Accelerometer GY-291 ADXL345 3 Axis Gravity Sensor Module

The ADXL345 is a high-performance, small, thin, low-power 3-axis accelerometer with digital output that measures acceleration in the X, Y, and Z axes. It is capable of measuring acceleration with high resolution and sensitivity across selectable ranges from ±2g to ±16g. This module is widely used in applications like motion sensing, device orientation, free-fall detection, and gaming control systems. Its dual interface support (I2C and SPI) makes it compatible with popular microcontrollers such as Arduino, AVR, and 8051 series.

Package Includes:

1 x ADXL345 3-Axis Accelerometer Module

26.25 AED (Tax included)

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Features:

3-Axis Sensing: Measures acceleration in X, Y, and Z directions
Measurement Ranges: ±2g, ±4g, ±8g, ±16g (user-selectable)
Interface: Supports I2C and SPI communication protocols
Resolution: 10 to 13-bit resolution depending on range
Low Power Consumption: Ideal for battery-operated and portable devices
Free-Fall Detection: Built-in functionality to detect sudden drops
FIFO Buffer: 32-level FIFO to store data and reduce CPU overhead
Tap/Double Tap Detection: Detects user input for interactive devices
Activity and Inactivity Monitoring: Intelligent motion tracking

Specifications:

Parameter	Value
Chip	ADXL345
Operating Voltage	3V to 5V
Communication	I2C and SPI
Measurement Range	±2g, ±4g, ±8g, ±16g
Resolution	Up to 13-bit
FIFO Buffer	32-level
Power Consumption	Low power, configurable modes

Pinout Description:

Pin	Description
GND	Ground (connect to system GND)
VCC	Power supply input (3V - 5V)
CS	Chip Select (used for SPI communication)
INT1	Interrupt Output 1 (for motion events)
INT2	Interrupt Output 2 (for other user-defined events)
SDO	Serial Data Out (SPI); also used to set I2C address
SDA	Serial Data (I2C), Serial Data Input/Output (SPI)
SCL	Serial Clock (I2C/SPI)

Applications:

Orientation sensing and tilt detection
Motion-activated user interfaces
Gaming motion controllers
Fall detection in safety devices
Step counting and wearable activity tracking
Vibration monitoring

Example Arduino Connection (I2C Mode):

VCC → 3.3V or 5V
GND → GND
SDA → A4 (on Arduino Uno)
SCL → A5 (on Arduino Uno)

Library Required:

You can use the Adafruit ADXL345 library or Wire library for basic I2C interfacing.

Sample Arduino Code (I2C):


#include <Wire.h>
#include <Adafruit_ADXL345_U.h>

Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified(12345);

void setup() {
  Serial.begin(9600);
  if (!accel.begin()) {
    Serial.println("No ADXL345 detected.");
    while (1);
  }
  accel.setRange(ADXL345_RANGE_2_G);
  Serial.println("ADXL345 Initialized");
}

void loop() {
  sensors_event_t event;
  accel.getEvent(&event);

  Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print(" m/s² ");
  Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print(" m/s² ");
  Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.println(" m/s²");

  delay(500);
}