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91  Using Arduino / Project Guidance / Re: Temperture/humidity sensor ? on: February 19, 2013, 11:06:33 am
Do you really need to measure the humidity to a resolution of 0.1%, I ask because if you do absolutely do the sensor is going to cost you a lot of money.  Maybe you could tell us what you are using the measurements for we may be able to help you on your requirements.
92  Using Arduino / Sensors / Re: Pressure Sensor help on: February 07, 2013, 11:02:24 am
If it has to stay within its threshold put one under each leg of the coach.
93  Using Arduino / Project Guidance / Re: Doppler Speed Radar on: February 07, 2013, 10:58:28 am

If I can ask what did you pay for the MDU1720 modules and where did you get them?

94  Community / Products and Services / Re: PCB Service, less than $100.00 for prototype orders. No tooling cost for reorder on: February 06, 2013, 04:28:07 pm

You mention in your subject line and in a post that there is no tolling cost for reorders but do not tell us what the toolong cost is so we can determine what future orders will cost, if you want to be considered for real you should let us know what the tooling cost is.  You say factory costs in China are more than $9.90 for 10 boards maybe you should just contract with or and making $90 per order that is pretty good money for transferring orders.

95  Using Arduino / Sensors / Re: X-Ray detector/sensor on: February 03, 2013, 04:07:51 pm
What good comes out of X-raying a car, I would think the metal skin would either absorb or scatter all of the radiation leaving little to image with?
96  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,

97  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.
98  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.
99  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.

100  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.
101  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.

102  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.


103  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.
104  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.
105  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.

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