I just bought NFC reader from: http://www.seeedstudio.com/wiki/NFC_Shield_V1.0
It is stated that: SPI interface. Hence, most Arduino pins are available for other applications
So can I still be used pin 9,10,11,12 for other bit transfer because it has already use SPI?
Or I cant?

Thank you!!!

I am doing a project with Arduino and other shield, resistors, power supply etc.
And I am asked to draw first the schematic how they wire each other each pin.
Anyone knows how to draw it? for example draw wiring from pin 13 to pin data on relay, etc..

Thank you help me.

So it means I need to use Darlington array like the shown image?
it there a way directly connect it to arduino pin?

Is there any ground pin?

What do you mean common to other pins?
Where I should connect that green common wires?

I have this kind of stepper motor

the type is PF42-48E5
and here is the data sheet: www.jameco.com/Jameco/Products/ProdDS/171601.pdf

I do not know how to connect this pin, which one is ground, vcc, data, and why so many colouuur???
Any heeelp?
Can I use this stepper motor in Arduino?

I have read that link but it is not complete to explain every possibility between 0,18,< or > or == ...

I have read a book that code like this:

Code:

if (Serial.available() > 18) {
char led = Serial.read();
if (led == 'S'){
temp1 = Serial.read();
temp2 = Serial.read();
temp3 = Serial.read();
temp4 = Serial.read();
temp5 = Serial.read();
temp6 = Serial.read();
temp7 = Serial.read();
temp8 = Serial.read();
temp9 = Serial.read();
}
}

what its purpose to put 18 there?

what is the difference between
if (Serial.available())
and
if (Serial.available() > 0)
and
if (Serial.available() > 18)
and
if (Serial.available() <10)
and
if (Serial.available() == 3)
???

this kind of led I refer to, but it is with different relay

I don't understand what that means. Is there a second LED involved, somehow?

What I mean is: that kind of schematic I do for my grove test, but not with that kind of relay.
I use the relay from here: http://www.seeedstudio.com/wiki/GROVE_-_Starter_Kit_V1.0b

the led on the board also did not light up..

this kind of led I refer to, but it is with different relay

I just bought a relay, here is the relay: http://www.seeedstudio.com/wiki/GROVE_-_Starter_Kit_V1.0b
I connect the pin D1 to the pin 7 Arduino, then pin Com to 5V, then pin ON to the LED, then pin VCC to 5V, then pin GND to GND Arduino.

Then I upload this coed to Arduino:

void setup()
{
pinMode(7,OUTPUT);
}
void loop()
{
digitalWrite(7,HIGH);
}

but nothing happen to my led and nothing click from the relay...
Does it mean my relay broken?
How to check it?

I suspect my Arduino UNO broken, but I do not it is true broken or any else. My pin 13 (which contain build in led) always ON
And after I upload this code:

Code:

void setup()
{
 Serial.begin(9600);
 digitalWrite (13,LOW);
}



void loop()
{
 while (Serial.available()==0);

int val = Serial.read () - '0';

if (val ==1)
{
  Serial.println("Led is On");
  digitalWrite(13,HIGH);
}
else if (val == 0)
{
 Serial.println("Led is off");
 digitalWrite(13,LOW);
}
else
{
 Serial.println("Invalid");
}
}

then I open serial monitor,
i input 0, then it displays "Led is off", but the led is not turned off

WHAT HAPPEN TO MY ARDUINO?? ANY HELP PLEASE...

Okay, nevermind. In India the Kinect for PC is costing around $400.

Wow, that is expensive.
I bought it in Indonesia, only cost around US$250..

Hmm it might be a little bit impossible to get the image data from kinect wirelessly since, it require very high data speed, remember if you wanna operate Kinect for Windows in PC, you need to install a lot of things, Simple OpenNI, OpenNI, KinectSDK, etc. It is my opinion, correct me if I am mistaken.

Using Kinect Camera to do color tracking and determine its coordinate using depth sensor, it is interesting since you also could use Processing to receive any data from Kinect and send data to your Arduino. Check this out: http://zugiduino.wordpress.com/2012/12/30/kinect-color-tracking/

Thank you all! I just want to make sure everything is working in safety.