SENS-ADXL345
Accéléromètre ADXL345
ADXL345 3-axes ±16g, I2C/SPI, shock detection — module de prototypage.
Technical analysis
The ADXL345 is the digital "do-it-all" accelerometer: four ranges up to ±16 g, ODR up to 3200 Hz, SPI or I²C, and consumption of a few tens of µA that makes it viable on a battery-powered node. For shock, tilt or threshold-vibration detection at the foot of a machine, it does the job at minimal cost.
Its limit is noise: the datasheet specifies it in LSB rms (not in µg/√Hz density), and it is markedly higher than that of a dedicated CBM sensor. In practice, you detect that "a machine vibrates more than before," but not the fine lines of an incipient bearing fault. As soon as serious spectral analysis is the goal, you move up to the ADXL355. The ADXL345 remains the right choice for broad, cheap instrumentation, or for a first monitoring prototype.
Verified specifications
Every figure below is sourced from the manufacturer datasheet.
- Ranges (selectable)
- ±2 / ±4 / ±8 / ±16 g
- Resolution
- 10 bits fixed (up to 13 bits in full-resolution)
- Output data rate (ODR)
- 6,25 Hz to 3200 Hz
- Interfaces
- SPI (3/4 wire) and I²C
- Supply
- 2,0 V to 3,6 V
- Consumption (measurement)
- 40 µA (<10 Hz) to 145 µA (>100 Hz)
References & standards
📄 Official manufacturer datasheet — Analog Devices
Applicable standards
- ISO 13373 — Usable for vibration screening; the noise (specified in LSB rms, not in µg/√Hz) confines it to screening rather than precision spectral CBM.