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31  Using Arduino / Project Guidance / Re: i need help for my graduation project on: June 12, 2014, 01:59:51 pm
Doing degree completion for money could be disastrous because we would be unleashing completely unqualified engineers on the world and some of them will be designing things that could cause you harm.

With the internet and many documented  cases of plagiarism and cheating in school many students (the OP I am sure does not fall into this category) many engineering students have never been confronted with a problem that a million people have not already done, documented it put it on the web etc.  As I would tell my engineering students no one is going to pay you much money to answer questions that have already been asked.  The hardest problem assigned in your 4 years of class will be easier than a very simple project out in the field.
32  Using Arduino / Sensors / Re: IR reflectance sensor pendulum on: June 11, 2014, 03:40:46 pm
tape a narrow stick on the bottom of the bell and place a photo interrupter so that the stick blocks it as it passes by.

33  Using Arduino / Project Guidance / Re: Help with rebuilding electric golf trolley. on: June 11, 2014, 03:38:00 pm
I personally would use a solid state relay as they have come down in price and controlling that much power is a trivial thing for an SSR as long as you use the spec'ed heat sink.  I may be a little biased but spending a little extra money and getting one a little oversized is a good thing.  It is hard for manufa, ctures to over spec things because they are making 100's, 1000's whatever and want to make as much profit as possible and compete, you are only doing one so you can overbuild it in places.

34  Using Arduino / Project Guidance / Re: Help with Sound Sensor on: June 11, 2014, 08:30:00 am
If you want to amplify sound it will work.  You might want to state what you want to do before asking if it will work.

35  Using Arduino / Project Guidance / Re: Positioning using NRF24L01+ radios? on: June 10, 2014, 09:46:57 am
If where to place out alot of NRF24L01+ on the racks could I then use a noter NRF24L01+ and arduino on the forks of the forklift to determine on what locator the forks are depending on the streanghts of the sorrunding radios?

Probably not. RF signal strength and distance measurement are really not reliable unless under very ideal conditions.

The advice you are getting is spot on, listen to it.

Maybe the way to do what you want is with RFID tags on the shelves.  The Forklift would have an RFID reader interfaced to an Arduino and the Arduino would be radio linked back to the display you monitor.  This would fail if the sizes of the shelves were too small so the RFID reader got signals from more than one shelf. 

Hope this helps,
36  Community / Gigs and Collaborations / Re: Build us a cell-communication device that monitors a cabinet door on: June 09, 2014, 10:25:55 pm
It seems we did not inspire the OP with greatness go here  I responded to him with a PM.

A pretty easy project that he wanted 50% solved in the proposal and then an interview in San Fransisco for a simple project.

Maybe his time is not expensive,
37  Using Arduino / Project Guidance / Re: really need help guys ... my graduation project :( on: June 09, 2014, 09:42:27 pm
Well let's see you say you need to graduate, and you are asking for help and the manner in which you asked the question showed limited knowledge in RF wave propagation, Arduino programming and XBee configuration, it sounds like your total project.  The key is  you need to graduate yet, you are asking for us to do the bulk of the work for you.

I taught at the college level for 11 years here in the USA and on the bottom of the syllabus under the Terms and Conditions section was the following:  There are no extra points granted because you have to graduate, because YOU are the one who is supposed to do the work to graduate not receive extra points just because you have a job lined up after graduation.

If your method was to work why would the unknown location have to be within the confines of the box defined by the location of the 4 XBees, if you have this magic equation that converts RSSI values to distance the sender could be anywhere in proximity.  In fact if you have this magic equation you really only need 3 XBees so I have saved you some money to put against next year's tuition, no thanks needed.  Are you asking on another forum for a large RF anechoic chamber to test your system in, and yet another forum to carefully measure the sensitivity levels of each XBee?

You will have more fun in school than any other time of your life so enjoy the extra time you will be having.

38  Community / Gigs and Collaborations / Re: Seeking Design and Prototype development for BBQ Temperature Controller on: June 09, 2014, 03:27:18 pm
You may want to start here  You will need a thermocouple and either an solid state relay (electric grill), electric valve (gas) which you will need if you went with an Arduino.

I use one very similar on my smoker and my curing box.

39  Using Arduino / Project Guidance / Re: Pest Repeller on: June 05, 2014, 01:42:51 pm

The first and hardest part of the task is to find how to repel the mosquitoes in the first place and then see if arduino would be a good controller of that repelling method.

I know the US army has done a lot of research in reducing mosquitoes, as it reduces effectiveness if the troops don't get sleep mosquitoes carry pathogens with them at times, and they found the best solution was to use a CO2 generator that is driven by a liquid propane tank.  After the mosquitoes get attracted to the CO2 a slight vacuum suck them up into a reservoir where they are not a bother to the troops.  Occasionally you have to empty the reservoir and you are done.  I have one that I used to use outside my house before the trees grew up and supported birds and other eaters of mosquitoes.

Not a lot of help I know,
40  Using Arduino / Project Guidance / Re: Graphic Overlay For Capacitive Touch Buttons on a PCB on: June 01, 2014, 07:08:52 pm
Well... inkjet printable vinyl sticker with a laminating clear sheet applied might be what you need. You need to make sure and get an inkjet printable vinyl that is compatible with your printer. IE, compatible with water based inkjet inks.

This is exactly the route I decided to try I ordered the vinyl and clear oversheet from papilio, I placed the order about an hour before your post.  I will keep people aware of the progress.

Thanks to all who read and to those that responded with ideas.

41  Using Arduino / Project Guidance / Re: Graphic Overlay For Capacitive Touch Buttons on a PCB on: June 01, 2014, 11:23:21 am
Thank you for the two responses, I appreciate them.

I should have included in my original post that I need a solid sheet not a transparent one as I want the solid color of the sheet to fully cover up the PCB.  In addition I should have included that this is for an outside un protected location for water soluble glue might not work the best.

Thanks Again,

42  Using Arduino / Project Guidance / Graphic Overlay For Capacitive Touch Buttons on a PCB on: June 01, 2014, 10:37:52 am
I have purchased a capacitive touch panel from Sparkfun and would like to find a plastic sheet that I could print with a laser or inkjet printer to use as an overlay for this panel.  Ideally, the sheet would have an adhesive on the back side, otherwise I would use glue that is acceptable to that application.  The overlay would have outlines and identifiers for the tough pads.

I have googled and looked on ebay and have been unable to find an appropriate material.  I imagine there is sheet material out there that is appropriate but I am probably not using the correct search terms.  So any help here would be great.

43  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.
44  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,
45  Using Arduino / Project Guidance / Re: Robust Radio Communication Protocol on: May 21, 2014, 09:35:45 am
XBee's are robust.
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