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#!/usr/bin/env python

# -*- coding: utf-8 -*-

#

# untitled.py

#

# Copyright 2013 Scott Thomson <scott@scott-Aspire-6930G>

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

# MA 02110-1301, USA.

#

#

import quick2wire.i2c as i2c

import time

import math

adc_address1 = 0x68

adc_address2 = 0x69

varDivisior = 64 # from pdf sheet on adc addresses and config

varMultiplier = (2.4705882/varDivisior)/1000

with i2c.I2CMaster() as bus:

def changechannel(address, adcConfig):

bus.transaction(i2c.writing_bytes(address, adcConfig))

def getadcreading(address):

h, m, l ,s = bus.transaction(i2c.reading(address,4))[0]

while (s & 128):

h, m, l, s = bus.transaction(i2c.reading(address,4))[0]

# shift bits to product result

t = ((h & 0b00000001) << 16) | (m << 8) | l

# check if positive or negative number and invert if needed

if (h > 128):

t = ~(0x020000 - t)

return t * varMultiplier

changechannel(adc_address2, 0xBC)

VoltSup = getadcreading(adc_address2)

def calcCFM(inval):

return (((((((inval) / VoltSup ) - 0.04) / 0.09) / 0.249088908333)**(.5)) * 4005) * 0.2; #0.2 is orifice area in sq ft set to variable in real world use

def calcWc(inval):

return ((((inval) / VoltSup ) - 0.04) / 0.09) / 0.249088908333;

while True:

changechannel(adc_address1, 0x9C)

print ("Flow Velocity CFM: %02f" % calcCFM(getadcreading(adc_address1)))

changechannel(adc_address1, 0xBC)

print ("WC inch H2O: %02f" % calcWc(getadcreading(adc_address1)))

time.sleep(1)== '__main__':

main()