ADXL345 3-Axis Digital Accelerometer Module

The ADXL345 measures acceleration along three axes simultaneously - both the static pull of gravity (useful for tilt sensing) and dynamic motion or vibration - with enough resolution (13-bit, 4mg per step) to distinguish genuinely small changes in orientation, down to roughly a quarter-degree of tilt. That precision is what separates a real accelerometer breakout from a cruder tilt-switch that only reports a binary state.

A selectable measurement range from ±2g up to ±16g lets a project trade sensitivity for headroom - the tightest range for detecting subtle tilt changes, the widest range for capturing hard shocks or vibration without clipping. Dual interface support (I2C and SPI) gives flexibility in wiring depending on what else shares the bus, and operation across both 3.3V and 5V logic covers the two most common microcontroller families without needing a level shifter.

Common uses are tilt-sensing and orientation detection in robotics and handheld devices, basic vibration and impact monitoring, and motion-triggered projects where a simple threshold on acceleration magnitude is enough to detect movement or a bump.