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annotate py/fridge.py @ 208:ea800fcc1ad4

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improve README
author Matt Johnston <matt@ucc.asn.au>
date Thu, 26 Jun 2014 21:35:23 +0800
parents 3f187baa3439
children 16a83e2c97a0
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1 # -*- coding: utf-8 -*-
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2 from utils import L,W,E,EX,D
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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
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10 def __init__(self, server):
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11 gevent.Greenlet.__init__(self)
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12 self.server = server
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13 self.setup_gpio()
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14 self.wort_valid_clock = 0
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15 self.fridge_on_clock = 0
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16 self.fridge_off_clock = server.now()
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17
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18 def setup_gpio(self):
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19 dir_fn = '%s/direction' % config.FRIDGE_GPIO
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20 with open(dir_fn, 'w') as f:
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21 f.write('low')
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22 val_fn = '%s/value' % config.FRIDGE_GPIO
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23 self.value_file = open(val_fn, 'r+')
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24
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25 def turn(self, value):
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26 self.value_file.seek(0)
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27 if value:
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28 self.value_file.write('1')
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29 else:
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30 self.value_file.write('0')
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31 self.value_file.flush()
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32
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33 def on(self):
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34 self.turn(True)
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35
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36 def off(self):
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37 self.turn(False)
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38
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39 def is_on(self):
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40 self.value_file.seek(0)
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41 buf = self.value_file.read().strip()
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42 if buf == '0':
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43 return False
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44 if buf != '1':
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45 E("Bad value read from gpio '%s': '%s'"
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46 % (self.value_file.name, buf))
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47 return True
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48
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49 # greenlet subclassed
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50 def _run(self):
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51 if self.server.params.disabled:
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52 L("Fridge is disabled")
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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 params = self.server.params
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62
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63 fridge_min = params.fridge_setpoint - params.fridge_range_lower
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64 fridge_max = params.fridge_setpoint + params.fridge_range_upper
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65
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66 wort_min = params.fridge_setpoint
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67 wort_max = params.fridge_setpoint + params.fridge_difference
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68
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69 off_time = self.server.now() - self.fridge_off_clock
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71 if wort is not None:
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72 self.wort_valid_clock = self.server.now()
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73
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74 if off_time < config.FRIDGE_DELAY:
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75 L("fridge skipping, too early")
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76 return
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77
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78 if params.disabled:
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79 if self.is_on():
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80 L("Disabled, turning fridge off")
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81 self.off()
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82 return
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83
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84 # handle broken wort sensor
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85 if wort is None:
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86 invalid_time = self.server.now() - self.wort_valid_clock
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87 W("Invalid wort sensor for %d secs" % invalid_time)
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88 if invalid_time < config.FRIDGE_WORT_INVALID_TIME:
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89 W("Has only been invalid for %d, waiting" % invalid_time)
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90 return
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91
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92 if fridge is None:
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93 W("Invalid fridge sensor")
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94
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95 if self.is_on():
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96 turn_off = False
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97 on_time = self.server.now() - self.fridge_on_clock
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98
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99 overshoot = 0
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100 if on_time > params.overshoot_delay:
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101 overshoot = params.overshoot_factor \
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102 * min(self.OVERSHOOT_MAX_DIV, on_time) \
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103 / self.OVERSHOOT_MAX_DIV
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104 D("on_time %(on_time)f, overshoot %(overshoot)f" % locals())
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105
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106 if not params.nowort and wort is not None:
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107 if wort - overshoot < params.fridge_setpoint:
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108 L("wort has cooled enough, %(wort)f" % locals() )
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109 turn_off = True
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110 elif fridge is not None and fridge < fridge_min:
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111 W("fridge off fallback, fridge %(fridge)f, min %(fridge_min)f" % locals())
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112 if wort is None:
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113 W("wort has been invalid for %d" % (self.server.now() - self.wort_valid_clock))
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114 turn_off = True
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115
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116 if turn_off:
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117 L("Turning fridge off")
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118 self.off()
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119 self.fridge_off_clock = self.server.now()
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120
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121 else:
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122 # fridge is off
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123 turn_on = False
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124 if not params.nowort \
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125 and wort is not None \
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126 and wort >= wort_max:
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127 L("Wort is too hot %f, max %f" % (wort, wort_max))
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128 turn_on = True
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129 elif fridge is not None and fridge >= fridge_max:
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130 W("frdge on fallback, fridge %(fridge)f, max %(fridge_max)f" % locals())
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131 turn_on = True
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132
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133 if turn_on:
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134 L("Turning fridge on")
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135 self.on()
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136 self.fridge_on_clock = self.server.now()