Testing out the PPD42 Air Quality Sensor, with an MSP430 Launchpad and graphing the data with GNUplot.
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#!/usr/bin/python
'''
Original data collection script by Ben Kenney - July 2012
This program reads data coming from the serial port and saves that data to a text file. It expects data in the following format with a comma (,) as a separator:
"value1,value2"
It assumes that the Arduino shows up in /dev/ttyACM0 on the Raspberry Pi which should happen if you're using Debian.
'''
import serial
from time import strftime
from datetime import datetime, time
ser = serial.Serial('/dev/ttyACM0',9600)
startTime = datetime.now()
try:
while 1:
line=ser.readline().rstrip()
# temp,outsidetemp=line.split(",")
# we have more data.
# I don't know what they are yet...
read1,read2,read3=line.split(",");
now = datetime.now()
elapsedTime = now-startTime
elapsedSeconds = (elapsedTime.microseconds+(elapsedTime.days*24*3600+elapsedTime.seconds)*10**6)/10**6
#this is the original
#
# f=open('/home/pi/sensors/sensordata/temperaturedata.csv','a')
#
f=open('./temperaturedata.csv','a')
print >>f,("%s,%s,%s,%s,%s"%(now.strftime("%Y-%m-%d %H:%M:%S"),elapsedSeconds,read1,read2,read3))
f.close()
except KeyboardInterrupt:
print "\ndone"