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annotate py/fridge.py @ 639:89818a14648b rust tip

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- switch to using anyhow for errors, surf for http runs but surf has problems
author Matt Johnston <matt@ucc.asn.au>
date Thu, 28 Nov 2019 23:57:00 +0800
parents 6848907f85be
children 6087c692d381
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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 import utils
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9
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10 class Fridge(object):
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12 OVERSHOOT_MAX_DIV = 1800.0 # 30 mins
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13
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14 def __init__(self, server, nowait = False):
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15 self.server = server
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16 self.gpio = gpio.Gpio(config.FRIDGE_GPIO_PIN, "fridge")
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17 self.integrator = utils.StepIntegrator(self.server.now, self.server.params.overshoot_delay)
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18 self.wort_valid_clock = 0
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19 self.fridge_on_clock = 0
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20 self.off()
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21 if nowait:
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22 self.fridge_off_clock = 0
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24 def turn(self, value):
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25 self.gpio.turn(value)
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26 self.integrator.turn(value)
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28 def on(self):
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29 self.turn(True)
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31 def off(self):
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32 self.turn(False)
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33 self.fridge_off_clock = self.server.now()
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34
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35 def is_on(self):
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36 return self.gpio.get_state()
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37
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38 @asyncio.coroutine
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39 def run(self):
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40 if self.server.params.disabled:
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41 L("Fridge is disabled")
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42 while True:
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43 try:
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44 self.do()
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45 yield from self.server.sleep(config.FRIDGE_SLEEP)
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46 except Exception as e:
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47 EX("fridge failed")
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48
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49 def do(self):
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50 """ this is the main fridge control logic """
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51 wort, fridge = self.server.current_temps()
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52
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53 params = self.server.params
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54
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55 fridge_min = params.fridge_setpoint - params.fridge_range_lower
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56 fridge_max = params.fridge_setpoint + params.fridge_range_upper
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58 wort_min = params.fridge_setpoint
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59 wort_max = params.fridge_setpoint + params.fridge_difference
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60
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61 off_time = self.server.now() - self.fridge_off_clock
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63 if wort is not None:
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64 self.wort_valid_clock = self.server.now()
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65
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66 self.integrator.set_limit(params.overshoot_delay)
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67
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68 # Safety to avoid bad things happening to the fridge motor (?)
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69 # When it turns off don't start up again for at least FRIDGE_DELAY
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70 if not self.is_on() and off_time < config.FRIDGE_DELAY:
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71 L("fridge skipping, too early")
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72 return
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73