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46  Community / Gigs and Collaborations / Re: Help wanted on hardware,software for pay on: February 01, 2013, 05:46:49 pm
Have you chosen a method to measure the sound pressure level (decibels)??  In general the SPL is not as easy as just measuring the output of the amplified output of the mic, many methods require the analysis to be done in the frequency domain and Arduino may be over tasked depending upon the rate that you want the measurements made.

I would be interested in implementing a method for measuring the SPL and the force (load) sensor, if you have researched and determined the best way to measure the SPL for your application.  I want you to choose the method for two reasons; 1)  I am not an acoustics engineer and 2) your concern about repeatability concerns me as it may be hard to deliver if the method does not match the environment enough.  I would also require you to quantify what the repeatability requirements are, by doing this we both have the same threshold for completion and this is important for both parties to be happy at conclusion of the project.

Send me a PM if you want to discuss this offline and I will give you my direct contact information.

It may sound like I am being a PITA I just want you to understand what I need to complete the project satisfactorily,

47  Using Arduino / Project Guidance / Re: torque sensor on a bike on: February 01, 2013, 03:29:53 pm
I think a load cell on the pedal would be the way to go.   To get the signal off the pedal either use Bluetooth or a slip ring to directly get the electrical signals, power and ground off the rotating pedal.
48  Using Arduino / Sensors / Re: 3D xbee triangulation on: January 31, 2013, 10:49:57 pm
I would be concerned about the comms latency of any of the Bee's or any other radio with a networking stack on it as the time it takes to send out a beacon pulse and to receive the same pulse is not deterministic.
49  Using Arduino / Sensors / Re: Finding a Sensor for Measuring Weight/Mass on: January 26, 2013, 10:41:26 am
Google "Load Cell" and then Google "Instrumentation Amplifier" this may help.

50  Using Arduino / General Electronics / Re: CAT5 LAN cable to carry sensor output signals on: January 19, 2013, 05:04:44 pm
I use CAT5 for digital signals coming from sensors and to power the sensors but have not gone much beyond 30 feet.  It should be a very easy thing to test and report the results here.
51  Using Arduino / Displays / Re: new LiquidCrystal library problems on: January 02, 2013, 07:55:22 pm

I deleted the original library and all is good.  Yes you were right that I had a spelling problem.

52  Using Arduino / Displays / Re: new LiquidCrystal library problems on: January 02, 2013, 05:46:05 pm
It seems I am having the same problem as ZK in terms of the library not being found and it is driving me a little crazier.  I downloaded the the zip file from and unzipped it into the following directory C:\Program Files (x86)\arduino-1.0\libraries\LiquidCrystal I renamed the original LiquidCryrstal directory in case I need it again.  When I restarted the IDE the examples are found so I thought great we are cooking with gas.  I loaded the example HelloWorld_SR as I have shift register on the LCD and have had it working under a different library.

Compiled the HelloWorld_SR skecth and got the following error 'class LiquidCrysatl_SR' has no member named 'createChar'  I commented out the line with createChar to see if it was only that function and got the same error except this time it was for 'home'
#include <Wire.h>
#include <LiquidCrystal_SR.h>

LiquidCrystal_SR lcd(8,7,TWO_WIRE);
//                   | |
//                   | \-- Clock Pin
//                   \---- Data/Enable Pin

// Creat a set of new characters
byte armsUp[8] = {0b00100,0b01010,0b00100,0b10101,0b01110,0b00100,0b00100,0b01010};
byte armsDown[8] = {0b00100,0b01010,0b00100,0b00100,0b01110,0b10101,0b00100,0b01010};

void setup(){

  lcd.begin(16,2);               // initialize the lcd

  lcd.createChar (0, armsUp);    // load character to the LCD
  lcd.createChar (1, armsDown);    // load character to the LCD

  lcd.home ();                   // go home

void loop(){
  // Do a little animation
  for(int i = 0; i <= 15; i++) showHappyGuy(i);
  for(int i = 15; i >= 0; i--) showHappyGuy(i);

void showHappyGuy(int pos){
  lcd.setCursor ( pos, 1 ); // go to position
  lcd.print(char(random(0,2))); // show one of the two custom characters
  delay(150); // wait so it can be seen
  lcd.setCursor ( pos, 1 ); // go to position again
  lcd.print(" "); // delete character

I must have done something stupid but I am at a loss to figure out what it is I did wrong.


53  Using Arduino / Project Guidance / Re: Incorporated Arduino DUE project - Soccer Robot on: December 31, 2012, 03:48:19 pm
Be careful when not installing stuff like the JTAG header as they are sometimes quite nice for programming and debugging.
54  Community / Gigs and Collaborations / Re: Looking for help to set up an open source charge controller shield + vt100 emula on: December 30, 2012, 08:59:37 pm
I stand corrected I guess I never thought I would see one and did not think they were still in use.  I agree they were extremely robust and it is good to see there is a use for dinosaurs, there may be hope for me also, although I was never so robust.
55  Community / Gigs and Collaborations / Re: Looking for help to set up an open source charge controller shield + vt100 emula on: December 30, 2012, 11:59:50 am
"VT100 Emulation"  Wow!! Talk about a blast from the past.  I do not think I have used a VT100 emulator for 20 years and surprised and maybe a little nostalgic that they still have use in the world today.  Although, with death of DEC and other mainframes I am at a loss to guess where there use is.

56  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.
57  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.

58  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.
59  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
60  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.
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