Matrix - 3-Axis Digital Accelerometer

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1 Introduction

3-Axis Digital Accelerometer

三轴重力加速度主要功能是用作测量x\y\z方向上的速度，可利用测量到的速度计算当前角度。模块可以使用IIC或SPI进行通信。此配件搭载了一颗ADXL345芯片。ADXL345是Anolog Device公司的三轴数字重力传感器，13-bit精度，采集范围可以是+-2g，+-4g，+-8g和+-16g，通讯方式为SPI或I2C。配件采用5V供电，PCB上的电源转换芯片输出3.3V给ADXL345。

2 Features

• SPI/I2C，3.3V
• 13-bit，up to +-16g
• 2.54mm spacing pin interface

3 How To

3.1 Connection

• Connect Tiny4412 SDK (1506)

GND: Ground

VCC: 5V

INT2：N/A

INT1: N/A

CS: 5V

SCL: I2C SCL

SDA: I2C SDA

SDO: 5V for slave address

3.2 Code Sample in C Under Linux

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libfahw-adxl34x.h"
 
int main(int argc, char ** argv)
{
    char *position = (char *) malloc(32);
    memset(position, 0, 32);
 
    if (adxl34xRead(position) > 0) {
        printf("Get position: %s", position);
    } else {
        printf("Fail to get position\n");
    }
    free(position);
    return 0;
}

3.3 Compile and Run

git clone http://github.com/friendlyarm/fa-hardware.git
cd fa-hardware
cd demo
cd matrix-3_axis_digital_accelerometer
make

Copy your compiled bin to your board and you are ready to go.