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annotate py/fridge.py @ 144:482d7852b511

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a bit more, and some tests
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Nov 2012 23:21:03 +0800
parents 0895f5ad7731
children 6517ddee3187
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1 # -*- coding: utf-8 -*-
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2 from utils import L,W,E,EX
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3 import config
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4 import gevent
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5
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6 class Fridge(gevent.Greenlet):
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7
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8 OVERSHOOT_MAX_DIV = 1800.0 # 30 mins
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9 FRIDGE_AIR_MIN_RANGE = 4 # ºC
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10 FRIDGE_AIR_MAX_RANGE = 4
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11
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12 def __init__(self, server):
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13 gevent.Greenlet.__init__(self)
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14 self.server = server
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15 self.setup_gpio()
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16 self.wort_valid_clock = 0
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17 self.fridge_on_clock = 0
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18 self.fridge_off_clock = 0
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19
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20 def setup_gpio(self):
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21 dir_fn = '%s/direction' % config.FRIDGE_GPIO
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22 with f = open(dir_fn, 'w'):
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23 f.write('low')
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24 val_fn = '%s/value' % config.FRIDGE_GPIO
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25 self.value_file = f.open(val_fn, 'r+')
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26
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27 def turn(self, value):
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28 self.value_file.seek(0)
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29 if value:
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30 self.value_file.write('1')
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31 else:
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32 self.value_file.write('0')
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33 self.value_file.flush()
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34
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35 def on(self):
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36 self.turn(True)
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37
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38 def off(self):
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39 self.turn(False)
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40
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41 def is_on(self):
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42 self.value_file.seek(0)
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43 buf = self.value_file.read().strip()
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44 if buf == '0':
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45 return False
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46 if buf != '1':
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47 E("Bad value read from gpio '%s': '%s'"
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48 % (self.value_file.name, buf))
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49 return True
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50
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51 # greenlet subclassed
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52 def _run(self):
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53 while True:
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54 self.do()
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55 gevent.sleep(config.FRIDGE_SLEEP)
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56
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57 def do(self)
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58 """ this is the main fridge control logic """
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59 wort, fridge = self.server.current_temps()
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60
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61 fridge_min = params.fridge_setpoint - self.FRIDGE_AIR_MIN_RANGE
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62 fridge_max = params.fridge_setpoint + self.FRIDGE_AIR_MAX_RANGE
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63
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64 wort_max = params.fridge_setpoint + params.fridge_difference
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65
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66 off_time = self.server.now() - self.fridge_off_clock
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67
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68 if off_time < config.FRIDGE_DELAY:
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69 L("fridge skipping, too early")
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70 return
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71
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72 # handle broken wort sensor
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73 if wort is not None:
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74 self.wort_valid_clock = self.server.now()
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75 else:
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76 W("Invalid wort sensor")
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77 invalid_time = self.server.now() - self.wort_valid_clock
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78 if invalid_time < config.FRIDGE_WORT_INVALID_TIME:
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79 W("Has only been invalid for %d, waiting" % invalid_time)
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80 return
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81
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82 if fridge is None:
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83 W("Invalid fridge sensor")
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84
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85 if self.is_on():
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86 turn_off = False
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87 on_time = self.server.now() - self.fridge_on_clock
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88
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89 overshoot = 0
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90 if on_time > params.overshoot_delay:
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91 overshoot = params.overshoot_factor \
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92 * min(self.OVERSHOOT_MAX_DIV, on_time) \
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93 / self.OVERSHOOT_MAX_DIV
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94 L("on_time %(on_time)f, overshoot %(overshoot)f" % locals())
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95
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96 if wort is not None:
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97 if (wort - overshoot) < params.fridge_setpoint:
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98 L("wort has cooled enough")
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99 turn_off = True
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100 else:
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101 # wort sensor is broken
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102 if fridge is not None and fridge < fridge_min:
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103 W("fridge off fallback")
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104 turn_off = True
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105
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106 if turn_off:
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107 L("Turning fridge off")
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108 self.off()
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109 self.fridge_off_clock = self.server.now()
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110
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111 else:
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112 # fridge is off
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113 turn_on = False
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114 if wort is not None:
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115 if wort >= wort_max:
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116 L("Wort is too hot")
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117 turn_on = True
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118 else:
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119 # wort sensor is broken
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120 if fridge is not None and fridge >= fridge_max:
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121 W("frdge on fallback")
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122 turn_on = True
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123
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124 if turn_on:
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125 L("Turning fridge on")
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126 self.on()
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127 fridge_on_clock = self.server.now()