資料來源:https://www.sparkfun.com/products/9836
This new version adds 2 standoff holes as well as an extra decoupling capacitor. The ADXL345 is a small, thin, low power, 3-axis MEMS accelerometer with high resolution (13-bit) measurement at up to +-16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface.
The ADXL345 is well suited to measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes less than 1.0 degrees;.
Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion and if the acceleration on any axis exceeds a user-set level. Tap sensing detects single and double taps. Free-fall sensing detects if the device is falling. These functions can be mapped to one of two interrupt output pins. An integrated, patent pending 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor intervention. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.
Get Started with the ADXL345 Guide
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這個新版本增加了2支架孔,以及一個額外的去耦電容。該ADXL345是一種小型,薄型,低功耗,3軸MEMS加速度計具有高分辨率(13位)測量高達±16克16位二進制補碼數字輸出數據格式,並通過SPI(3線或4線)或I2C數字接口訪問。
ADXL345非常適合的措施重心在傾斜檢測應用的靜態加速度,以及運動或衝擊導致的動態加速度。它具有高分辨率(4毫克/ LSB),能夠傾斜測量變化小於1.0度;.
提供了幾個特殊的感測功能。活動和非活動傳感檢測存在或缺乏運動,並且,如果在任何軸上的加速度超過用戶設定的水平。點擊傳感檢測單,雙水龍頭。自由落體檢測功能可以檢測設備是否正在下降。這些功能可以被映射到兩個中斷輸出引腳之一。一個綜合的,申請專利的32級先入先出(FIFO)緩衝器,可用於存儲數據,以減少主機處理器介入。低功耗模式使在極低的功耗進行閾值感測和運動加速度測量基於運動的智能電源管理。
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