Product Description The ADXL345 3-Axis Digital Accelerometer is a sophisticated, ultra-low power motion sensor designed for high-resolution applications. Unlike analog accelerometers, the ADXL345 provides a digital output through I2C or SPI protocols, allowing for more precise data transfer without the electrical noise issues common in analog signals. It features an adjustable measurement range up to ±16g and is capable of measuring both static acceleration (gravity) for tilt-sensing and dynamic acceleration from motion or shock. Its advanced features, such as tap and double-tap detection, activity/inactivity monitoring, and free-fall sensing, make it a top choice at Robogears for mobile devices, gaming systems, and impact detection systems.
Key Highlights
Adjustable Sensitivity: Users can switch between ±2g, ±4g, ±8g, and ±16g ranges via software, making it versatile for everything from slow tilt sensing to high-impact monitoring.
High Resolution: Offers 13-bit resolution at all g-ranges, maintaining a constant scale factor of approximately 4mg/LSB.
Smart Power Management: Includes a FIFO (First In, First Out) buffer and special interrupt modes (like free-fall or tap detection) that allow the main microcontroller to sleep until motion is detected, significantly saving battery life.
Dual Interface Support: Compatible with both I2C and SPI communication, providing flexibility based on your project’s wiring complexity and speed requirements.
Compact Integration: The small board includes an onboard 3.3V regulator and level-shifting components, allowing it to work safely with both 3.3V and 5V logic levels.
Technical Specifications
Supply Current: 40 μA in measurement mode, 0.1 μA in standby mode.
Operating Temperature: -40°C to +85°C.
Output Data Rate: 0.1 Hz to 3200 Hz.
Shock Survival: 10,000g.
Dimensions: ~20mm x 15mm.
Installation Tip from Robogears The ADXL345 defaults to the I2C address 0x53. If you are using I2C with an Arduino, connect the SDA pin to A4 and SCL to A5 (or the dedicated SDA/SCL pins). For the best performance in tilt sensing, perform a simple calibration by placing the sensor flat on a level surface and recording the "offset" values to subtract from your readings. If you need extremely high-speed data acquisition (e.g., for vibration analysis), we recommend using the SPI interface instead of I2C.
Note: This product is the ADXL345 sensor module ONLY. Header pins may need to be soldered. Product images are for illustration purposes only.
