Fermion ADXL345 Digital Triaxial Accelerometer

This DFRobot Fermion breakout carries the three-axis accelerometer ADXL345 from Analog Devices. It measures up to ±16 g with 13-bit resolution and is suitable both for tilt measurement via gravity and for motion, shocks, taps and free fall. With 4 mg/LSB, changes in inclination of less than 1° can be detected. The sensor is read via I2C or SPI, two interrupt pins signal events such as activity, inactivity or double taps.

A voltage regulator on the board supplies the chip, the signal lines have no level shifter (schematic V2.0).

Features:

• ADXL345 accelerometer, 3 axes, 13 bit
• Selectable range ±2, ±4, ±8 or ±16 g
• Tap, double tap and free-fall detection
• Activity and inactivity detection with adjustable threshold
• FIFO buffer for 32 readings
• I2C or SPI interface (3 or 4 wire), 2 interrupt outputs
• Voltage regulator on the board

Application Examples:

• Tilt and orientation measurement
• Vibration and fall detection
• Motion-controlled operation and step counters

Documentation:

• Wiki DFRobot SEN0032
• Example code for Arduino (DFRobot wiki)
• Datasheet (PDF)
• Schematic (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0032
• Sensor: Analog Devices ADXL345
• Board supply: 3.3 to 6 V (DFRobot wiki), regulator BL8555-30 (schematic V2.0)
• Chip supply: 2.0 to 3.6 V
• Current consumption: 40 µA in measurement mode, 0.1 µA in standby (at 2.5 V)
• Measuring range: ±2 / ±4 / ±8 / ±16 g
• Resolution: 13 bit, 4 mg/LSB
• Interface: I2C (address 0x53 in the DFRobot example) or SPI
• Pins: GND, VCC, CS, INT1, INT2, SDO, SDA, SCL
• Dimensions: 20 × 15 mm (DFRobot)
• Weight: 6.9 g

Scope of Delivery:

• 1× Fermion ADXL345 breakout