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16  Using Arduino / Project Guidance / Re: CapSensing questions on: October 22, 2013, 03:52:52 am
Hi, 
If you read carefully the playground page of the capSense library, you can read that

1) these reading you get are not supposed to be constant. They do represent the capacitance of the capacitors virtualy connected to ground (look at the picture on the library page: http://playground.arduino.cc//Main/CapacitiveSensor?from=Main.CapSense) But it does not have any unit.

To answer the other questions you need to understand how it measures the capacitance.
What the library is actually returning if the time that the capacitor made by you and the aluminium foil takes to go to the same state (high or low) of the send pin, when it changes (ie. goes from low to high, or from high to low)
This time is representative of the capacitance because the time required to load a capacitor depends on it's capacitance, but it is not a very accurate way of doing it.
It might not be very clear(english is not my native language) but If you look at the playground page and at the code you will find answers to all your questions.
Hope I helped...
17  Using Arduino / General Electronics / Re: A good shop for electronics on: October 07, 2013, 02:12:02 pm
I didn't saw that... Thanks smiley
18  Using Arduino / General Electronics / A good shop for electronics on: October 07, 2013, 01:21:35 pm
Hi, I don't know if this topic really belongs in this category but anyway, I want to start pretty big projects, so I am looking for a good electronic component suplier. Could you suggest one, as I don't know which one is the better.
Thanks
19  Using Arduino / Installation & Troubleshooting / Error :bootloader.tool param missing on: September 22, 2013, 11:49:35 am
Hi, I am trying to follow this tutorial: http://arduino.cc/en/Tutorial/ArduinoToBreadboard (the last part, without the crystal), but when I try to burn the bootloader this error shows up: error bootloader.tool parameter missing
I checked i the provided "boards.txt" file and there isn't this entry.
Does anyone know what to add to the file so it works?
20  Products / Arduino Due / Re: Frustrated on: September 03, 2013, 01:57:50 pm
Did you try to look at the Sam3X8E 's datasheet?
[url]http://www.atmel.com/devices/SAM3X8E.aspx?tab=documents[\url][url]
(The second docment)
21  Products / Arduino Due / Re: Serial.read problems with Arduino Due on: August 28, 2013, 11:36:44 am
Add code tags to your code. Try this:
Code:
...
byte LVcmd [11];
...
for(int i=0;i<11;i++)
{
LVcmd[i]=Serial.read();
}
...
22  Products / Arduino Due / Re: ADMUX in Arduino Due on: August 27, 2013, 12:49:55 am
This code relies on the internal reference present on the AVR chips, which doesn't exist on the SAM3X8E, so I don't think you may get the code to work.
23  Products / Arduino Due / Re: arduino due + li-ion battery + usb charging on: June 28, 2013, 01:28:54 am
When fully charged, li-ion batteries have a voltage close to 4.2V, so I would recommend to connect it to the 3.3V of the due. Also keep in mind that the due does not have a charging circuit, so be careful when connecting the battery and the usb at the same time (it might explode)

The fio is different because it has an integrated charging circuit, to protect the battery and the board.
24  Products / Arduino Due / Re: How many inputs can the Due handle? on: May 04, 2013, 03:47:12 am
All of them smiley
Reference of interrupts:
Quote
The Arduino Due board has powerful interrupt capabilities that allows you to attach an interrupt function on all available pins. You can directly specify the pin number in attachInterrupt().
25  Products / Arduino Due / Re: SPI across two Arduino DUE's on: March 30, 2013, 04:16:50 am
Hi, the SPI library only supports master mode:
Quote
[...]Since this library supports only master mode[...]
(quote from the library page)
So the Slave due is acting as a master too. Unfortunately I don't know how the spi is implemented in the due, so I can't help more.
26  Products / Arduino Due / Re: for calculation of of simple multiplication on: March 15, 2013, 12:01:35 pm
Try
Code:
Serial.print(a,n)
with n being the number of decimals that must be displayed.
27  Using Arduino / Motors, Mechanics, and Power / Re: Arduino Motor Shield R3 Help on: February 28, 2013, 12:44:49 pm
Hello,

one shield with one stepper is nice for one direction.
Is it possible to connect a second Motor Shield R3 at the Arduino?

Thanks for information
yes you can use two, but not one on the other, you must put the other one next to your Arduino connect the pins of the "side-car" shield to others pins than the ones used by the first one ex:

==============================================
Arduino pin| shield on the Arduino | side-car shield
=========|===================|================
0              |NC                          |NC
1              |NC                          |NC
2              |NC                          |BRAKE A
3              | PWM A                    |NC
4              |NC                          |BRAKE B
5              |NC                          |PWM A
6              |NC                          |PWM B
7              |NC                          |DIR A
8              |BRAKE B                   |NC
9              |BRAKE A                  |NC
10            |NC                          |DIR B
11            |PWM B                     |NC
12            |DIR A                       |NC
13            |DIR B                       |NC
A1            |SNS 0                      |NC
A2            |SNS 1                      |NC
A3            |NC                         |SNS 0
A4            |NC                         |SNS 1
A5            |NC                         |NC
======================================
(you can change the pins connection of the side car shield if you want but make sure that you don't use a used pin by the "on Arduino" shield.
Of course you also need to connect the Vin pin, Gnd pin and 5V pin.

I don't have two shield so I can't show you a photo but it is something easy to do.
28  Using Arduino / Installation & Troubleshooting / Re: Removing a library from the IDE on: February 27, 2013, 11:44:57 am
I found were was my problem. I didn't noticed that all libraries are copied in the sketchbook folder. I removed it from there and it worked. smiley
29  Using Arduino / Installation & Troubleshooting / Re: Removing a library from the IDE on: February 27, 2013, 09:32:12 am
Nope, this doesn't work... by the way, maybe I should have tell that I use Arduino 1.5.2. Not the 1.0.3
30  Using Arduino / Installation & Troubleshooting / [SOLVED] Removing a library from the IDE on: February 27, 2013, 06:31:16 am
Hi, I would like to know how to remove a library that was added with the " add library". I tried to remove the files from the folder (even deleting the folder) but I still have the library name in the menu, and when I click on it nothing is included (because I deleted the files).
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