IoT on Your Raspberry Pi

01 # SunIOT - SwitchDoc Labs
02 #
03 # October 2016
04 #
05 import sys
06 import os
07
08 sys.path.append('./SDL_Pi_SI1145');
09
10 import time
11 import RPi.GPIO as GPIO
12
13 #set up GPIO using BCM numbering
14 GPIO.setmode(GPIO.BCM)
15
16 LED = 4
17 GPIO.setup(LED, GPIO.OUT, initial=0)
18
19 from datetime import datetime
20 from apscheduler.schedulers.background import BackgroundScheduler
21
22 import SDL_Pi_SI1145
23 sensor = SDL_Pi_SI1145.SDL_Pi_SI1145()

01 # setup apscheduler
02
03 def tick():
04     print('Tick! The time is: %s' % datetime.now())
05
06 def killLogger():
07     scheduler.shutdown()
08     print "Scheduler Shutdown...."
09     exit()
10
11 def blinkLED(times,length):
12   for i in range(0, times):
13     GPIO.output(LED, 1)
14     time.sleep(length)
15     GPIO.output(LED, 0)
16     time.sleep(length)
17
18 def readSunLight():
19         vis = sensor.readVisible()
20         IR = sensor.readIR()
21         UV = sensor.readUV()
22         uvIndex = UV / 100.0
23         print('SunLight Sensor read at time: %s' % datetime.now())
24         print '    Vis:             ' + str(vis)
25         print '    IR:              ' + str(IR)
26         print '    UV Index:        ' + str(uvIndex)
27
28   blinkLED(2,0.200)
29
30   returnValue = []
31   returnValue.append(vis)
32   returnValue.append(IR)
33   returnValue.append(uvIndex)
34   return returnValue

01 print "-----------------"
02 print "SunIOT"
03 print ""
04 print "SwitchDoc Labs"
05 print "-----------------"
06 print ""
07
08 if __name__ == '__main__':
09   scheduler = BackgroundScheduler()
10
11   # DEBUG Mode - because the functions run in a separate thread, debugging can be difficult inside the functions.
12   # run the functions here to test them.
13   #tick()
14   #print readSunLight()
15
16   # print out the date and time to console
17   scheduler.add_job(tick, 'interval', seconds=60)
18   # blink life light
19   scheduler.add_job(blinkLED, 'interval', seconds=5, args=[1,0.250])
20
21   # IoT Jobs are scheduled here (more coming next issue)
22   scheduler.add_job(readSunLight, 'interval', seconds=10)
23
24   # start scheduler
25   scheduler.start()
26   print "-----------------"
27   print "Scheduled Jobs"
28   print "-----------------"
29   scheduler.print_jobs()
30   print "-----------------"
31
32   print('Press Ctrl+{0} to exit'.format('Break' if os.name == 'nt' else 'C'))
33
34   try:
35     # This is here to simulate application activity (which keeps the main thread alive).
36     while True:
37       time.sleep(2)
38   except (KeyboardInterrupt, SystemExit):
39     # Not strictly necessary if daemonic mode is enabled but should be done if possible
40     scheduler.shutdown