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8
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1 #!/usr/bin/env python
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2
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3 ############################################################################
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4 # Control class for beermon
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5 #
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12
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6 # $Id: Control.py,v 1.2 2007/09/29 14:51:20 darius Exp $
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8
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7 #
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8 # Depends on: Python 2.3 (I think)
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9 #
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10 ############################################################################
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11 #
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12 # Copyright (C) 2007 Daniel O'Connor. All rights reserved.
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13 #
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14 # Redistribution and use in source and binary forms, with or without
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15 # modification, are permitted provided that the following conditions
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16 # are met:
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17 # 1. Redistributions of source code must retain the above copyright
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18 # notice, this list of conditions and the following disclaimer.
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19 # 2. Redistributions in binary form must reproduce the above copyright
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20 # notice, this list of conditions and the following disclaimer in the
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21 # documentation and/or other materials provided with the distribution.
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22 #
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23 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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24 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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27 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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28 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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29 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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30 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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32 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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33 # SUCH DAMAGE.
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34 #
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35 ############################################################################
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36
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37 import threading, ConfigParser, time
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38
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39 class OWReadError(Exception):
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40 """Raised when we failed to read from a 1-wire device, could be a timeout
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41 or the device is non-existent, etc"""
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42 pass
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43
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44 class ThreadDied(Exception):
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45 """Raised when the monitor thread has died for some reason"""
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46 pass
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47
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48 class Control():
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49 """This class is responsible for controlling the temperature of
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50 the fermenter by switching the heater & cooler."""
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51 staleDataTime = 30
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52
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53 def __init__(self, _log, m, conf):
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12
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54 """m is a MonitorDev object, _log is a logging object, conf is a ConfigParser object"""
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8
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55 global log
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56 log = _log
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57
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58 self.m = m
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59
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60 self.targetTemp = conf.getfloat('control', 'targetTemp')
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61 self.hysteresis = conf.getfloat('control', 'hysteresis')
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62 self.pollInterval = conf.getfloat('control', 'pollInterval')
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63
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64 log.debug("target temperature - %3.2f" % (self.targetTemp))
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65 log.debug("hysteresis - %3.2f" % (self.hysteresis))
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66 log.debug("pollInterval - %d" % (self.pollInterval))
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67
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68 # We sleep on this, using time.sleep() doesn't work well in a
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69 # threaded environment (eg ctrl-c will be blocked until the
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70 # timeout expires.)
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8
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71 self.cv = threading.Condition()
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72 self.cv.acquire()
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73
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74 def doit(self):
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75 """Runs forever controlling the temperature until something breaks or interrupted"""
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76 log.debug("=== Starting ===")
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77 log.debug("Fermenter Fridge Ambient State New State")
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78 while True:
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12
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79 # Check if the monitor thread has died
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8
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80 if (not self.m.isAlive()):
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81 raise ThreadDied, "Monitor thread has died"
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82
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83 # Check for stale data
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84 if (self.m.lastUpdate[self.m.fermenterId] + self.staleDataTime < time.time()):
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85 log.debug("Stale data")
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86 self.cv.wait(self.pollInterval)
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87 self.m.setState('idle')
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88 continue
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89
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90 # Work out what state we should go into
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91 nextState = "-"
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92 # Temperature diff, -ve => too cold, +ve => too warm
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93 diff = self.m.temps[self.m.fermenterId] - self.targetTemp
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94 if (self.m.currState == 'idle'):
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95 # If we're idle then only heat or cool if the temperate difference is out of the
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96 # hysteresis band
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97 if (abs(diff) > self.hysteresis):
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98 if (diff < 0 and self.m.minHeatOffTime + self.m.lastHeatOff < time.time()):
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99 nextState = 'heat'
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100 elif (diff > 0 and self.m.minHeatOffTime + self.m.lastHeatOff < time.time()):
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101 nextState = 'cool'
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102 elif (self.m.currState == 'cool'):
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103 # Work out if we should go idle (based on min on time & overshoot)
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104 if (diff + self.m.minCoolOvershoot < 0 and self.m.minCoolOnTime + self.m.lastCoolOn < time.time()):
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105 nextState = 'idle'
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106 elif (self.m.currState == 'heat'):
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107 # Ditto
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108 if (diff - self.m.minHeatOvershoot > 0 and self.m.minHeatOnTime + self.m.lastHeatOn < time.time()):
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109 nextState = 'idle'
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110 else:
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111 # Not possible..
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112 raise KeyError
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113
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114 log.debug("%3.2f %3.2f %3.2f %s %s" %
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115 (self.m.temps[self.m.fermenterId],
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116 self.m.temps[self.m.fridgeId], self.m.temps[self.m.ambientId],
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117 self.m.currState, nextState))
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118
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119 if (nextState != "-"):
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120 self.m.setState(nextState)
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121
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122 self.cv.wait(self.pollInterval)
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123
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124
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