Vehicle Sound System

vss.py

import subprocess
import time
import fcntl, os

#p = subprocess.Popen(['mplayer', '-slave', '-quiet', 'motor_start.wav'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

#while(True):
#    speedstr = raw_input('rpm: ')
#    print '\r\n'
#    speednum = int(speedstr)
    
#    p.stdin.write('speed_set ' + str(playspeed) + '\n')

#    break

f = open('datastore/data3.json', 'r')

data = []

for line in f:
    sp = line.replace('\n', '').split('=')
    sec = float(sp[0])
    speed = int(sp[1])
    rpm = int(float(sp[2]))

    data.append([sec, speed, rpm])


starttime = time.time()
prevlist = []
index = 0

while(True):
    nowtime = time.time()
    counter = nowtime - starttime

    if index >= len(data):
        break

    if counter > data[index][0]:
        sec = data[index][0]
        speed = data[index][1]
        rpm = data[index][2]
        speedacceleration = 0.0

        if len(prevlist) == 0:
            prevlist.append([sec, speed, rpm])
            continue

        print speed
        difftime = sec - prevlist[-1][0]
        diffspeed = speed - prevlist[-1][1]

        # Increasing Speed
        # Sampling 7 data
        if not diffspeed < 0:
            if len(prevlist) <= 8:
                # Cannot get acceleration
                pass
            else:
                print 'difffff ' + str(prevlist[-1][1] - prevlist[-2][1])
                if len(prevlist) > 8:
                    sumspeed = 0.0
                    sumtime = 0.0

                    for vindex in range(len(prevlist)):
                        if vindex == 0:
                            continue

                        sumtime += prevlist[vindex][0] - prevlist[vindex-1][0]
                        sumspeed += prevlist[vindex][1] - prevlist[vindex-1][1]

                    speedacceleration = (sumspeed / (len(prevlist) - 1)) * (1 / (sumtime / (len(prevlist) - 1)))
                    prevlist.pop(0)
                else:
                    pass
            
            prevlist.append([sec, speed, rpm])
            pass

        print 'acceleration : ' + str(speedacceleration)

        #p.stdin.write('speed_set ' + str(speedacceleration) + '\n')

        prevtime = sec
        prevspeed = speed

        index += 1
 

#for i in range(8000):
#    playspeed = i/2000.0
#    p.stdin.write('speed_set ' + str(playspeed) + '\n')
#    print i
#    time.sleep(0.005)