ADXL345 Accelerometer Module
ADXL345 Accelerometer Module
Triple-Axis Motion Sensor High Resolution Low Power
The ADXL345 Accelerometer Module is a 3-axis digital accelerometer used to measure acceleration, tilt, vibration, and orientation of objects. It is built around the Analog Devices ADXL345 Accelerometer sensor chip and communicates with microcontrollers using I2C or SPI interfaces.
This sensor can measure acceleration in X, Y, and Z directions, making it widely used in robotics, motion detection, wearable devices, and IoT projects.
Infographic Overview
Basic Specifications
Feature | Details |
Sensor Type | 3-Axis Digital Accelerometer |
Measurement Range | 2g, 4g, 8g, 1le version) |
Communication | I2C / SPI |
Resolution | 13-bit |
Low Power Mode | Yes |
Main Components
Component | Description |
ADXL345 Sensor Chip | Measures acceleration on three axes |
Voltage Regulator | Stabilizes power supply |
Communication Interface | Supports I2C and SPI communication |
Pin Header | Connects the module to microcontrollers |
Pin Configuration
Pin | Function |
VCC | Power supply |
GND | Ground |
> | I2C clock line |
CS | SPI chip select |
SDO | SPI data output |
INT1 / INT2 | Interrupt outputs |
Working Principle
The module detects motion using micro-electromechanical systems (MEMS) technology.
Step-by-Step Operation
1 Tiny MEMS structures inside the sensor move when acceleration occurs.2 Movement changes the capacitance of internal plates.3 The sensor converts this change into digital acceleration values.4 The data is transmitted to a microcontroller via I2C or SPI.
Axis Measurement Illustration
ADXL345 AccelerometerZ'Y >mmon Applications
Smartphone orientation detection Robot motion sensing Vehicle tilt monitoring Fitness and activity trackers Vibration monitoring systems Gesture-controlled devices
Compatible Microcontrollers
The sensor works easily with:
Arduino Uno
Arduino Nano
ESP32
Raspberry Pi
ADXL345 vs MPU6050
Feature | ADXL345 | MPU6050 |
Sensor Type | Accelerometer | Accelerometer + Gyroscope |
Axis | 3-axis | 6-axis |
Power Consumption | Very Low | Moderate |
Applications |
Advantages
High-resolution motion detection Supports I2C and SPI communication Very low power consumption Compact MEMS design Suitable for wearable and IoT devices
Limitations
Measures acceleration only (no gyroscope) Requires calibration for precise measurements Sensitive to external vibrations
Example DIY Project
Tilt Detection System
Components
ADXL345 Accelerometer Module
Arduino Uno
OLED display
Working
Accelerometer detects tilt movement Ardu