├── README.md
├── niku-circuit.png
├── niku-impl.png
├── niku-rp2.fzz
├── niku.py
└── setup.py


/README.md:
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 1 | # niku.py - PID Controller for sous vide
 2 | 
 3 | ## Hardware
 4 | 
 5 | ![circuit](niku-circuit.png)
 6 | ![impl](niku-impl.png)
 7 | 
 8 | ## Usage
 9 | 
10 | $ niku 60
11 | 


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/niku-circuit.png:
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https://raw.githubusercontent.com/hamano/python-niku/52f47c7608aecb5365707572be5370439dd75e7b/niku-circuit.png


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/niku-impl.png:
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https://raw.githubusercontent.com/hamano/python-niku/52f47c7608aecb5365707572be5370439dd75e7b/niku-impl.png


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/niku-rp2.fzz:
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https://raw.githubusercontent.com/hamano/python-niku/52f47c7608aecb5365707572be5370439dd75e7b/niku-rp2.fzz


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/niku.py:
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 1 | #!/usr/bin/env python
 2 | 
 3 | import sys
 4 | import time
 5 | import glob
 6 | import RPi.GPIO as GPIO
 7 | 
 8 | devices = glob.glob('/sys/bus/w1/devices/*/w1_slave')
 9 | if len(devices) == 0:
10 |     raise Exception("DS18B20 not found.")
11 | elif len(devices) > 1:
12 |     raise Exception("multiple 1-wire devices found.")
13 | 
14 | DEVICE_FILE = devices[0]
15 | GPIO_RELAY = 21
16 | DEBUG = False
17 | 
18 | 
19 | def read_temp():
20 |     file = open(DEVICE_FILE)
21 |     lines = file.readlines()
22 |     temp = lines[1].split('t=')[1]
23 |     return float(temp) / 1000
24 | 
25 | 
26 | def output(power):
27 |     if power > 1:
28 |         power = 1
29 |     on = power * 10
30 |     off = (1 - power) * 10
31 |     if on > 0:
32 |         GPIO.output(GPIO_RELAY, GPIO.HIGH)
33 |         time.sleep(on)
34 |     if off > 0:
35 |         GPIO.output(GPIO_RELAY, GPIO.LOW)
36 |         time.sleep(off)
37 | 
38 | 
39 | def p(temp, target, kp):
40 |     d = target - temp
41 |     if d < 0:
42 |         return 0
43 |     power = d / target * kp
44 |     return power
45 | 
46 | 
47 | def i(hist, target, ki):
48 |     s = 0
49 |     for i in range(len(hist)-1):
50 |         d1 = target - hist[i]
51 |         d2 = target - hist[i+1]
52 |         s += (d1 + d2) / 2 * ki
53 |     return s
54 | 
55 | 
56 | def main():
57 |     if len(sys.argv) < 2:
58 |         print('usafge: %s TARGET_TEMPERTURE' % (sys.argv[0]))
59 |         sys.exit(0)
60 |     target = float(sys.argv[1])
61 |     GPIO.setwarnings(False)
62 |     GPIO.setmode(GPIO.BCM)
63 |     GPIO.setup(GPIO_RELAY, GPIO.OUT)
64 |     hist = []
65 |     prev = 0
66 |     t = 0
67 |     while True:
68 |         try:
69 |             temp = read_temp()
70 |         except Exception as e:
71 |             print(e)
72 |             time.sleep(1)
73 |             continue
74 |         hist.insert(0, temp)
75 |         if len(hist) > 7:
76 |             hist.pop()
77 |         pg = p(temp, target, 3)
78 |         ig = i(hist, target, 0.01)
79 |         if DEBUG:
80 |             print("pg: %f" % (pg))
81 |             print("ig: %f" % (ig))
82 |             print(hist)
83 |         power = pg + ig
84 |         if power > 0:
85 |             power += 0.1
86 |         prev = temp
87 |         print t, temp, power
88 |         sys.stdout.flush()
89 |         output(power)
90 |         t += 10
91 | 
92 | 
93 | if __name__ == "__main__":
94 |     main()
95 | 


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/setup.py:
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 1 | #!/usr/bin/env python
 2 | # -*- coding: utf-8 -*-
 3 | 
 4 | from setuptools import setup
 5 | 
 6 | setup(
 7 |     name='niku',
 8 |     version='2.0.1',
 9 |     description="PID Controller for sous vide",
10 |     url="http://www.cuspy.org/diary/raspberrypi-roastbeef/",
11 |     author = "Tsukasa Hamano",
12 |     author_email = "code@cuspy.org",
13 |     entry_points="""
14 | [console_scripts]
15 | niku = niku:main
16 | """,
17 |     py_modules=['niku'],
18 |     license="BSD",
19 | )
20 | 


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