(SKU:RB-02S037)ADXL345 三軸加速度計(jì)
目錄 |
產(chǎn)品概述
ADXL345 數(shù)字三軸加速度計(jì)是一款小而薄的超低功耗3軸加速度計(jì),分辨率高達(dá)(13位),測(cè)量范圍達(dá)± 16g。數(shù)字輸出數(shù)據(jù)為16位二進(jìn)制補(bǔ)碼格式,可通過SPI(3線或4線)或I2C數(shù)字接口訪問。ADXL345非常適合移動(dòng)設(shè)備應(yīng)用。它可以在傾斜檢測(cè)應(yīng)用中測(cè)量靜態(tài)重力加速度,還可以測(cè)量運(yùn)動(dòng)或沖擊導(dǎo)致的動(dòng)態(tài)加速度。其高分辨率(3.9mg/LSB),能夠測(cè)量不到1.0°的傾斜角度變化。該器件提供多種特殊檢測(cè)功能?;顒?dòng)和非活動(dòng)檢測(cè)功能通過比較任意軸上的加速度與用戶設(shè)置的閾值來檢測(cè)有無運(yùn)動(dòng)發(fā)生。敲擊檢測(cè)功能可以檢測(cè)任意方向的單振和雙振動(dòng)作。自由落體檢測(cè)功能可以檢測(cè)器件是否正在掉落。這些功能可以獨(dú)立映射到兩個(gè)中斷輸出引腳中的一個(gè)。正在申請(qǐng)專利的集成式存儲(chǔ)器管理系統(tǒng)采用一個(gè)32級(jí)先進(jìn)先出(FIFO)緩沖器,可用于存儲(chǔ)數(shù)據(jù),從而將主機(jī)處理器負(fù)荷降至最低,并降低整體系統(tǒng)功耗。低功耗模式支持基于運(yùn)動(dòng)的智能電源管理,從而以極低的功耗進(jìn)行閾值感測(cè)和運(yùn)動(dòng)加速度測(cè)量。
規(guī)格參數(shù)
- 工作電壓:3.3-5v
- 超低功耗:測(cè)量模式下40uA電流損耗,待機(jī)模式下0.1uA@2.5v
- 通訊接口:I2C、SPI(3線or4線)
- 接口類型:0.1"插針孔
接線方法
ADXL345 | Arduino |
VCC | 3V3 |
GND | GND |
CS | 3V3 |
SDO | GND |
SDA | A4 |
SCL | A5 |
實(shí)物接線圖:
例子程序
#include <Wire.h> #define DEVICE (0x53) //ADXL345 device address #define TO_READ (6) //num of bytes we are going to read each time (two bytes for each axis) byte buff[TO_READ] ; //6 bytes buffer for saving data read from the device char str[512]; //string buffer to transform data before sending it to the serial port void setup() { Wire.begin(); // join i2c bus (address optional for master) Serial.begin(9600); // start serial for output //Turning on the ADXL345 writeTo(DEVICE, 0x2D, 0); writeTo(DEVICE, 0x2D, 16); writeTo(DEVICE, 0x2D, 8); } void loop() { int regAddress = 0x32; //first axis-acceleration-data register on the ADXL345 int x, y, z; readFrom(DEVICE, regAddress, TO_READ, buff); //read the acceleration data from the ADXL345 //each axis reading comes in 10 bit resolution, ie 2 bytes. Least Significat Byte first!! //thus we are converting both bytes in to one int x = (((int)buff[1]) << 8) | buff[0]; y = (((int)buff[3])<< 8) | buff[2]; z = (((int)buff[5]) << 8) | buff[4]; //we send the x y z values as a string to the serial port sprintf(str, "%d %d %d", x, y, z); Serial.print(str); Serial.write(10); //It appears that delay is needed in order not to clog the port delay(50); } //---------------- Functions //Writes val to address register on device void writeTo(int device, byte address, byte val) { Wire.beginTransmission(device); //start transmission to device Wire.write(address); // send register address Wire.write(val); // send value to write Wire.endTransmission(); //end transmission } //reads num bytes starting from address register on device in to buff array void readFrom(int device, byte address, int num, byte buff[]) { Wire.beginTransmission(device); //start transmission to device Wire.write(address); //sends address to read from Wire.endTransmission(); //end transmission Wire.beginTransmission(device); //start transmission to device Wire.requestFrom(device, num); // request 6 bytes from device int i = 0; while(Wire.available()) //device may send less than requested (abnormal) { buff[i] = Wire.read(); // receive a byte i++; } Wire.endTransmission(); //end transmission }
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相關(guān)問題解答
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相關(guān)學(xué)習(xí)資料
視頻: AS-4WD輪式機(jī)器人三軸加速度計(jì)操控功能演示
視頻:Arduino ADXL345 三軸加速度計(jì)
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