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ADXL335

The ADXL335 is a low power, complete 3-axis accelerometer with analog outputs. The sensor measures acceleration with a minimum full-scale range of ±3 g. It can measure the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration. It captures the x, y and z channel at the same time.

1. How to connect and use the sensor

  • Follow the layout in the figure below and connect the sensor with the mote:

Test Image

  • Connect the sensor with the computer as shown below:

Test Image

  • Go to the directory /home/user/snowfort/snowfort_example in the terminal
  • Open the file ADXL335_example.c and look for the line with #define SAMPLE_RATE 20 so you can adjust the frequency
  • Save the change
  • Compile and load the file ADXL335_example.c into your mote
  • Log into your mote
  • You should see the output messages like the figure below:

test image

2. How to interpret data

In the output, the first column represents the acceleration on x-axis, the second column is the acceleration on y-axis, the third column is the acceleration on z-axis, and the fourth column is a voltage reference.

The following formula is used in order to get the real acceleration values:

		V_in = reading value/2048 * 1.5V
		Acc = (V_in - 1.5V)/(300mV/g)