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accelerometer.md

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Accelerometer [ADXL345]

The ADXL345 is a 3 axis digital accelerometer. It utilizes the I2C and or SPI protocols to commiunicate with micro-controllers.

It's application can range from motion sensing, tilt sensing, impact detection, freefall detection and vibration monitoring.

DataSheet

Detailed Datasheet

Displaying real-time 3 axis acceleration data

Components List

  1. 1 - ADXL345 with header pins soldered
  2. 4 - F to F connectors

Note that Board numbering is used, NOT Broadcom numbering

  1. Pin 2 (5V Vcc)

  2. Pin 3 (SDA)

  3. Pin 5 (SCL)

  4. Pin 9 (GND)

GPIO Pinout

Refer to this diagram to understand the pins we are using

Note that Board numbering is used NOT Broadcom numbering

Diagram Schematic

Diagram Scematic

Diagram Schematic

Circuit Schematic

Circuit Schematic

Software Dependancies

To run Ic2, several configurations are needed.

  • The below script will install all dependanies
sudo apt-get install python3-dev python3-dev python3-pip python3-smbus i2c-tools -y
  • Enable the I2C interface on the pi

I2C interface enabling

  • Run the command below to ensure the accelerometer is being detected
i2cdetect -y 1

IMPLIMENTATION

# Print out x, y and z coordinate data 

import time 
import board
import busio 
import adafruit_adxl34x
import subprocess


i2c = busio.I2C(board.SCL, board.SDA)
accelerometer = adafruit_adxl34x.ADXL343(i2c)

try:
    while True:
      print("%f %f %f" %accelerometer.acceleration)
      time.sleep(.1)
      subprocess.run("clear", shell=True)

except KeyboardInterrupt:
    print("\nExiting...\n")

Code link.

Sample output