Problem MMA7361

Using Arduino Sensors
1

I have this accelerometer. http://store.extremeelectronics.co.in/images/D/mma7361_tripleaxisaccelerometer.jpg
Arduino code

#include <AcceleroMMA7361.h>

AcceleroMMA7361 accelero;
int x;
int y;
int z;

void setup()
{
  Serial.begin(9600);
  accelero.begin(13, 12, 11, 10, A2, A2, A3);
  accelero.setARefVoltage(3.3);                   //sets the AREF voltage to 3.3V
  accelero.setSensitivity(LOW);                   //sets the sensitivity to +/-6G
  accelero.calibrate();
}

void loop()
{
  x = accelero.getXAccel();
  y = accelero.getYAccel();
  z = accelero.getZAccel();
  Serial.print("\nx: ");
  Serial.print(x);
  Serial.print(" \ty: ");
  Serial.print(y);
  Serial.print(" \tz: ");
  Serial.print(z);
  Serial.print("\tG*10^-2");
  delay(500);                                     //make it readable
}

Pin connect:
x-A0
y-A1
z-A2
Sl-13D
0G-11D
3v3-3.3V
GND-GND
GS-10D
ST-12D

and Serial Monitor code is this:

3

Calibrating MMA7361011..................................................
DONE
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2
x: -2 	y: -2 	z: 100	G*10^-2

How to work...please help me.

2

You are using this library : Google Code Archive - Long-term storage for Google Code Project Hosting.
Do you have the newest version ?
Do you know if it is any good ?

Have the sensor laying flat horizontal.
Start the sketch.
It will calibrate to earth gravity. So 'x' and 'y' are zero, and 'z' is 1g.

The text "G*10^-2" is a (bad and almost unreadable) way to tell you that the unit is 1/100g. So 'z' is written as '100' in the unit '1/100' g.

The values for 'x' and 'y' are -2 and not zero. Perhaps you can add some delays. Perhaps 1 second delay before the calibrate function and 1 second delay after it.

3

Not work...i have arduino uno

4

From the library:

/// setARefVoltage(double _refV): Sets the AREF voltage to external, (now only takes 3.3 or 5 as parameter)
/// default is 5 when no AREF is used. When you want to use 3.3 AREF, put a wire between the AREF pin and the
/// 3.3 V VCC pin. This increases accuracy

unless this "3v3-3.3V" is that connection