Mercurial > ~darius > hgwebdir.cgi > beermon
annotate MonitorDev.py @ 15:0ec70371cfcf
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| author | darius |
|---|---|
| date | Tue, 29 Jan 2008 11:27:20 +0000 |
| parents | 8ada8d5cca15 |
| children | 67a4dc218bbf |
| rev | line source |
|---|---|
| 6 | 1 #!/usr/bin/env python |
| 2 | |
| 3 ############################################################################ | |
| 4 # Monitoring/control interface to hardware for beermon | |
| 5 # | |
|
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8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
10
diff
changeset
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6 # $Id: MonitorDev.py,v 1.3 2007/10/23 01:05:22 darius Exp $ |
| 6 | 7 # |
| 8 # Depends on: Python 2.3 (I think) | |
| 9 # | |
| 10 ############################################################################ | |
| 11 # | |
| 12 # Copyright (C) 2007 Daniel O'Connor. All rights reserved. | |
| 13 # | |
| 14 # Redistribution and use in source and binary forms, with or without | |
| 15 # modification, are permitted provided that the following conditions | |
| 16 # are met: | |
| 17 # 1. Redistributions of source code must retain the above copyright | |
| 18 # notice, this list of conditions and the following disclaimer. | |
| 19 # 2. Redistributions in binary form must reproduce the above copyright | |
| 20 # notice, this list of conditions and the following disclaimer in the | |
| 21 # documentation and/or other materials provided with the distribution. | |
| 22 # | |
| 23 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 24 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 25 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 26 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 27 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 28 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 29 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 30 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 31 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 32 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 33 # SUCH DAMAGE. | |
| 34 # | |
| 35 ############################################################################ | |
| 36 | |
| 37 import threading, re, time, pexpect | |
| 38 | |
|
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8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
10
diff
changeset
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39 class OWReadError(Exception): |
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8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
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diff
changeset
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40 """Raised when we failed to read from a 1-wire device, could be a timeout |
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8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
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diff
changeset
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41 or the device is non-existent, etc""" |
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8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
10
diff
changeset
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42 pass |
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8ada8d5cca15
Move OWReadError to MonitorDev since that's where it's raised.
darius
parents:
10
diff
changeset
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43 |
| 6 | 44 class MonitorDev(threading.Thread): |
| 45 """This class continually polls the hardware for temperature | |
| 46 readings and accepts state changes to heat & cool""" | |
| 47 | |
| 48 # Match a ROM ID (eg 00:11:22:33:44:55:66:77) | |
| 49 romre = re.compile('([0-9a-f]{2}:){7}[0-9a-f]{2}') | |
| 50 # Match the prompt | |
| 51 promptre = re.compile('> ') | |
| 52 | |
| 53 # Dictionary of sensor IDs & temperatures | |
| 54 temps = {} | |
| 55 # Dictionary of sensor IDs & epoch times | |
| 56 lastUpdate = {} | |
| 57 | |
| 58 # List of all device IDs | |
| 59 devs = [] | |
| 60 # List of temperature sensor IDs | |
| 61 tempdevs = [] | |
| 62 | |
| 63 # Lock to gate access to the comms | |
| 64 commsLock = None | |
| 65 | |
| 66 currState = 'idle' | |
| 67 | |
| 68 lastHeatOn = 0 | |
| 69 lastHeatOff = 0 | |
| 70 lastCoolOn = 0 | |
| 71 lastCoolOff = 0 | |
| 72 | |
| 73 def __init__(self, _log, conf): | |
| 10 | 74 """_log is a logging object, conf is a ConfigParser object""" |
| 6 | 75 global log |
| 76 log = _log | |
| 77 threading.Thread.__init__(self) | |
| 78 | |
| 79 # Collect parameters | |
| 80 self.coolRelay = conf.getint('hardware', 'coolRelay') | |
| 81 self.heatRelay = conf.getint('hardware', 'heatRelay') | |
| 82 self.fermenterId = conf.get('hardware', 'fermenterId') | |
| 83 self.fridgeId = conf.get('hardware', 'fridgeId') | |
| 84 self.ambientId = conf.get('hardware', 'ambientId') | |
| 85 self.minCoolOnTime = conf.getfloat('hardware', 'minCoolOnTime') | |
| 86 self.minCoolOffTime = conf.getfloat('hardware', 'minCoolOffTime') | |
| 87 self.minHeatOnTime = conf.getfloat('hardware', 'minHeatOnTime') | |
| 88 self.minHeatOffTime = conf.getfloat('hardware', 'minHeatOffTime') | |
| 89 self.minHeatOvershoot = conf.getfloat('hardware', 'minHeatOvershoot') | |
| 90 self.minCoolOvershoot = conf.getfloat('hardware', 'minCoolOvershoot') | |
| 91 | |
| 92 # Setup locking & spawn SSH | |
| 93 self.commsLock = threading.Lock() | |
| 94 self.p = pexpect.spawn('/usr/bin/ssh', ['-xt', '-enone', '-i', '/home/darius/.ssh/id_wrt', 'root@wrt', '(echo logged in; microcom -D/dev/cua/1)']) | |
| 95 assert(self.p.expect('logged in') == 0) | |
| 96 self.p.timeout = 3 | |
| 97 self.setspeed() | |
| 98 | |
| 99 # Search for 1-wire modules | |
| 100 self.devs = self.find1wire() | |
| 101 self.tempdevs = filter(self.istemp, self.devs) | |
| 102 | |
| 103 log.debug("fermenterId - %s" % (self.fermenterId)) | |
| 104 log.debug("fridgeId - %s" % (self.fridgeId)) | |
| 105 log.debug("ambientId - %s" % (self.ambientId)) | |
| 106 log.debug("minCoolOnTime - %d, minCoolOffTime - %d" % | |
| 107 (self.minCoolOnTime, self.minCoolOffTime)) | |
| 108 log.debug("minHeatOnTime - %d, minHeatOffTime - %d" % | |
| 109 (self.minHeatOnTime, self.minHeatOffTime)) | |
| 110 log.debug("minHeatOvershoot - %3.2f, minCoolOvershoot - %3.2f" % | |
| 111 (self.minHeatOvershoot, self.minCoolOvershoot)) | |
| 112 self.start() | |
| 113 | |
| 114 def setspeed(self): | |
| 10 | 115 """Set the speed microcom talks to the serial port to 38400""" |
| 6 | 116 self.commsLock.acquire() |
| 117 self.p.send('~') | |
| 118 assert(self.p.expect('t - set terminal') == 0) | |
| 119 self.p.send('t') | |
| 120 assert(self.p.expect('p - set speed') == 0) | |
| 121 self.p.send('p') | |
| 122 assert(self.p.expect('f - 38400') == 0) | |
| 123 self.p.send('f') | |
| 124 assert(self.p.expect('done!') == 0) | |
| 125 self.commsLock.release() | |
| 126 | |
| 127 def find1wire(self): | |
| 10 | 128 """Scan the bus for 1-wire devices""" |
| 6 | 129 self.commsLock.acquire() |
| 130 self.p.sendline('') | |
| 131 assert(self.p.expect('> ') == 0) | |
| 132 self.p.sendline('sr') | |
| 133 # Echo | |
| 134 assert(self.p.expect('sr') == 0) | |
| 135 | |
| 136 # Send a new line which will give us a command prompt to stop on | |
| 137 # later. We could use read() but that would make the code a lot | |
| 138 # uglier | |
| 139 self.p.sendline('') | |
| 140 | |
| 141 devlist = [] | |
| 142 | |
| 143 # Loop until we get the command prompt (> ) collecting ROM IDs | |
| 144 while True: | |
| 145 idx = self.p.expect([self.romre, self.promptre]) | |
| 146 if (idx == 0): | |
| 147 # Matched a ROM | |
| 148 #print "Found ROM " + self.p.match.group() | |
| 149 devlist.append(self.p.match.group(0)) | |
| 150 elif (idx == 1): | |
| 151 # Matched prompt, exit | |
| 152 break | |
| 153 else: | |
| 154 # Unpossible! | |
| 155 self.commsLock.release() | |
| 156 raise SystemError() | |
| 157 | |
| 158 self.commsLock.release() | |
| 159 | |
| 160 return(devlist) | |
| 161 | |
| 162 def istemp(self, id): | |
| 10 | 163 """Returns true if the 1-wire device is a temperature sensor""" |
| 6 | 164 [family, a, b, c, d, e, f, g] = id.split(':') |
| 165 if (family == '10'): | |
| 166 return True | |
| 167 else: | |
| 168 return False | |
| 169 | |
| 170 def updateTemps(self): | |
| 10 | 171 """Update our cached copy of temperatures""" |
| 6 | 172 for i in self.tempdevs: |
| 173 try: | |
| 174 self.temps[i] = float(self.readTemp(i)) | |
| 175 self.lastUpdate[i] = time.time() | |
| 176 except OWReadError: | |
| 177 # Ignore this - just results in no update reflected by lastUpdate | |
| 178 pass | |
| 179 | |
| 180 return(self.temps) | |
| 181 | |
| 182 def readTemp(self, id): | |
| 10 | 183 """Read the temperature of a sensor""" |
| 6 | 184 self.commsLock.acquire() |
| 185 cmd = 'te ' + id | |
| 186 self.p.sendline(cmd) | |
| 187 # Echo | |
| 188 assert(self.p.expect(cmd) == 0) | |
| 189 # Eat EOL left from expect | |
| 190 self.p.readline() | |
| 191 | |
| 192 line = self.p.readline().strip() | |
| 193 self.commsLock.release() | |
| 194 # 'CRC mismatch' can mean that we picked the wrong ROM.. | |
| 195 if (re.match('CRC mismatch', line) != None): | |
| 196 raise OWReadError | |
| 197 | |
| 198 return(line) | |
| 199 | |
| 200 def setState(self, state): | |
| 10 | 201 """Set the heat/cool state, track the on/off time""" |
| 6 | 202 if (state == 'cool'): |
| 203 relay = 1 << self.coolRelay | |
| 204 elif (state == 'heat'): | |
| 205 relay = 1 << self.heatRelay | |
| 206 elif (state == 'idle'): | |
| 207 relay = 0 | |
| 208 else: | |
| 209 raise(ValueError) | |
| 210 | |
| 211 if (state == self.currState): | |
| 212 return | |
| 213 | |
| 214 # Keep track of when we last turned off or on | |
| 215 if (state == 'cool'): | |
| 216 if (self.currState == 'heat'): | |
| 217 self.lastHeatOff = time.time() | |
| 218 self.lastCoolOn = time.time() | |
| 219 elif (state == 'heat'): | |
| 220 if (self.currState == 'cool'): | |
| 221 self.lastCoolOff = time.time() | |
| 222 self.lastHeatOn = time.time() | |
| 223 else: | |
| 224 if (self.currState == 'cool'): | |
| 225 self.lastCoolOff = time.time() | |
| 226 if (self.currState == 'heat'): | |
| 227 self.lastHeatOff = time.time() | |
| 228 | |
| 229 self.currState = state | |
| 230 | |
| 231 self.commsLock.acquire() | |
| 232 # Need the extra spaces cause the parser in the micro is busted | |
| 233 cmd = 'out c %02x' % relay | |
| 234 self.p.sendline(cmd) | |
| 235 # Echo | |
| 236 assert(self.p.expect(cmd) == 0) | |
| 237 self.commsLock.release() | |
| 238 | |
| 239 def run(self): | |
| 10 | 240 """Sit in a loop polling temperatures""" |
| 6 | 241 while True: |
| 242 self.updateTemps() | |
| 243 |