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annotate py/fridge.py @ 442:02318c9660cd

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copied fridge logic from main.c
author Matt Johnston <matt@ucc.asn.au>
date Tue, 20 Nov 2012 22:03:10 +0800
parents 31ac84425a2d
children 482d7852b511
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1 # -*- coding: utf-8 -*-
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2 from utils import L,W,E
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3 import config
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4
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5 class Fridge(object):
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6
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7 OVERSHOOT_MAX_DIV = 1800.0 # 30 mins
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8 FRIDGE_AIR_MIN_RANGE = 4 # ºC
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9 FRIDGE_AIR_MAX_RANGE = 4
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10
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11 def __init__(self):
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12 self.setup_gpio()
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13 self.wort_valid_clock = 0
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14 self.fridge_on_clock = 0
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15 self.fridge_off_clock = 0
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16
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17 def setup_gpio(self):
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18 dir_fn = '%s/direction' % config.FRIDGE_GPIO
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19 with f = open(dir_fn, 'w'):
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20 f.write('low')
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21 val_fn = '%s/value' % config.FRIDGE_GPIO
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22 self.value_file = f.open(val_fn, 'r+')
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23
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24 def turn(self, value):
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25 self.value_file.seek(0)
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26 if value:
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27 self.value_file.write('1')
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28 else:
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29 self.value_file.write('0')
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30 self.value_file.flush()
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31
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32 def on(self):
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33 self.turn(True)
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34
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35 def off(self):
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36 self.turn(False)
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37
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38 def is_on(self):
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39 self.value_file.seek(0)
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40 buf = self.value_file.read().strip()
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41 if buf == '0':
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42 return False
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43 if buf != '1':
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44 E("Bad value read from gpio '%s': '%s'"
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45 % (self.value_file.name, buf))
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46 return True
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47
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48 def run(self, server):
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49
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50 while True:
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51 self.do(server)
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52 gevent.sleep(config.FRIDGE_SLEEP)
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53
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54 def do(self, server):
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55 """ this is the main fridge control logic """
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56 wort, fridge, ambient = server.current_temps()
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57
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58 fridge_min = params.fridge_setpoint - self.FRIDGE_AIR_MIN_RANGE
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59 fridge_max = params.fridge_setpoint + self.FRIDGE_AIR_MAX_RANGE
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60
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61 wort_max = params.fridge_setpoint + params.fridge_difference
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62
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63 off_time = server.now() - self.fridge_off_clock
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64
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65 if off_time < config.FRIDGE_DELAY:
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66 L("fridge skipping, too early")
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67 return
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68
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69 # handle broken wort sensor
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70 if wort is not None:
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71 self.wort_valid_clock = server.now()
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72 else:
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73 W("Invalid wort sensor")
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74 invalid_time = server.now() - self.wort_valid_clock
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75 if invalid_time < config.FRIDGE_WORT_INVALID_TIME:
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76 W("Has only been invalid for %d, waiting" % invalid_time)
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77 return
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78
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79 if fridge is None:
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80 W("Invalid fridge sensor")
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81
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82 if self.is_on():
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83 turn_off = False
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84 on_time = server.now() - self.fridge_on_clock
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85
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86 overshoot = 0
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87 if on_time > params.overshoot_delay:
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88 overshoot = params.overshoot_factor \
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89 * min(self.OVERSHOOT_MAX_DIV, on_time) \
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90 / self.OVERSHOOT_MAX_DIV
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91 L("on_time %(on_time)f, overshoot %(overshoot)f" % locals())
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92
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93 if wort is not None:
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94 if (wort - overshoot) < params.fridge_setpoint:
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95 L("wort has cooled enough")
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96 turn_off = True
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97 else:
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98 # wort sensor is broken
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99 if fridge is not None and last_fridge < fridge_min:
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100 W("fridge off fallback")
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101 turn_off = True
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102
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103 if turn_off:
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104 L("Turning fridge off")
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105 self.off()
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106 self.fridge_off_clock = server.now()
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107
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108 else:
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109 # fridge is off
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110 turn_on = False
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111 if wort is not None:
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112 if wort >= wort_max:
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113 L("Wort is too hot")
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114 turn_on = True
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115 else:
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116 # wort sensor is broken
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117 if fridge is not None and fridge >= fridge_max:
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118 W("frdge on fallback")
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119 turn_on = True
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120
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121 if turn_on:
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122 L("Turning fridge on")
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123 self.on()
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124 fridge_on_clock = server.now()