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1  Using Arduino / Motors, Mechanics, and Power / Re: Arduino Motor Shield R3 Help on: March 31, 2012, 03:30:55 pm
Tell me again your stepper motor connections? how do I wire the two coils?  If I connect them across A+/A- and B+/B-, thats all four wires.  What are you connecting pins 12 and 13??


Can anyone help me connect a bipolar stepper motor and get it running. I have found tutorials with older Arduino Motor Shields but no the R3.  Do I connect all 4 of the stepper motor wires to the A+,A-,B+,B- ?  And then control the steps with the #12 & #13 pins (Dir A, Dir B)

Thank You
2  Using Arduino / Sensors / Re: Measuring small distances on: July 11, 2011, 08:34:33 am
These are some great suggestions, thanks to everyone. 

I'm trying to measure the distance i'm running a sensor over.  like the digital tape measure here:

(Except with higher resolution.) 

I like the LVDT idea, and will look at how it could be adapted to rolling over a surface.  But since I need to be in contact with the surface I'm traveling over, it seemed like something wheel based would be better. 

Another thought I had was using something optical, but I can't be sure of the reflective properties of the surface.

I should have included this on my first post, my apologies.  Any thoughts??
3  Using Arduino / Sensors / Measuring small distances on: July 10, 2011, 06:08:06 pm
I have a project that needs to be able to measure a sensors movement across a surface.  Like an electronic tape measure, except I need resolution of .01 inch, or about .25mm. I believe a standard optical mouse has .001 resolution (1000 dpi?) but I'm looking for a discrete sensor to connect to an arduino.

A small wheel seems like a good start, and measuring the revolutions as it rolls over the surface, but I can't seem to get the resolution that I need.  Thoughts?
4  Development / Other Software Development / Re: Small sketch for TSL235R Light to Frequency sensor on: June 09, 2011, 12:58:22 pm
...In contrast to the TSL230R it has no configurable divider for the frequency so the # IRQ's can become quite high. Today's max inhouse ~160000 . Therefor I used only the rising edge for the IRQ routine. When it is really really dark one could use CHANGE edge for the IRQ, to double the precision, but be carefull as your Arduino might get stalled during daylight smiley

As always comments and remarks are welcome,


I'm seeing this too, if the sensor sees the window the script output stops.  When I shield the sensor from bright light, it starts streaming output again, with the first value read being very high.

How do I set this up to scale for brighter environments? I'm trying to design a logger that tracks how many minutes of sunlight there are at a given location over the course of a day.  Any suggestions on getting this sensor to do the sensing?

Cheers, D 
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