Mercurial > templog
annotate py/sensor_ds18b20.py @ 277:0a1c02160e66
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| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 17 Nov 2015 22:26:35 +0800 |
| parents | 20c89630be6c |
| children | 97d99eb42d27 |
| rev | line source |
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| 141 | 1 #!/usr/bin/env python2.7 |
| 2 | |
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3 import os |
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4 import re |
| 228 | 5 import asyncio |
| 6 import concurrent.futures | |
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7 |
| 144 | 8 import config |
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9 from utils import D,L,W,E,EX |
| 144 | 10 |
| 239 | 11 class SensorDS18B20(object): |
| 144 | 12 |
| 13 THERM_RE = re.compile('.* YES\n.*t=(.*)\n', re.MULTILINE) | |
| 141 | 14 |
| 144 | 15 def __init__(self, server): |
| 16 self.server = server | |
| 228 | 17 self.readthread = concurrent.futures.ThreadPoolExecutor(max_workers=1) |
| 148 | 18 self.master_dir = config.SENSOR_BASE_DIR |
| 144 | 19 |
| 228 | 20 @asyncio.coroutine |
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21 def do(self): |
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22 vals = {} |
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23 for n in self.sensor_names(): |
| 228 | 24 value = yield from self.do_sensor(n) |
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25 if value is not None: |
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26 vals[n] = value |
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27 |
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28 itemp = self.do_internal() |
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29 if itemp: |
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30 vals['internal'] = itemp |
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31 |
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32 self.server.add_reading(vals) |
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33 |
| 228 | 34 @asyncio.coroutine |
| 35 def run(self): | |
| 144 | 36 while True: |
| 228 | 37 yield from self.do() |
| 259 | 38 yield from asyncio.sleep(config.SENSOR_SLEEP) |
| 144 | 39 |
| 239 | 40 |
| 228 | 41 @asyncio.coroutine |
| 148 | 42 def read_wait(self, f): |
| 228 | 43 # handles a blocking file read with a threadpool. A |
| 44 # real python thread performs the read while other | |
| 45 # asyncio tasks keep running. | |
| 148 | 46 # the ds18b20 takes ~750ms to read, which is noticable |
| 47 # interactively. | |
| 228 | 48 loop = asyncio.get_event_loop() |
| 239 | 49 return loop.run_in_executor(None, f.read) |
| 141 | 50 |
| 228 | 51 @asyncio.coroutine |
| 148 | 52 def do_sensor(self, s, contents = None): |
| 53 """ contents can be set by the caller for testing """ | |
| 144 | 54 try: |
| 55 if contents is None: | |
| 148 | 56 fn = os.path.join(self.master_dir, s, 'w1_slave') |
| 239 | 57 with open(fn, 'r') as f: |
| 58 contents = yield from self.read_wait(f) | |
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59 |
| 144 | 60 match = self.THERM_RE.match(contents) |
| 61 if match is None: | |
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62 D("no match") |
| 144 | 63 return None |
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64 temp = int(match.groups(1)[0]) / 1000.0 |
| 175 | 65 if temp > 80: |
| 66 E("Problem reading sensor '%s': %f" % (s, temp)) | |
| 67 return None | |
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68 return temp |
| 230 | 69 except Exception as e: |
| 144 | 70 EX("Problem reading sensor '%s': %s" % (s, str(e))) |
| 71 return None | |
| 141 | 72 |
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73 def do_internal(self): |
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74 try: |
| 239 | 75 with open(config.INTERNAL_TEMPERATURE, 'r') as f: |
| 76 return int(f.read()) / 1000.0 | |
| 230 | 77 except Exception as e: |
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78 EX("Problem reading internal sensor: %s" % str(e)) |
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79 return None |
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80 |
| 144 | 81 |
| 82 def sensor_names(self): | |
| 83 """ Returns a sequence of sensorname """ | |
| 148 | 84 slaves_path = os.path.join(self.master_dir, "w1_master_slaves") |
| 239 | 85 with open(slaves_path, 'r') as f: |
| 86 contents = f.read() | |
| 178 | 87 if 'not found' in contents: |
| 88 E("No W1 sensors found") | |
| 89 return [] | |
| 90 names = contents.split() | |
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91 # only ds18b20 |
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92 names = [n for n in names if n.startswith('28-')] |
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93 return names |
| 141 | 94 |
| 95 def wort_name(self): | |
| 144 | 96 return config.WORT_NAME |
| 141 | 97 |
| 98 def fridge_name(self): | |
| 144 | 99 return config.FRIDGE_NAME |