rickkas7 / ADXL362DMA

Library for ADXL362 accelerometer that uses SPI DMA for efficient transfers

ADXL362DMA

Library for ADXL362 accelerometer that uses SPI DMA for efficient transfers

The ADXL362 is an inexpensive 3-DOF ultra-low power accelerometer. It can do movement detection from rest continuously at 270 nA (yes, nano-amps!) and also has a large FIFO that makes it possible to buffer samples while the processor is busy or even sleeping.

The GY362 is a compatible version of the ADXL362 and also works with this library.

• Github repository
• License: MIT (free for use in open or closed source projects, including commercial products)
• Datasheet
• Full browsable API documentation

Usage

Hardware connections

This library uses the ADXL362 in SPI mode.

Breakout	Particle Device	Color	Description
VIN	3V3	Red	3.3V DC Power
GND	GND	Black	Ground
SCL / SCLK	Orange	SPI CLK
SDA / MOSI / SDI	Blue	SPI MOSI
SDO / MISO	Green	SPI MISO
CS	A2	Yellow	SPI Chip Select
INT2	n/c		Interrupt 2 (not used)
INT1	n/c		Interrupt 1 (not used)

Software

Instantiate a global object for the accelerometer. The first parameter is the SPI bus amd the second is the CS line.

ADXL362DMA accel(SPI, A2);

Initialize the chip:

accel.softReset();
while(accel.readStatus() == 0) {
    Log.info("no status yet, waiting for accelerometer");
    delay(1000);
}

Enable measuring mode (it boots into standby mode):

accel.setMeasureMode(true);

}

Read data. There is also a function to read roll and pitch data instead of raw data, see example 4-rollpitch.

int16_t x, y, z;

accel.readXYZ(x, y, z);

Serial.printlnf("%5d %5d %5d", (int)x, (int)y, (int)z);

Version history

0.0.7 (2023-06-02)

• Fixed occasional SOS+1 hard fault at boot when using the class as a globally constructed object.