The ADXL345 3-Axis Digital Accelerometer is a high-performance, low-power sensing module designed to measure static acceleration (gravity) and dynamic acceleration (motion or shock). At Electrapac, we recommend this sensor for robotics and IoT developers in Bangladesh who need to detect tilt, tap, or free-fall in their Arduino and Raspberry Pi projects.

The ADXL345 is a "Digital" sensor, meaning it converts physical motion into data that your microcontroller can read over a simple 2-wire or 4-wire interface. With a high resolution of 13-bit at $\pm 16g$, it is sensitive enough to detect even the slightest change in inclination (less than 1.0°). Unlike older analog sensors, the ADXL345 features an internal FIFO buffer and "Smart" interrupt pins that can wake up your processor only when a specific movement (like a "double-tap") occurs.

Key Features for Electrapac Customers

• Triple-Axis Sensing: Measures acceleration in the X, Y, and Z planes simultaneously, providing a complete picture of an object's orientation in 3D space.

• Dual Interface (I2C/SPI): Whether you want the simplicity of 2-wire I2C for Arduino or the high-speed 4-wire SPI for Raspberry Pi, this module supports both.

• Built-in Level Shifter: Our module includes an on-board voltage regulator and level shifter, making it safe to use with both 3.3V and 5V microcontrollers.

• Intelligent Interrupts: Features two programmable interrupt pins that can trigger an alarm if the sensor detects an "Activity," "Inactivity," or "Free-fall" event.

• High G-Force Tolerance: Capable of surviving shocks up to 10,000g, ensuring it won't break if your robot or drone accidentally crashes.

To get started with the Electrapac ADXL345 using the I2C interface:

1. VCC: Connect to 5V or 3.3V.

2. GND: Connect to Ground.

3. SDA/SCL: Connect to the I2C pins (A4 and A5 on Arduino Uno).

4. CS Pin: For I2C mode, ensure the CS pin is connected to VCC (high) to select the correct address.

Pro-Tip: If you are building a "Leveling Tool" or a "Digital Spirit Level," use the atan2 math function in your code to convert the X, Y, and Z raw data into actual degrees of tilt. The ADXL345 is incredibly stable for static tilt measurements!

• Drone Stability: Providing tilt feedback to flight controllers to keep quadcopters level during flight.

• Mobile Devices: Detecting "Screen Rotation" or "Shake-to-Wake" gestures in custom-built handheld gadgets.

• Free-Fall Detection: Automatically parking the read/write head of a hard drive or triggering a "Distress Signal" if a person or robot falls.

• Gaming & VR: Using motion tracking for DIY game controllers or virtual reality headsets.

• Pedometer/Step Counter: Utilizing the acceleration peaks to count steps for fitness tracking projects.

We source our ADXL345 Modules with original high-precision ICs to ensure you get low noise and accurate 13-bit resolution. Visit us at www.electrapac.com for the motion-sensing technology that brings 3D awareness to your projects.