I'm not finding any tutorial for a sharp sensor. All I really want to do right now is use the sensor to detect an object 10cm away and turn on an LED. I just not sure how I measure distance. If someone could point me in the right direction that would be great. Thanks a bunch.
int LED =13;
void setup()
{
pinMode(LED, OUTPUT);
}
void loop()
{
int distance = analogRead(0);
if ( distance > 2 )
{
digitalWrite(LED,LOW);
}
else
{
digitalWrite(LED,HIGH);
}
}
When I run this code the Led is on all the time but when I get in the 17inch and under it goes off. So how do I get it to read cm.
I figure it out.
Hi, a sharp gp2d120 has just arrived.
can you post your code that works? it would be appreciated 
thank you
void setup()
{
Serial.begin(9600);
}
void loop()
{
Serial.println(analogRead(0));
delay(1000);
}
This right here you can measure the distance and write down what the number is for each distance.
int LED =13;
void setup()
{
pinMode(LED, OUTPUT);
}
void loop()
{
int distance = analogRead(0);
if ( distance == 321 )
{
digitalWrite(LED,HIGH);
}
else
{
digitalWrite(LED,LOW);
}
}
Here is just something to turn and Led on when it equal to the distance I got from the serial print which is 3 inch, yours might be a tad bit different number. Sorry took so long to get back. Let me know if you have any othe question and I will try to help you out.
Hi - someone asked me about this the other day so here is the info I gave him:
--Roy
This is the sensor I used:
http://www.acroname.com/robotics/parts/R48-IR12.html
comparison of the Sharp sensors:
http://www.acroname.com/robotics/info/articles/sharp/sharp.html#e8
I got a better price at http://www.pololu.com/ as I recall - but wherever you buy it *Be Sure to get the connector with it - it's a non-standard connector that is hard to find.
Here's some code for reading the sensor:
http://www.tigoe.net/pcomp/code/category/arduinowiring/44
Using a capacitor with the Sharp sensor (this was important):
http://www.gorobotics.net/articles/sensors/effectively-using-the-sharp-gp2d12-rangefinder
http://www.oopic.com/oirrange.htm
thank you so much! i'm starting now to experiment!
Unfortunely I've made a mistake on ordering sensor 
I have bought this one GP2D15
http://www.acroname.com/robotics/parts/R49-IR15.html
that is digital one type.
no pain 
but I tried to make it working but i have a problem, as when i test the digital response from the sensor, the reply is not accurate.
this is the code:
/*
digital sensor reading SHARP GP2D15
code by A.Richetta
V. 0.1 26 APRIL 2009
version: NOT WORKING
*/int POS = 3; // initializing sensor
int LED_ROSSO = 6; // initializing RED LED
int LED_VERDE = 4; // initializing GREEN LEDvoid setup()
{
Serial.begin(9600); //SPEAKING WITH SERIAL
pinMode(POS, INPUT); // SENSOR IS AN INPUT TYPE
pinMode(LED_ROSSO, OUTPUT); // LED IS OUT
pinMode(LED_VERDE, OUTPUT); //LED IS OUT}
void loop()
{
if (digitalRead(POS) == 1) // READING SENSOR, IF 1 IS BACK THERE IS AN OBJECT
{
digitalWrite(LED_ROSSO,HIGH); // TURN RED LED ON
digitalWrite(LED_VERDE,LOW); // TUNR GREEN OFF
Serial.println("ostacolo"); // PRINT ON SERIAL OBJECT!!
delay(1000);
}
else
{
digitalWrite(LED_VERDE,HIGH); // TURN GREEN LED ON
digitalWrite(LED_ROSSO,LOW); //TURN RED LED OFF
Serial.println("nessun ostacolo"); // SERIAL PRINT NO OBJECT IN FRONT OF ME
delay(1000); // WAIT SOME TIME
}
}
Problem is, when no obstacle is in front of the sensor it's ok, green led is correctly on.
when i put my hand in front of the sensor, it starts to turn on red and off, turn green onn and off and so on.
i made mistakes in code?
thank you for any reply
thank you all for kind reply!
i've figured out
I am currently working on my senior capstone project for Engineering Development and Design, and it sounds like it is somewhat similar to what you are attempting to do. I have a gp2d120 but have no idea how to wire it for it to turn on an led, and have no idea how to write a code. I'm wondering if anyone here can give me a crash course on this business?