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106  Using Arduino / Project Guidance / Re: Microphone Circuit on: December 11, 2012, 10:17:53 am
Can you place another microphone upstream in the sax, if you can it may be possible to use the upstream mic as a switch that turns on the sampling if it get a signal before the ed. you placed.  This is not foolproof but may be any easy method that work well enough.
107  Using Arduino / Networking, Protocols, and Devices / Re: Clean, straight-forward MPU-6050 code on: December 10, 2012, 09:38:56 am

The alternative is to write the code you believe is needed for one device and share with the great unwashed.  Your example would show the world what it has been missing in easy and simple code and everyone would join the movement.

108  Using Arduino / Networking, Protocols, and Devices / Re: Best Entry-Level GPS Unit on: December 09, 2012, 11:47:01 am
From my experience running a team of engineers that developed, productionized, fielded, and supported a UAV system in a combat zone I have found GPS modules to be amazingly robust when it comes to mechanical shock.  I have seem small UAVs landed into a concrete wall at full throttle and fly the same electronics in the same or another bird by a simple swap out.  Note: UAV engineers often use the term land where a customer might make the mistake of saying crash.
109  Using Arduino / Networking, Protocols, and Devices / Re: Best Entry-Level GPS Unit on: December 08, 2012, 03:50:24 pm
I have had good luck with these guys
110  Using Arduino / Networking, Protocols, and Devices / Re: NRF24L01 networking proof of concept / demo video on: December 08, 2012, 03:46:49 pm
Nice video, maybe you could post the code you used for the POC here on the forum or a link to the code.
111  Using Arduino / Sensors / Re: physical position on: December 08, 2012, 03:40:29 pm
There are barometric pressure sensors that can be used as altimeters that have resolution of 10's of cm so it would tell you when the box was lifted, when compared to a baro sensor that stays at the same height so you can avoid false alarms due to changing atmospherics.  You could also look at rapid changes that would indicate lifting of the object and not changing atmospheric changes.
112  Using Arduino / Project Guidance / Re: How to use the Maestro A2035-H GPS receiver on: December 07, 2012, 04:56:04 pm
After the 200 ms pulse
113  Using Arduino / Project Guidance / Re: How to use the Maestro A2035-H GPS receiver on: December 07, 2012, 02:58:54 pm
It just starts spitting out NMEA data and they work good I use them for time stamping timing critical events on remote nets.  If you contact tech support with Maestro you email with "Larry" and this is not much better than the manual but once he understands what you want and stops telling you really basic things off his troubleshooting sheet you get what you need from someone behind the curtain.  Given the $20 cost for a fully functional GOS with PPS it is a great deal, even with the poor docs. 

They are surface mount parts but hand solder very easily.

Regarding the shutdown shutdown stuff I just wait the second  then shutdown power.
114  Using Arduino / Sensors / Re: ADXL 335 Accelerometer for Leveling? on: December 06, 2012, 09:43:15 am
The calibration data should also taken after the sensor is mounted on the board or in the system.
115  Using Arduino / Sensors / Re: ADXL 335 Accelerometer for Leveling? on: December 04, 2012, 09:45:32 am
How have you verified 0.5° accuracy?  Have you calibrated the unit?


116  Using Arduino / Project Guidance / Re: 555 Timer in Arduino? on: November 30, 2012, 11:21:15 am
Using the Arduino to replace the 555 in a monostable mode would be a mistake unless you are going to use additional capabilities of the Arduino, extreme overkill.
117  Using Arduino / General Electronics / Entry Level Oscilloscopes from Tektronix on: November 30, 2012, 11:18:30 am
Tektronixhas come out with a new line of oscilloscopes aimed at the hobbyist and educational market here is the link

I recently needed to replace my old scope and I just a used Tek scope that has fewer features (no digital storage is one) and paid a little less for it than the new Tek 25MHz scope.  Although my scope is a 100 MHz I do not need more than 25 Mhz paying a little more I would have gotten a new scope with a  5 year guarantee.
118  Using Arduino / Sensors / Re: ADXL 335 Accelerometer for Leveling? on: November 29, 2012, 11:11:20 am

like Darkside40 I would like to hear from you to see if you used any filtering and what type you used.  Can you elaborate how you got 0.5° accuracy for the unwashed massses like myself.
119  Community / Gigs and Collaborations / Re: Wanted: Build desktop device that moves a camera at a precise speed [$$ for you] on: November 27, 2012, 11:16:56 am
I built a system that was supposed to take pictures using point and shoot cameras correlated in time to an easily detected event.  The system never met the time requirements, the images would sometimes be at the correct time but usually they were late by some non-deterministic time.  Troubleshooting in the lab with function generators and o-scopes showed the detection system and camera triggering pulse were all well behaved, the problem was in the point-and-shoot camera as it would take a while to make the exposure adjustments to make sure  that the picture looked good and this screwed my timing up.

Since then whenever I need to do similar I read for one of my Nikon DSLR as they do not have that delay, they can be told to take the image when the button is pressed.  Point-and-shoot cameras may have evolved such that they ojn be told to just take the image at the time you want it or the beautification fast enough so the time delay is not seen.  On that point you probably want to quantify how tight you want the spec take a picture for 1/10 of a second so when the acceptance test rolls around you do not get into an argument about close enough.
120  Using Arduino / Microcontrollers / Re: New kid on the block on: November 27, 2012, 10:53:40 am
It is easy to get into a contest of "Mine is bigger/better than yours!" and that depends on what you want to do and what biases, skills, etc. that you bring to the project.  The great thing is we are able to have  "Mine is bigger/better than yours!" contests because there are many options on the market, this is great because it allows people a better shot at finding something they work with and enjoy doing it.

Options is GOOD
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