Python script to parse data from Mindflex headband and convert it into a powerfull EEG device

brain.py

#!/usr/bin/python
import serial
import sys

latestByte  = ('c')
lastByte    = ('c')
inPacket    = False
myPacket    = []
PLENGTH     = 0

EEGVALUES    = []
EEGRAWVALUES = []

def parsePacket():
  if checksum():
    i=1
    while i < len(myPacket) - 1:
      if ord(myPacket[i]) == 0x02:
        POOR_SIGNAL = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x04:
        ATTENTION = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x05:
        MEDITATION = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x16:
        BLINK_STRENGTH = ord(myPacket[i+1])
        i += 2
      elif ord(myPacket[i]) == 0x83:
        for c in xrange(i+1, i+25, 3):
          EEGVALUES.append(ord(myPacket[c]) << 16 | ord(myPacket[c+1]) << 8 | ord(myPacket[c+2]))
        i += 26
      elif ord(myPacket[i]) == 0x80:
        EEGRAWVALUES = ord(myPacket[i+1]) << 8 | ord(myPacket[i+2])
        i += 4
    print "%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d" % (POOR_SIGNAL,ATTENTION,MEDITATION,EEGVALUES[0],EEGVALUES[1],EEGVALUES[2],EEGVALUES[3],EEGVALUES[4],EEGVALUES[5],EEGVALUES[6],EEGVALUES[7])
  else:
    print "Invalid Checksum!"

def checksum():
  x = 0
  for i in range(1, len(myPacket) -1):
    x += ord(myPacket[i])
  return ~(x&255) & 0b11111111 == ord(myPacket[len(myPacket)-1])

def readCSV():
  global myPacket, lastByte, LatestByte, inPacket, PLENGTH
  ser = serial.Serial(
      port=sys.argv[1],
      baudrate=9600,
      parity=serial.PARITY_NONE,
      stopbits=serial.STOPBITS_ONE,
      bytesize=serial.SEVENBITS
  )

  ser.isOpen()
  try:
    while 1 :
      while ser.inWaiting() > 0:
        latestByte = ser.read(1)

        if ord(lastByte) == 170 and ord(latestByte) == 170 and inPacket == False:
          inPacket   = True

        elif len(myPacket) == 1:
          myPacket.append(latestByte)
          PLENGTH = ord(myPacket[0])

        elif inPacket == True:
          myPacket.append(latestByte)
          if len(myPacket) > 169:
            print "Error: Data Error too long!"
            del myPacket[:]
            inPacket = False
            del EEGVALUES[:]
          elif len(myPacket) == PLENGTH + 2:
            parsePacket()
            del myPacket[:]
            inPacket = False
            del EEGVALUES[:]


        lastByte = latestByte

  except KeyboardInterrupt:
    print('Exiting...')
    if ser.isOpen():
      ser.close();
    sys.exit(0)

if len(sys.argv) < 2:
  print "Mindflex datalogger by David gouveia <[email protected]>"
  print "Usage: %s <COM PORT>" % sys.argv[0]
  sys.exit(1)

readCSV()

David, there are two more steps that you need to perform to get raw EEG from the mindflex. First, you need to solder a wire from the B1 test post on the neurosky TGAM to VCC. This puts the device in 57600 baud raw data mode. You should also cut the VCC line to the internal radio to conserve power. Second, you need to set the baud rate on the HC-06 module to 57600 using the serial AT command.

Email me at [email protected] and I’ll send you detailed instructions with pictures.

https://plus.google.com/116437252778485778081/posts/FuKL8HP4NHg?pid=6056542704872053330&oid=116437252778485778081

Will do so when I find the headband! Thanks :)