Step 1: Setting up the Raspberry pi for the ADXL 345
ADXL 345 pin out 圖
RPI GPIO 圖
The ADXL345 supports both I2C and SPI connections, I used I2C, which requires some configuration on the Pi:
使用I2C 來連線.....
Use the GPIO diagram above to help with the wiring
GND - GND
3V - 3V3
SDA - SDA
SCL - SCL
check 一下系統有沒有把I2C關掉
Add the I2C modules to the Pi's configuration:
sudo nano /etc/modules
Then add the following lines:
i2c-bcm2708
i2c-dev
i2c-dev
Remove I2C from the blacklist:
sudo nano /etc/modprobe.d/fbdev-blacklist.conf
Change this:
blacklist i2c-bcm2708
To this:
#blacklist i2c-bcm2708
Reboot to make the changes:
sudo reboot
Step 2: Installing the Stuff
You will need to install smbus:
sudo apt-get install python-smbus i2c-tools git-core
Now test the ADXL345 is found on the I2C bus by running:
sudo i2cdetect -y 1
看的出來address 0x53的地方有device....
如果沒有看到0x53...代表你線接錯了...或是i2c關掉了
Now download from
不太會使用gitcore..... 所以我從網頁右上角有個 Download Zip..... 按下... 然後用ftp 傳到RPI...
cd adxl345-python-master
Then write:
sudo python example.py
If you get 0.000G for all axis then something probably isn't set up correctly.
看一下 example.py
from adxl345 import ADXL345
adxl345 = ADXL345()
axes = adxl345.getAxes(True)
print "ADXL345 on address 0x%x:" % (adxl345.address)
print " x = %.3fG" % ( axes['x'] )
print " y = %.3fG" % ( axes['y'] )
print " z = %.3fG" % ( axes['z'] )
解釋如下 :
#import the adxl345 module
import adxl345
import adxl345
#create ADXL345 object
accel = adxl345.ADXL345()
#get axes as g
axes = accel.getAxes(True)
# to get axes as ms^2 use
axes = accel.getAxes(False)
#put the axes into variables
x = axes['x']
y = axes['y']
z = axes['z']
#print axes
print x
print y
print z
Change the program for fun!
The default range is 2g which means that the maximum G the ADXL345 can measure is 2.048, but at a high degree of sensitivity.
You can change the sensitivity of the ADXL345 by using the .setRange() method of the class.
這邊還有另外一個sample code
Firstly download their file from:
From there download the User manual(Super Kit for Pi) and the Code and Frizting(Super kit for Pi)
會看到兩個code ...
Reference : http://www.instructables.com/id/how-to-use-the-ADXL345-on-Raspberry-pi/
