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valve_control.py
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valve_control.py
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#!/usr/bin/env python
import RPi.GPIO as GPIO
from time import sleep
from daemon import runner
import yaml
import threading
import settings
import tornado.ioloop
import tornado.escape
import tornado.web
import os
import glob
class ValveControl():
def _read_temp_raw(self):
f = open(self.device_file, 'r')
lines = f.readlines()
f.close()
return lines
def read_temp(self):
lines = self._read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
# print "CRC ERROR!!!"
sleep(0.2)
lines = self._read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos + 2:]
temp_c = float(temp_string) / 1000.0
# temp_f = temp_c * 9.0 / 5.0 + 32.0
return temp_c
def __init__(self):
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
self.stdin_path = '/dev/null'
self.stdout_path = '/dev/tty'
self.stderr_path = '/dev/tty'
self.pidfile_path = '/var/run/reletherm.pid'
self.pidfile_timeout = 5
self.base_dir = '/sys/bus/w1/devices/'
self.device_folder = glob.glob(self.base_dir + '28*')[0]
self.device_file = self.device_folder + '/w1_slave'
self.config = dict(temp_set=21, temp_delta=0.5, delay=10, missed_delay=5, missed_stabilize_delay=15)
self.curr_temp = 0
self.last_temp = 0
self.missed = False
self.DEBUG = settings.DEBUG
self.WARM = settings.WARM_GPIO
self.COOL = settings.COOL_GPIO
GPIO.cleanup()
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(self.WARM, GPIO.OUT, initial=True)
GPIO.setup(self.COOL, GPIO.OUT, initial=True)
def read_conf_file(self):
f = open(settings.VALVE_CONTROL_CFG, 'r')
self.config = yaml.safe_load(f)
f.close()
def in_range(self, temp):
if (self.config['temp_set'] - self.config['temp_delta']) <= temp <= \
(self.config['temp_set'] + self.config['temp_delta']):
return True
else:
return False
def above_range(self, temp):
if temp > self.config['temp_set'] + self.config['temp_delta']:
return True
else:
return False
def below_range(self, temp):
if temp < self.config['temp_set'] - self.config['temp_delta']:
return True
else:
return False
def is_missed(self):
if self.below_range(self.last_temp) and self.above_range(self.curr_temp):
if self.DEBUG:
print "Missed above!"
self.missed = True
return True
if self.above_range(self.last_temp) and self.below_range(self.curr_temp):
if self.DEBUG:
print "Missed below!"
self.missed = True
return True
if self.in_range(self.last_temp) and not self.in_range(self.curr_temp):
if self.DEBUG:
print "Missed out!"
self.missed = True
return True
return False
def run(self):
self.read_conf_file()
##START REST WEB
rest_app_settings = dict(template_path=settings.TEMPLATE_PATH, static_path=settings.STATIC_PATH,
debug=settings.DEBUG)
rest_app = tornado.web.Application([
(r"/", MainHandler, dict(valvecontroll=self)),
(r"/config", ConfigHandler, dict(valvecontroll=self)),
(r"/temp", TempHandler, dict(valvecontroll=self)),
(r'/static/(.*)', tornado.web.StaticFileHandler),
], **rest_app_settings)
rest_app.listen(8888)
web_thread = threading.Thread(target=tornado.ioloop.IOLoop.instance().start)
web_thread.start()
##
self.curr_temp = self.read_temp()
self.last_temp = self.curr_temp
while True:
self.curr_temp = self.read_temp()
if self.below_range(self.curr_temp):
if self.DEBUG:
print "Lower than temp_set=%r %r" % (self.config['temp_set'], self.curr_temp)
GPIO.output(self.WARM, False)
GPIO.output(self.COOL, True)
if self.missed:
if self.DEBUG:
print "Missed is active so sleep a bit and off the valve!"
sleep(self.config['missed_delay'])
GPIO.output(self.WARM, True)
if self.above_range(self.curr_temp):
if self.DEBUG:
print "Higher than temp_set=%r %r" % (self.config['temp_set'], self.curr_temp)
GPIO.output(self.COOL, False)
GPIO.output(self.WARM, True)
if self.missed:
if self.DEBUG:
print "Missed is active so sleep a bit and off the valve!"
sleep(self.config['missed_delay'])
GPIO.output(self.COOL, True)
if self.in_range(self.curr_temp):
if self.DEBUG:
print "set_temp REACHED! %r %r" % (self.config['temp_set'], self.curr_temp)
GPIO.output(self.WARM, True)
GPIO.output(self.COOL, True)
self.missed = False
if not self.missed:
self.is_missed()
sleep(self.config['delay'])
else:
sleep(self.config['missed_stabilize_delay'])
self.last_temp = self.curr_temp
class MainHandler(tornado.web.RequestHandler):
def initialize(self, valvecontroll):
self.valvecontroll = valvecontroll
def get(self):
self.render('index.html')
class TempHandler(tornado.web.RequestHandler):
def initialize(self, valvecontroll):
self.valvecontroll = valvecontroll
def get(self):
output = tornado.escape.json_encode({'curr_temp': self.valvecontroll.curr_temp})
self.set_header("Content-Type", "application/json")
print output
self.write(output)
class ConfigHandler(tornado.web.RequestHandler):
def initialize(self, valvecontroll):
self.valvecontroll = valvecontroll
self.cfg = self.valvecontroll.config
def get(self):
output = tornado.escape.json_encode(self.valvecontroll.config)
self.set_header("Content-Type", "application/json")
print output
self.write(output)
def post(self):
print "POST body %s " % self.request.body
cf = tornado.escape.json_decode(self.request.body)
self.cfg = dict((k, float(v)) for k, v in cf.iteritems())
print self.cfg
self.valvecontroll.config = self.cfg
# self.write(self.cfg)
self.write(self.valvecontroll.config)
if __name__ == "__main__":
vc = ValveControl()
try:
daemon_runner = runner.DaemonRunner(vc)
daemon_runner.do_action()
finally:
print "Going down!!! ;()"
ioloop = tornado.ioloop.IOLoop.instance()
ioloop.add_callback(lambda x: x.stop(), ioloop)