- Single-, dual-, or triple-axis
- Analog or digital output
- Dynamic and/or static (tilt) measurements
Theory of Operation (ADXL family and others):
- Micro-machines mass-spring system on top of silicon wafer
- Acceleration is proportional to displacement of the mass: a = k x / m
- Uses differential capacitor setup, which is proportional to x for small displacements
Analog Devices ADXL203: dual-axis, voltage output
- Tilt sensing:
- The internal update rate of the accelerometer can be adjusted in the range 0.5 Hz to 2.5 kHz using capacitors (Cx, Cy).
Interfacing the ADXL203 to the Arduino:
- Connect Xout and Yout directly to any analog input pins of the Arduino.
- Use the analogRead( pin ) function to directly measure the resulting voltage output from a given axis.
- The same example sketch used to measure variable resistances can be used for this purpose.
Interfacing the Arduino to other Accelerometers:
- Parallax Memsic 2125 Dual-Axis Accelerometer
- LIS302DL Triple Axis Accelerometer, Arduino program, SCL to Analog Pin 5, MOS1 to Analog Pin 4, Vcc to 5V, Gnd to Gnd.
- MMA7260Q Triple Axis Accelerometer, read variable output voltage from X, Y, or Z pins into any analog pin, Vcc to 3.3V, GS1 and GS2 to Gnd (for 1.5g), SLP to 3.3V.
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Maintained by Gary P. Scavone.