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46  Using Arduino / Project Guidance / Re: a decibal sensor on: May 28, 2014, 09:46:35 pm
If I recall correctly the hardest part of measuring decibels is that you need to model the frequency response of the human ear, so you need to measure the amplitudes of the sound at different frequencies and the hardware specified connected to the arduino will be measuring sound as a function of time.  The time based measurements can be transformed into frequency based measurements through the use of Fourier transforms and there are libraries available to do this.
47  Using Arduino / Project Guidance / Re: Arduino for extensive Image processing and suitable camera. on: May 28, 2014, 09:36:11 pm
Look at the ARM platforms as they are used for image processing in smart phone, digital cameras, assorted military products, etc.  OpenCV is used quite extensively with ARM processors.

Hope this helps,
48  Using Arduino / Project Guidance / Re: Robust Radio Communication Protocol on: May 21, 2014, 09:35:45 am
XBee's are robust.
49  Community / Gigs and Collaborations / Re: Paid Project - Help needed for fading LED pattern on: May 20, 2014, 08:18:43 am
I replied to you by Facebook and look forward to hearing from you.

50  Community / Gigs and Collaborations / Re: boxing bag on: May 19, 2014, 03:12:02 pm
Yes, I thought about Piezos but thought that with 3-axis accelerometers it would be easier to determine where the bag was hit.

Maybe, maybe not I have not given it a lot of thought.
51  Community / Gigs and Collaborations / Re: Anyone interested in writing a sketch on: May 19, 2014, 11:54:27 am
You might want to be a little more definitive in your posting as right now all you need is help you may want to include one or more of the following:
  • A description of the project
  • How far you have gotten so far
  • Explicitly state what you need done and your requirements
  • When do you need it done
  • How much are you going to oay for this work to be done
There are other questions interested people may ask so be ready to respond to them.  Many postings here disappear into a black hole and no one hears from the OP ever again, please let us know more info and also when you find a solution post that you have your problem fixed.
52  Community / Gigs and Collaborations / Re: boxing bag on: May 18, 2014, 10:35:04 am
Why not use accelerometers they are cheap enough to place multiples on a boxing bag and when you hit you could determine the region that was hit by analyzing the signals from the sensors.  I worked on system in the past that would subject MEMs sensors to very high-G impacts and we never lost one of the sensors.  The accelerometers will be able to sustain the impacts, the weakest point for either method is probably the wired connection attaching to the board itself.

53  Using Arduino / Project Guidance / Re: Time lapse slider program on: May 17, 2014, 03:19:14 pm
I think I would choose a wireless transceiver that has an onboard MCU with one or more GPIO pins.  Choose one of the pins to be output and connect this to the remote shutter release, this would eliminate cables and make for a cleaner installation.  I have set Zigbee pros up to to this at 1,000 meters for my Nikon DSLR.

You will need to spec more of the requirements for the slider for us to help.

Hope this helps,
54  Using Arduino / Project Guidance / Re: please help with my project since i do not want to fail on: May 15, 2014, 10:50:13 am
by fail i mean fail a high school class

Keep in mind that you are one who may or may not fail as such you should do what others have asked of you instead of ignoring them.  You need to do something to pass the course we do not.

Look up what it means to declare a variable in C, Google is your friend.
55  Using Arduino / Microcontrollers / Re: How To detection of explosives materials ....? on: May 13, 2014, 12:06:53 pm
Governments would monitor this discussion only if they thought they might gain information about explosive detection, they would really like to have better ways of doing explosive detection and would take it from any source and validate on their own.  There is nothing wrong with people researching, building, talking about, ... explosive detection, now if we started to explore defeating the existing technologies they might get concerned. 

Someone who is stupid enough to be discussing nefarious affairs with explosives on an open forum with the readership like this one is very probably too stupid to build a device that would work. 
56  Using Arduino / Project Guidance / Re: How to synchronize many arduinos - shared clock on: May 13, 2014, 09:26:47 am
Probably the most accurate time base you can provide remote Arduinos is using the pulse per second (PPS) option on GPS receivers assuming you have receivers at each Arduino, it is used to re-zero the clock, but the Arduino crystal is still the timer.  Trying to provide resolution of 10-9 sec with a clock that has a crystal with a period of 6.25 x 10-8 sec. is not going to work.

How is the device going to ingest the data from the four Arduinos at the same time without some buffering?  Do you have 4 receivers or does the receiver have a baud rate fast enough to collect 4 messages inside of a couple nanoseconds.

I think you need to explain in detail what you are trying to do and then the incredible body of experience here may be able to help, all we can do without detail is tell you why it won't work not how you achieve your desired result.
57  Using Arduino / Project Guidance / Re: Which flight controller should i use for a fully autonomous Quadcopter ? on: May 11, 2014, 10:09:46 pm
The FAA is the agency to worry about.
58  Community / Gigs and Collaborations / Re: Need help to finish coding Arduino for a Zombie Sensor on: May 08, 2014, 07:34:48 am
The false positive would be indicated if it ever detected a zombie.
59  Using Arduino / Project Guidance / Re: sim card for GPRS shield in USA on: April 21, 2014, 01:32:26 pm
I went with these guys
$5/month for 500k and $10 for the SIM card.

$5 per month was what hooked me for development I am not worried about the 500k limit, if I need more I may look around a little bit more.  I just ordered the SIM so I do not have much idea about their service ask me in a bit.

60  Using Arduino / Project Guidance / Re: solar tracker problem on: April 19, 2014, 04:23:14 pm
I like the idea of LDRs for tracking the sun. It is wonderfully simple.

I find calculating the positions of the sun easier and less prone to error, the math is not that scary.
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