# change '.txt' to '.py' for execution

##automatic data aquisition unit program
## Ext-ins technologies

import smbus
import serial
import time

b = smbus.SMBus(1)
b.write_byte_data(0x20,0xff,0xff)
b.read_byte(0x20)
#write_i2c_block_data(0x20,

ser = serial.Serial(
    port='/dev/ttyUSB0',
    baudrate=9600,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS,
    timeout=1)
#b.write_byte_data(0x20,0xff,0xff)

fid= open('file.txt', 'w')
y=-1
x=0
print ('press <CTRL> + c once to stop (may take a while)')
#for x in xrange(1,1000):
try:
    while True:
        x=x+1
        if y < 4: y=y+1
        else: y = 0; time.sleep(600) #tijd stussen de volgende metingen

        if x==100:
            fid.flush()
            print ('file flushed')
            
        b.write_byte_data(0x20,~(1<<y),~(1<<y) )
        time.sleep(2)
        ser.write('XALL?\n\r')
        s=ser.readline()
        print(s + str(x))
        dat=s[0:len(s)-1]
        T = time.strftime("%a, %d %b %Y %H:%M:%S")
        fid.write(dat +',' + T + ',' +str(x) +'\n')
        #print(str(x))

except KeyboardInterrupt:
    pass
print ('stopped')
fid.close()
ser.close()