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annotate py/fridge.py @ 264:205809a8872f

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integer division
author Matt Johnston <matt@ucc.asn.au>
date Sat, 13 Jun 2015 21:56:51 +0800
parents 26eee8591f61
children 20c89630be6c
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1 # -*- coding: utf-8 -*-
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2 import asyncio
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3
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4 from utils import L,W,E,EX,D
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5 import config
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6
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7 import gpio
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8
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9 class Fridge(object):
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10
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11 OVERSHOOT_MAX_DIV = 1800.0 # 30 mins
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12
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13 def __init__(self, server):
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14 self.server = server
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15 self.gpio = gpio.Gpio(config.FRIDGE_GPIO_PIN, "fridge")
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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.off()
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19
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20 def turn(self, value):
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21 self.gpio.turn(value)
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22
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23 def on(self):
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24 self.turn(True)
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25 pass
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27 def off(self):
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28 self.turn(False)
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29 self.fridge_off_clock = self.server.now()
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30
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31 def is_on(self):
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32 return self.gpio.get_state()
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33
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34 @asyncio.coroutine
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35 def run(self):
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36 if self.server.params.disabled:
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37 L("Fridge is disabled")
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38 while True:
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39 try:
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40 self.do()
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41 yield from self.server.sleep(config.FRIDGE_SLEEP)
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42 except Exception as e:
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43 EX("fridge failed")
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44
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45 def do(self):
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46 """ this is the main fridge control logic """
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47 wort, fridge = self.server.current_temps()
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48
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49 params = self.server.params
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50
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51 fridge_min = params.fridge_setpoint - params.fridge_range_lower
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52 fridge_max = params.fridge_setpoint + params.fridge_range_upper
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53
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54 wort_min = params.fridge_setpoint
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55 wort_max = params.fridge_setpoint + params.fridge_difference
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56
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57 off_time = self.server.now() - self.fridge_off_clock
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58
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59 if wort is not None:
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60 self.wort_valid_clock = self.server.now()
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61
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62 # Safety to avoid bad things happening to the fridge motor (?)
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63 # When it turns off don't start up again for at least FRIDGE_DELAY
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64 if not self.is_on() and off_time < config.FRIDGE_DELAY:
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65 L("fridge skipping, too early")
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66 return
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67
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68 if params.disabled:
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69 if self.is_on():
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70 L("Disabled, turning fridge off")
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71 self.off()
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72 return
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73
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74 # handle broken wort sensor
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75 if wort is None:
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76 invalid_time = self.server.now() - self.wort_valid_clock
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77 W("Invalid wort sensor for %d secs" % invalid_time)
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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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82 if fridge is None:
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83 W("Invalid fridge sensor")
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84
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85 D("fridge on %s" % self.is_on())
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86
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87 if self.is_on():
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88 turn_off = False
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89 on_time = self.server.now() - self.fridge_on_clock
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91 overshoot = 0
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92 if on_time > params.overshoot_delay:
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93 overshoot = params.overshoot_factor \
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94 * min(self.OVERSHOOT_MAX_DIV, on_time) \
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95 / self.OVERSHOOT_MAX_DIV
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96 D("on_time %(on_time)f, overshoot %(overshoot)f" % locals())
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97
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98 if not params.nowort and wort is not None:
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99 if wort - overshoot < params.fridge_setpoint:
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100 L("wort has cooled enough, %(wort)f" % locals() )
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101 turn_off = True
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102 elif fridge is not None and fridge < fridge_min:
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103 W("fridge off fallback, fridge %(fridge)f, min %(fridge_min)f" % locals())
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104 if wort is None:
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105 W("wort has been invalid for %d" % (self.server.now() - self.wort_valid_clock))
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106 turn_off = True
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107
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108 if turn_off:
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109 L("Turning fridge off")
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110 self.off()
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111
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112 else:
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113 # fridge is off
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114 turn_on = False
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115 D("fridge %(fridge)s max %(fridge_max)s wort %(wort)s wort_max %(wort_max)s" % locals())
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116 if not params.nowort \
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117 and wort is not None \
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118 and wort >= wort_max:
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119 L("Wort is too hot %f, max %f" % (wort, wort_max))
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120 turn_on = True
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121 elif fridge is not None and fridge >= fridge_max:
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122 W("frdge on fallback, fridge %(fridge)f, max %(fridge_max)f" % locals())
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123 turn_on = True
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124
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125 if turn_on:
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126 L("Turning fridge on")
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127 self.on()
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128 self.fridge_on_clock = self.server.now()