How to Use Adafruit ADXL375: Examples, Pinouts, and Specs

The Adafruit ADXL375 (Manufacturer Part ID: 5374) is a high-performance 3-axis accelerometer with a digital output. It is designed for low power consumption and high sensitivity, making it ideal for motion detection, orientation sensing, and impact monitoring. This accelerometer is capable of measuring acceleration up to ±200g, making it suitable for applications requiring high dynamic range and precision.

• Impact and shock detection
• Motion tracking in sports equipment
• Vibration monitoring in industrial systems
• Orientation sensing in robotics and drones
• Wearable devices and fitness trackers

The following table outlines the key technical details of the Adafruit ADXL375:

The Adafruit ADXL375 breakout board has the following pinout:

To use the Adafruit ADXL375 with an Arduino UNO, follow these steps:

1. Wiring:

   • Connect the VIN pin of the ADXL375 to the 3.3V or 5V pin on the Arduino.
   • Connect the GND pin of the ADXL375 to the GND pin on the Arduino.
   • For I²C communication:
     • Connect the SDA pin of the ADXL375 to the A4 pin on the Arduino.
     • Connect the SCL pin of the ADXL375 to the A5 pin on the Arduino.
   • For SPI communication:
     • Connect the CS pin of the ADXL375 to a digital pin on the Arduino (e.g., D10).
     • Connect the SDO/ALT pin to D12 (MISO).
     • Connect the SDA pin to D11 (MOSI).
     • Connect the SCL pin to D13 (SCK).

2. Install Required Libraries:

   • Install the Adafruit Unified Sensor library and the Adafruit ADXL375 library from the Arduino Library Manager.

3. Example Code: Below is an example of how to read acceleration data using I²C communication:

   // Include necessary libraries
   #include <Wire.h>
   #include <Adafruit_Sensor.h>
   #include <Adafruit_ADXL375.h>
   
   // Create an ADXL375 object
   Adafruit_ADXL375 accel = Adafruit_ADXL375();
   
   void setup() {
     Serial.begin(9600); // Initialize serial communication
     while (!Serial) {
       delay(10); // Wait for the serial monitor to open
     }
   
     // Initialize the ADXL375
     if (!accel.begin()) {
       Serial.println("Failed to find ADXL375 chip!");
       while (1) {
         delay(10); // Halt execution if initialization fails
       }
     }
     Serial.println("ADXL375 initialized successfully!");
   
     // Set the range to ±200g
     accel.setRange(ADXL375_RANGE_200_G);
     Serial.print("Range set to: ");
     Serial.print(200);
     Serial.println(" g");
   }
   
   void loop() {
     // Read acceleration data
     sensors_event_t event;
     accel.getEvent(&event);
   
     // Print acceleration values
     Serial.print("X: ");
     Serial.print(event.acceleration.x);
     Serial.print(" m/s^2, Y: ");
     Serial.print(event.acceleration.y);
     Serial.print(" m/s^2, Z: ");
     Serial.print(event.acceleration.z);
     Serial.println(" m/s^2");
   
     delay(500); // Delay for readability
   }
   

• Power Supply: Ensure the input voltage is within the specified range (2.0V to 3.6V). Using a voltage regulator is recommended if your power source exceeds this range.
• Pull-Up Resistors: For I²C communication, ensure pull-up resistors (typically 4.7kΩ) are present on the SDA and SCL lines.
• Interrupts: Configure the INT1 and INT2 pins for specific events, such as free-fall detection or activity monitoring, using the library functions.

1. The ADXL375 is not detected by the Arduino:

   • Ensure the wiring is correct and matches the selected communication protocol (I²C or SPI).
   • Verify that the correct I²C address (default: 0x53) is being used in the code.
   • Check for loose connections or damaged wires.

2. Incorrect or unstable acceleration readings:

   • Ensure the ADXL375 is securely mounted to avoid vibrations or movement affecting the readings.
   • Verify that the range is correctly set to ±200g in the code.

3. Interrupts are not triggering:

   • Confirm that the INT1 and INT2 pins are properly connected to the Arduino.
   • Check the interrupt configuration in the code and ensure it matches the desired event.

• Use a multimeter to verify power and ground connections.
• Test the ADXL375 with the Adafruit example sketches to confirm basic functionality.
• If using SPI, ensure the correct SPI mode (Mode 3) is configured in the code.

By following this documentation, you should be able to successfully integrate and use the Adafruit ADXL375 in your projects.