(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/06.Sensors/Memsic2125/Memsic2125.ino lang=arduino tabwidth=4:)

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/6.Sensors/Memsic2125/Memsic2125.ino lang=arduino tabwidth=4:)

Memsic 2125 Accelerometer

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Examples > Sensors

"Examples > Sensors"

click the image to enlarge

click the image to enlarge

The Memsic 2125 (datasheet) is a two-axis accelerometer capable of measuring acceleration up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis. By measuring the length of that pulse, in microseconds, using the Arduino's pulseIn() function, it is possible to determine the rate of acceleration and to use that data for your purposes.

The Memsic 2125 (datasheet) is a two-axis accelerometer capable of measuring acceleration up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis. By measuring the length of that pulse, in microseconds, using the Arduino's pulseIn() function, it is possible to determine the rate of acceleration and to use that data.

Use the small triangle on the Memsic to properly orient the sensor on your breadboard. Connect the 5V and GND pins of the Memsic 2125 to the power and ground ports on the Arduino. Connect digital pin 2 of the Arduino to the X out pin of the accelerometer, and digital pin 3 to the Y out pin.

Your Arduino must be connected to your computer in order for it to transmit serial data.

The Memsic 2125 (datasheet) is a two-axis accelerometer capable of measuring acceleration up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis. By measuring the length of that pulse, in microseconds, using the Arduino's pulseIn()? function, it is possible to determine the rate of acceleration and to use that data.

Connect the 5V and GND pins of the Memsic 2125 to the power and ground ports on the Arduino. Connect digital pin 2 of the Arduino to the X out pin of the Memsic, and digital pin 3 to the Y out pin.

See Also:

• pinMode()
• pulseIn()
• serial.begin()
• serial.print()

• ADXL3xx - read a ADXL3xx accelerometer.
• Ping - detect objects with an ultrasonic range finder.
• Knock - detect knocks/impacts with a piezo element

image developed using Fritzing. For more circuit examples, see the Fritzing project page

The 5V pin and GND pins on the Arduino are connected to the 5V and GND pins of the Memsic 2125; digital pin 2 of the Arduino is connected to the X out pin of the Memsic, and digital pin 3 is connected to the Y out pin.''

Hardware Required

• Arduino Board
• (1) Memsic 2125 Accelerometer
• bread board
• hook-up wire

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/6.Sensors/Memsic2125/Memsic2125.pde lang=arduino tabwidth=4:)

 (:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/Sensors/Memsic2125/Memsic2125.pde language=arduino tabwidth=4:)

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(:div class=code :)

 /*
    Memsic2125
    
    Read the Memsic 2125 two-axis accelerometer.  Converts the
    pulses output by the 2125 into milli-g's (1/1000 of earth's
    gravity) and prints them over the serial connection to the
    computer.
    
    The circuit:
 	* X output of accelerometer to digital pin 2
 	* Y output of accelerometer to digital pin 3
 	* +V of accelerometer to +5V
 	* GND of accelerometer to ground
   
    http://www.arduino.cc/en/Tutorial/Memsic2125
    
    created 6 Nov 2008
    by David A. Mellis
    modified 30 Jun 2009
    by Tom Igoe

  */

 // these constants won't change:
 const int xPin = 2;		// X output of the accelerometer
 const int yPin = 3;		// Y output of the accelerometer

 void setup() {
   // initialize serial communications:
   Serial.begin(9600);
   // initialize the pins connected to the accelerometer
   // as inputs:
   pinMode(xPin, INPUT);
   pinMode(yPin, INPUT);
 }

 void loop() {
   // variables to read the pulse widths:
   int pulseX, pulseY;
   // variables to contain the resulting accelerations
   int accelerationX, accelerationY;

   // read pulse from x- and y-axes:
   pulseX = pulseIn(xPin,HIGH);  
   pulseY = pulseIn(yPin,HIGH);

   // convert the pulse width into acceleration
   // accelerationX and accelerationY are in milli-g's: 
   // earth's gravity is 1000 milli-g's, or 1g.
   accelerationX = ((pulseX / 10) - 500) * 8;
   accelerationY = ((pulseY / 10) - 500) * 8;

   // print the acceleration
   Serial.print(accelerationX);
   // print a tab character:
   Serial.print("\t");
   Serial.print(accelerationY);
   Serial.println();

   delay(100);
 }

(:divend:)

/*

   Memsic2125

   Read the Memsic 2125 two-axis accelerometer.  Converts the
   pulses output by the 2125 into milli-g's (1/1000 of earth's
   gravity) and prints them over the serial connection to the
   computer.

   The circuit:
	* X output of accelerometer to digital pin 2
	* Y output of accelerometer to digital pin 3
	* +V of accelerometer to +5V
	* GND of accelerometer to ground

   http://www.arduino.cc/en/Tutorial/Memsic2125

   created 6 Nov 2008
   by David A. Mellis
   modified 30 Jun 2009
   by Tom Igoe

 */

// these constants won't change: const int xPin = 2; // X output of the accelerometer const int yPin = 3; // Y output of the accelerometer

void setup() {

  // initialize serial communications:
  Serial.begin(9600);
  // initialize the pins connected to the accelerometer
  // as inputs:
  pinMode(xPin, INPUT);
  pinMode(yPin, INPUT);

}

void loop() {

  // variables to read the pulse widths:
  int pulseX, pulseY;
  // variables to contain the resulting accelerations
  int accelerationX, accelerationY;

  // read pulse from x- and y-axes:
  pulseX = pulseIn(xPin,HIGH);  
  pulseY = pulseIn(yPin,HIGH);

  // accelerationX and accelerationY are in milli-g's: 
  // earth's gravity is 1000 milli-g's, or 1g.
  accelerationX = ((pulseX / 10) - 500) * 8;
  accelerationY = ((pulseY / 10) - 500) * 8;

  Serial.print(accelerationX);
  // print a tab character:
  Serial.print("\t");
  Serial.print(accelerationY);

The Memsic 2125 (datasheet) is a two-axis accelerometer capable of measuring acceleration up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis.

Schematic:

click the image to enlarge

The Memsic 2125 (datasheet) is a two-axis accelerometer capable of measuring up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis.

The 5V pin and GND pins on the Arduino are connected to the 5V and GND pins of the Memsic 2125; digital pin 2 of the Arduino is connected to the X out pin of the Memsic, and digital pin 3 is connected to the Y out pin.

Code

int xpin = 2;
int ypin = 3;

void setup()
{
  Serial.begin(9600);
  pinMode(xpin, INPUT);
  pinMode(ypin, INPUT);
}

void loop()
{
  int pulseX, pulseY;
  int accX, accY;

  // read pulse from x- and y-axes
  pulseX = pulseIn(xpin,HIGH);  
  pulseY = pulseIn(ypin,HIGH);

  // convert the pulse width into acceleration
  // accX and accY are in milli-g's: earth's gravity is 1000.
  accX = ((pulseX / 10) - 500) * 8;
  accY = ((pulseY / 10) - 500) * 8;

  // print the acceleration
  Serial.print(accX);
  Serial.print(" ");
  Serial.print(accY);
  Serial.println();

  delay(100);
}

Memsic 2125 Accelerometer

The Memsic 2125 is a two-axis accelerometer capable of measuring up to plus or minus 2g. It has a simple digital interface: two pins (one for each axis) emit pulses whose duration corresponds to the acceleration of that axis.

Circuit