mma7660.py

import smbus
import time
import os
import math

# Define a class for the accelerometer readings
class MMA7660():
    bus = smbus.SMBus(1)
    def __init__(self):
        self.bus.write_byte_data(0x4c, 0x07, 0x00) # Setting up MODE to Stand by to set SR
        self.bus.write_byte_data(0x4c, 0x06, 0x10) # Calibrate
        self.bus.write_byte_data(0x4c, 0x08, 0x00) # Setting up SR register to 120 samples active and auto sleep mode
        self.bus.write_byte_data(0x4c, 0x07, 0x01) # Setting up MODE Active to START measures
    def getXYZ(self):
        val = [0 for i in range(3)]
	val[0] = val[1] = val[2] = 64
        count = 0
        val = self.bus.read_i2c_block_data(0x4c, 0x00)
        return val

mma = MMA7660()

for a in range(1000):
    x,y,z = mma.getXYZ()[:3]              
    x, y, z = x*4,y*4,z*4

    if x>127:
    	x = x-256
    if y>127:
        y=y-256
    if z>127:
        z=z-256

    print("X=", x)
    print("Y=", y)
    print("Z=", z)

    time.sleep(0.2)
    os.system("clear")