Mercurial > templog
annotate py/fridge.py @ 219:16a83e2c97a0
sleep on a semaphore so it can start/stop immediately when there's a SIGHUP
from the web UI. makes it seem more magical.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 19 Dec 2014 21:52:50 +0800 |
| parents | 3f187baa3439 |
| children | 251524081924 |
| 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 |
| 144 | 10 def __init__(self, server): |
| 11 gevent.Greenlet.__init__(self) | |
| 12 self.server = server | |
| 141 | 13 self.setup_gpio() |
| 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() |
| 141 | 17 |
| 18 def setup_gpio(self): | |
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19 dir_fn = '%s/direction' % config.FRIDGE_GPIO |
| 145 | 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 |
| 148 | 23 self.value_file = open(val_fn, 'r+') |
| 141 | 24 |
| 25 def turn(self, value): | |
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26 self.value_file.seek(0) |
| 141 | 27 if value: |
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28 self.value_file.write('1') |
| 141 | 29 else: |
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30 self.value_file.write('0') |
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31 self.value_file.flush() |
| 141 | 32 |
| 33 def on(self): | |
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34 self.turn(True) |
| 141 | 35 |
| 36 def off(self): | |
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37 self.turn(False) |
| 141 | 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 |
| 144 | 49 # greenlet subclassed |
| 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: |
| 144 | 54 self.do() |
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55 self.server.sleep(config.FRIDGE_SLEEP) |
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56 |
| 145 | 57 def do(self): |
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58 """ this is the main fridge control logic """ |
| 144 | 59 wort, fridge = self.server.current_temps() |
| 141 | 60 |
| 145 | 61 params = self.server.params |
| 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 |
| 144 | 69 off_time = self.server.now() - self.fridge_off_clock |
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70 |
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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: |
| 141 | 75 L("fridge skipping, too early") |
| 76 return | |
| 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 |
| 141 | 84 # handle broken wort sensor |
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85 if wort is None: |
| 144 | 86 invalid_time = self.server.now() - self.wort_valid_clock |
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87 W("Invalid wort sensor for %d secs" % invalid_time) |
| 141 | 88 if invalid_time < config.FRIDGE_WORT_INVALID_TIME: |
| 89 W("Has only been invalid for %d, waiting" % invalid_time) | |
| 90 return | |
| 91 | |
| 92 if fridge is None: | |
| 93 W("Invalid fridge sensor") | |
| 94 | |
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95 if self.is_on(): |
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96 turn_off = False |
| 144 | 97 on_time = self.server.now() - self.fridge_on_clock |
| 141 | 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 |
| 163 | 104 D("on_time %(on_time)f, overshoot %(overshoot)f" % locals()) |
| 141 | 105 |
| 178 | 106 if not params.nowort and wort is not None: |
| 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 |
| 141 | 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() |
| 144 | 119 self.fridge_off_clock = self.server.now() |
| 141 | 120 |
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121 else: |
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122 # fridge is off |
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123 turn_on = False |
| 168 | 124 if not params.nowort \ |
| 125 and wort is not None \ | |
| 126 and wort >= wort_max: | |
| 163 | 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() |
| 158 | 136 self.fridge_on_clock = self.server.now() |