-
Notifications
You must be signed in to change notification settings - Fork 0
/
brewer.py
186 lines (163 loc) · 6.29 KB
/
brewer.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
from raspi import ArduinoAPI, DummySerial, Serial
import json
import sys
import time
from pprint import pprint
from datetime import datetime, timedelta
class Brewer(object):
STATE_STOPPED = 0
STATE_LOADING = 1
STATE_MASH_HEATING = 2
STATE_ADD_GRAIN = 3
STATE_MASHING = 4
STATE_REMOVE_GRAIN = 5
STATE_BRING_TO_BOIL = 6
STATE_BOILING = 7
STATE_START_COOLING = 8
STATE_COOLING = 9
STATE_DONE = 10
transitions = {
STATE_STOPPED: STATE_LOADING,
STATE_LOADING: STATE_MASH_HEATING,
STATE_MASH_HEATING: STATE_ADD_GRAIN,
STATE_ADD_GRAIN: STATE_MASHING,
STATE_MASHING: STATE_REMOVE_GRAIN,
STATE_REMOVE_GRAIN: STATE_BRING_TO_BOIL,
STATE_BRING_TO_BOIL: STATE_BOILING,
STATE_BOILING: STATE_START_COOLING,
STATE_START_COOLING: STATE_COOLING,
STATE_COOLING: STATE_DONE
}
def __init__(self, recipe):
self.recipe = recipe
self.ser = Serial()
self.api = ArduinoAPI(self.ser)
self.state = Brewer.STATE_STOPPED
self.desired_temp = 0
self.end_time = None
self.mash_index = -1
self.boil_done_time = None
def start(self):
print "Starting recipe"
water_volume = self.recipe['mash']['water_volume']
msg1 = "Load %d l water" % water_volume
msg2 = "Then press enter"
self.api.set_lcd_message(msg1, msg2)
self.state = Brewer.STATE_LOADING
self.api.wait_for_button()
mash_temp = self.recipe['mash']['temp']
msg1 = "Heating to %dC" % mash_temp
msg2 = ""
self.api.set_lcd_message(msg1, msg2)
self.desired_temp = mash_temp
self.state = Brewer.STATE_MASH_HEATING
self._ensure_heater_state(True, True)
self._run()
def _ensure_heater_state(self, st1, st2):
if self.api.heaters[0] != st1:
self.api.set_heater_status(0, st1)
print "Turning heater %d %s" % (0, st1 and "ON" or "OFF")
if self.api.heaters[1] != st2:
self.api.set_heater_status(1, st2)
print "Turning heater %d %s" % (1, st2 and "ON" or "OFF")
def _check_heating(self):
if self.api.temp < self.desired_temp:
print "Desired temp: %d Actual temp: %d" % (self.desired_temp, self.api.temp)
# ensure heaters are on
self._ensure_heater_state(True, True)
return False
else:
return True
def _check_mash_state(self):
now = datetime.utcnow()
if self.end_time is not None and now < self.end_time:
if self.api.temp < self.desired_temp:
self._ensure_heater_state(True, True)
elif self.api.temp > self.desired_temp:
self._ensure_heater_state(False, False)
else:
if self.mash_index == len(self.recipe['mash']['rests']) - 1:
return True
else:
self.mash_index += 1
rest = self.recipe['mash']['rests'][self.mash_index]
self.end_time = now + timedelta(seconds=rest['duration'])
self.desired_temp = rest['temp']
print "Starting mash rest - temp: %dC duration: %d minutes" % (rest['temp'], rest['duration'])
def _check_boiling(self):
now = datetime.utcnow()
if self.boil_done_time is None:
duration = self.recipe['boil_duration']
self.boil_done_time = now + timedelta(seconds=duration)
self.hop_index = 0
if self.api.temp < 95:
self._ensure_heater_state(True, True)
else:
self._ensure_heater_state(True, False)
h = self.recipe["hops"][self.hop_index]
t = timedelta(seconds=h["when"])
ts = self.boil_done_time - t
if now > ts:
msg1 = "Add to boiler:"
msg2 = h["what"]
self.api.set_lcd_message(msg1, msg2)
self.api.wait_for_button()
self.hop_index += 1
if self.hop_index >= len(self.recipe["hops"]):
return True
return False
def _check_cooling(self):
self._ensure_heater_state(False, False)
desired_temp = self.recipe["final_temp"]
if self.api.temp <= desired_temp:
print "Reached %dC" % desired_temp
return True
else:
print "Desired temp: %d Actual temp: %d" % (self.desired_temp, self.api.temp)
return False
def _next(self):
self.state = Brewer.transitions[self.state]
def _run(self):
while self.state != Brewer.STATE_DONE:
self.ser.check_messages()
if self.state in (Brewer.STATE_MASH_HEATING,):
if self._check_heating():
self._next()
elif self.state in (Brewer.STATE_ADD_GRAIN, Brewer.STATE_REMOVE_GRAIN):
msg1 = ""
msg2 = ""
if self.state == Brewer.STATE_ADD_GRAIN:
msg1 = "Add grain bag"
if self.state == Brewer.STATE_REMOVE_GRAIN:
msg1 = "Remove grain bag"
self.api.set_lcd_message(msg1, msg2)
self.api.wait_for_button()
self._next()
elif self.state == Brewer.STATE_MASHING:
if self._check_mash_state():
self._next()
elif self.state == Brewer.STATE_BRING_TO_BOIL:
self._ensure_heater_state(True, True)
if self.api.temp >= 22:
self._next()
elif self.state == Brewer.STATE_BOILING:
if self._check_boiling():
self._next()
elif self.state == Brewer.STATE_START_COOLING:
msg1 = "Cooling to %dC" % self.recipe['final_temp']
msg2 = ""
self.api.set_lcd_message(msg1, msg2)
self._next()
elif self.state == Brewer.STATE_COOLING:
if self._check_cooling():
self._next()
time.sleep(1)
self._ensure_heater_state(False, False) # just in case
print "Done brewing. Enjoy!"
if __name__ == '__main__':
recipe_file = open('dummy_recipe.json')
recipe = json.load(recipe_file)
pprint(recipe)
recipe_file.close()
b = Brewer(recipe)
b.start()