ->Processing examples at http://www.arduino.cc/en/Tutorial/HomePage under Communication.

Comment on Arduino library for MMA7260Q (Tilt Sensor) by Brian Mogensen

Brian Mogensen — Wed, 17 Feb 2010 16:13:30 +0000

Hello there!

Thanks for a nice library for the MMA7260q – I’m just curious about how the get the numbers
from the calibration/tilt code to f.ex processing? Which numbers is it exactly ?

Hope you can help, and sorry for the more or less newbie’ish questions :-)

Sincerely
Brian Mogensen, from denmark

Comment on DS1620 temperature sensor library for Arduino by ruben.laguna

ruben.laguna — Fri, 12 Feb 2010 15:00:31 +0000

I didn’t test this at below 0 temperatures. It certainly won’t work properly
-0.5C will be read as 511/2.0 = 205.5C
-25C will be read as 462/2.0 = 231.0C
-50C will be read as 402/2.0 = 201.0C

I will take a look and see if I can fix the library to support negative temperatures. But I can’t really test it right now

Comment on Firefox and file:// Windows UNC paths by Ståle L. Hansen

Ståle L. Hansen — Tue, 09 Feb 2010 10:50:48 +0000

This URI is works (tested on FF 3.5.7 and 3.6):

file://localhost///servername/share/file.txt

(And this hacky solution too:
file:///\\servername\share\file.txt )

This is a security issue, see e.g.:
http://en.wikipedia.org/wiki/File_URI_scheme

Comment on Subversion error: 503 Service unavailable by Randy

Randy — Thu, 04 Feb 2010 02:40:01 +0000

You saved my life man! This took forever to find out.

Comment on DS1620 temperature sensor library for Arduino by Phillip

Phillip — Mon, 01 Feb 2010 19:17:04 +0000

Hello Ruben. Great code. What happens when the temp drops below 0 Celcius? I guess there has to be some inverting to get the negative temperature eg:Ctemp = ^raw_data+1. If you have done this then maybe you can mention the additional code needed for reading below 0 degrees.

Thanks
Phillip

Comment on Arduino sleep mode – Waking up when receiving data on the USART by tekinay004

tekinay004 — Fri, 29 Jan 2010 05:37:42 +0000

Hey Ruben. I am a newbie here working on Arduino 0017 (Duemilanove) for our project. I want to awake my arduino whenever I get a 5V from a device. Since this is going to be an interrupt, I set the pin number 2 as input and set it to 0V, then wait for a CHANGE to wake the Arduino?
Does this seem reasonable ? Can I actually set an input pin as 0V?