Mercurial > ~darius > hgwebdir.cgi > beermon
annotate Control.py @ 14:8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
| author | darius |
|---|---|
| date | Tue, 23 Oct 2007 01:05:21 +0000 |
| parents | 24c7e85c3efd |
| children | 0ec70371cfcf |
| rev | line source |
|---|---|
| 6 | 1 #!/usr/bin/env python |
| 2 | |
| 3 ############################################################################ | |
| 4 # Control class for beermon | |
| 5 # | |
|
14
8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
10
diff
changeset
|
6 # $Id: Control.py,v 1.3 2007/10/23 01:05:21 darius Exp $ |
| 6 | 7 # |
| 8 # Depends on: Python 2.3 (I think) | |
| 9 # | |
| 10 ############################################################################ | |
| 11 # | |
| 12 # Copyright (C) 2007 Daniel O'Connor. All rights reserved. | |
| 13 # | |
| 14 # Redistribution and use in source and binary forms, with or without | |
| 15 # modification, are permitted provided that the following conditions | |
| 16 # are met: | |
| 17 # 1. Redistributions of source code must retain the above copyright | |
| 18 # notice, this list of conditions and the following disclaimer. | |
| 19 # 2. Redistributions in binary form must reproduce the above copyright | |
| 20 # notice, this list of conditions and the following disclaimer in the | |
| 21 # documentation and/or other materials provided with the distribution. | |
| 22 # | |
| 23 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 24 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 25 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 26 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 27 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 28 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 29 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 30 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 31 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 32 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 33 # SUCH DAMAGE. | |
| 34 # | |
| 35 ############################################################################ | |
| 36 | |
| 37 import threading, ConfigParser, time | |
| 38 | |
| 39 class ThreadDied(Exception): | |
| 40 """Raised when the monitor thread has died for some reason""" | |
| 41 pass | |
| 42 | |
| 43 class Control(): | |
| 44 """This class is responsible for controlling the temperature of | |
| 45 the fermenter by switching the heater & cooler.""" | |
| 46 staleDataTime = 30 | |
| 47 | |
| 48 def __init__(self, _log, m, conf): | |
| 10 | 49 """m is a MonitorDev object, _log is a logging object, conf is a ConfigParser object""" |
| 6 | 50 global log |
| 51 log = _log | |
| 52 | |
| 53 self.m = m | |
| 54 | |
| 55 self.targetTemp = conf.getfloat('control', 'targetTemp') | |
| 56 self.hysteresis = conf.getfloat('control', 'hysteresis') | |
| 57 self.pollInterval = conf.getfloat('control', 'pollInterval') | |
| 58 | |
| 59 log.debug("target temperature - %3.2f" % (self.targetTemp)) | |
| 60 log.debug("hysteresis - %3.2f" % (self.hysteresis)) | |
| 61 log.debug("pollInterval - %d" % (self.pollInterval)) | |
| 62 | |
| 10 | 63 # We sleep on this, using time.sleep() doesn't work well in a |
| 64 # threaded environment (eg ctrl-c will be blocked until the | |
| 65 # timeout expires.) | |
| 6 | 66 self.cv = threading.Condition() |
| 67 self.cv.acquire() | |
| 68 | |
| 69 def doit(self): | |
| 70 """Runs forever controlling the temperature until something breaks or interrupted""" | |
| 71 log.debug("=== Starting ===") | |
| 72 log.debug("Fermenter Fridge Ambient State New State") | |
| 73 while True: | |
| 10 | 74 # Check if the monitor thread has died |
| 6 | 75 if (not self.m.isAlive()): |
| 76 raise ThreadDied, "Monitor thread has died" | |
| 77 | |
| 78 # Check for stale data | |
| 79 if (self.m.lastUpdate[self.m.fermenterId] + self.staleDataTime < time.time()): | |
| 80 log.debug("Stale data") | |
| 81 self.cv.wait(self.pollInterval) | |
| 82 self.m.setState('idle') | |
| 83 continue | |
| 84 | |
| 85 # Work out what state we should go into | |
| 86 nextState = "-" | |
| 87 # Temperature diff, -ve => too cold, +ve => too warm | |
| 88 diff = self.m.temps[self.m.fermenterId] - self.targetTemp | |
| 89 if (self.m.currState == 'idle'): | |
| 90 # If we're idle then only heat or cool if the temperate difference is out of the | |
| 91 # hysteresis band | |
| 92 if (abs(diff) > self.hysteresis): | |
| 93 if (diff < 0 and self.m.minHeatOffTime + self.m.lastHeatOff < time.time()): | |
| 94 nextState = 'heat' | |
| 95 elif (diff > 0 and self.m.minHeatOffTime + self.m.lastHeatOff < time.time()): | |
| 96 nextState = 'cool' | |
| 97 elif (self.m.currState == 'cool'): | |
| 98 # Work out if we should go idle (based on min on time & overshoot) | |
| 99 if (diff + self.m.minCoolOvershoot < 0 and self.m.minCoolOnTime + self.m.lastCoolOn < time.time()): | |
| 100 nextState = 'idle' | |
| 101 elif (self.m.currState == 'heat'): | |
| 102 # Ditto | |
| 103 if (diff - self.m.minHeatOvershoot > 0 and self.m.minHeatOnTime + self.m.lastHeatOn < time.time()): | |
| 104 nextState = 'idle' | |
| 105 else: | |
| 106 # Not possible.. | |
| 107 raise KeyError | |
| 108 | |
| 109 log.debug("%3.2f %3.2f %3.2f %s %s" % | |
| 110 (self.m.temps[self.m.fermenterId], | |
| 111 self.m.temps[self.m.fridgeId], self.m.temps[self.m.ambientId], | |
| 112 self.m.currState, nextState)) | |
| 113 | |
| 114 if (nextState != "-"): | |
| 115 self.m.setState(nextState) | |
| 116 | |
| 117 self.cv.wait(self.pollInterval) | |
| 118 | |
| 119 |