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annotate service/thermostat/rpi_buttons.py @ 861:10b1e6a1b408

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thermostat program and raspberry pi buttons reader Ignore-this: aed325a19554a509a19747c89079597b darcs-hash:20130210102208-312f9-40fd7de854665d9f78e4788ddb4ea15062d52614
author drewp <drewp@bigasterisk.com>
date Sun, 10 Feb 2013 02:22:08 -0800
parents
children cbc557c35121
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rev   line source
861
10b1e6a1b408 thermostat program and raspberry pi buttons reader
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1 #!/usr/bin/python3
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2 """
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3 read button and knob on rpi, send back to thermostat program
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4 """
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5 from RPi.GPIO import setmode, PUD_UP, setup, BCM, IN, input as pinInput
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6 import time, json
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7 # using a copy of urllib/request.py from py3.3 which supports 'method'
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8 from request import urlopen, Request
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9
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10 requestedTemperature = 'http://bang.bigasterisk.com:10001/requestedTemperature'
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11 requestOpts = dict(headers={'user-agent': 'rpi buttons'})
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12
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13 def getRequestedTemp():
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14 return (json.loads(urlopen(
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15 Request(requestedTemperature, **requestOpts)).read().decode('utf-8'))
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16 )['tempF']
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17
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18 def setRequestedTemp(f):
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19 urlopen(Request(url=requestedTemperature,
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20 method='PUT',
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21 data=json.dumps({'tempF' : f}).encode('utf-8'),
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22 **requestOpts))
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23
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24 PIN_KNOB_A = 1
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25 PIN_KNOB_B = 4
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26 PIN_BUTTON = 0
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27
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28 setmode(BCM)
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29 setup(PIN_KNOB_A, IN, PUD_UP)
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30 setup(PIN_KNOB_B, IN, PUD_UP)
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31 setup(PIN_BUTTON, IN, PUD_UP)
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32
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33 print("reading knob and button, writing to %s" % requestedTemperature)
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34 prev = None
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35 prevButton = 0
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36 buttonHold = 0
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37 step = .05
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38 while True:
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39 a, b = pinInput(PIN_KNOB_A), pinInput(PIN_KNOB_B)
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40 button = not pinInput(PIN_BUTTON)
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41 pos = (b * 2) + (a ^ b)
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42
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43 if prev is None:
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44 prev = pos
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45 dpos = (pos - prev) % 4
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46
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47 if dpos == 1:
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48 print ("up")
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49 setRequestedTemp(getRequestedTemp() + 1)
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50 elif dpos == -1 % 4:
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51 print ("down")
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52 setRequestedTemp(getRequestedTemp() - 1)
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53 else:
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54 pass # 0 or unknown
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55 prev = pos
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56
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57 if button:
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58 buttonHold += 1
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59 if buttonHold == int(.1 / step):
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60 print ("button to", button)
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61 else:
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62 buttonHold = 0
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63
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64 time.sleep(step)