Mercurial > templog
annotate py/fridge.py @ 166:5d5424acfed0
- use the fridge temperature for control too, keep it in a 6deg band
- ignore params beginning with _
| author | Matt Johnston <matt@ucc.asn.au> |
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| date | Mon, 18 Feb 2013 23:31:32 +0800 |
| parents | bf2a17873ba1 |
| children | bfc3213edee4 |
| rev | line source |
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1 # -*- coding: utf-8 -*- |
| 163 | 2 from utils import L,W,E,EX,D |
| 141 | 3 import config |
| 144 | 4 import gevent |
| 141 | 5 |
| 144 | 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 = 3 # ºC |
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10 FRIDGE_AIR_MAX_RANGE = 3 |
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11 |
| 144 | 12 def __init__(self, server): |
| 13 gevent.Greenlet.__init__(self) | |
| 14 self.server = server | |
| 141 | 15 self.setup_gpio() |
| 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 = server.now() |
| 141 | 19 |
| 20 def setup_gpio(self): | |
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21 dir_fn = '%s/direction' % config.FRIDGE_GPIO |
| 145 | 22 with open(dir_fn, 'w') as f: |
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23 f.write('low') |
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24 val_fn = '%s/value' % config.FRIDGE_GPIO |
| 148 | 25 self.value_file = open(val_fn, 'r+') |
| 141 | 26 |
| 27 def turn(self, value): | |
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28 self.value_file.seek(0) |
| 141 | 29 if value: |
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30 self.value_file.write('1') |
| 141 | 31 else: |
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32 self.value_file.write('0') |
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33 self.value_file.flush() |
| 141 | 34 |
| 35 def on(self): | |
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36 self.turn(True) |
| 141 | 37 |
| 38 def off(self): | |
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39 self.turn(False) |
| 141 | 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 |
| 144 | 51 # greenlet subclassed |
| 52 def _run(self): | |
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53 if self.server.params.disabled: |
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54 L("Fridge is disabled") |
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55 while True: |
| 144 | 56 self.do() |
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57 gevent.sleep(config.FRIDGE_SLEEP) |
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58 |
| 145 | 59 def do(self): |
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60 """ this is the main fridge control logic """ |
| 144 | 61 wort, fridge = self.server.current_temps() |
| 141 | 62 |
| 145 | 63 params = self.server.params |
| 64 | |
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65 fridge_min = params.fridge_setpoint - self.FRIDGE_AIR_MIN_RANGE |
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66 fridge_max = params.fridge_setpoint + self.FRIDGE_AIR_MAX_RANGE |
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67 |
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68 wort_min = params.fridge_setpoint |
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69 wort_max = params.fridge_setpoint + params.fridge_difference |
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70 |
| 144 | 71 off_time = self.server.now() - self.fridge_off_clock |
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72 |
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73 if off_time < config.FRIDGE_DELAY: |
| 141 | 74 L("fridge skipping, too early") |
| 75 return | |
| 76 | |
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77 if params.disabled: |
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78 if self.is_on(): |
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79 L("Disabled, turning fridge off") |
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80 self.off() |
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81 return |
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82 |
| 141 | 83 # handle broken wort sensor |
| 84 if wort is not None: | |
| 144 | 85 self.wort_valid_clock = self.server.now() |
| 141 | 86 else: |
| 87 W("Invalid wort sensor") | |
| 144 | 88 invalid_time = self.server.now() - self.wort_valid_clock |
| 141 | 89 if invalid_time < config.FRIDGE_WORT_INVALID_TIME: |
| 90 W("Has only been invalid for %d, waiting" % invalid_time) | |
| 91 return | |
| 92 | |
| 93 if fridge is None: | |
| 94 W("Invalid fridge sensor") | |
| 95 | |
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96 if self.is_on(): |
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97 turn_off = False |
| 144 | 98 on_time = self.server.now() - self.fridge_on_clock |
| 141 | 99 |
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100 overshoot = 0 |
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101 if on_time > params.overshoot_delay: |
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102 overshoot = params.overshoot_factor \ |
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103 * min(self.OVERSHOOT_MAX_DIV, on_time) \ |
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104 / self.OVERSHOOT_MAX_DIV |
| 163 | 105 D("on_time %(on_time)f, overshoot %(overshoot)f" % locals()) |
| 141 | 106 |
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107 if wort is not None and (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 turn_off = True |
| 141 | 113 |
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114 if turn_off: |
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115 L("Turning fridge off") |
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116 self.off() |
| 144 | 117 self.fridge_off_clock = self.server.now() |
| 141 | 118 |
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119 else: |
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120 # fridge is off |
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121 turn_on = False |
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122 if wort is not None and wort >= wort_max: |
| 163 | 123 L("Wort is too hot %f, max %f" % (wort, wort_max)) |
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124 turn_on = True |
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125 elif fridge is not None and fridge >= fridge_max: |
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126 W("frdge on fallback, fridge %(fridge)f, max %(fridge_max)f" % locals()) |
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127 turn_on = True |
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128 |
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129 if turn_on: |
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130 L("Turning fridge on") |
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131 self.on() |
| 158 | 132 self.fridge_on_clock = self.server.now() |