├── README
└── Bluetooth Proximity Light.py


/README:
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1 | Requires python-bluez on ubuntu
2 | 


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/Bluetooth Proximity Light.py:
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  1 | import fcntl
  2 | import struct
  3 | import array
  4 | import bluetooth
  5 | import bluetooth._bluetooth as bt
  6 | import RPi.GPIO as GPIO
  7 | import time
  8 | import os
  9 | import datetime
 10 | 
 11 | def bluetooth_rssi(addr):
 12 |     # Open hci socket
 13 |     hci_sock = bt.hci_open_dev()
 14 |     hci_fd = hci_sock.fileno()
 15 | 
 16 |     # Connect to device (to whatever you like)
 17 |     bt_sock = bluetooth.BluetoothSocket(bluetooth.L2CAP)
 18 |     bt_sock.settimeout(10)
 19 |     result = bt_sock.connect_ex((addr, 1))	# PSM 1 - Service Discovery
 20 | 
 21 |     try:
 22 |         # Get ConnInfo
 23 |         reqstr = struct.pack("6sB17s", bt.str2ba(addr), bt.ACL_LINK, "\0" * 17)
 24 |         request = array.array("c", reqstr )
 25 |         handle = fcntl.ioctl(hci_fd, bt.HCIGETCONNINFO, request, 1)
 26 |         handle = struct.unpack("8xH14x", request.tostring())[0]
 27 | 
 28 |         # Get RSSI
 29 |         cmd_pkt=struct.pack('H', handle)
 30 |         rssi = bt.hci_send_req(hci_sock, bt.OGF_STATUS_PARAM,
 31 |                      bt.OCF_READ_RSSI, bt.EVT_CMD_COMPLETE, 4, cmd_pkt)
 32 |         rssi = struct.unpack('b', rssi[3])[0]
 33 | 
 34 |         # Close sockets
 35 |         bt_sock.close()
 36 |         hci_sock.close()
 37 | 
 38 |         return rssi
 39 | 
 40 |     except:
 41 |         return None
 42 | 
 43 | 
 44 | 
 45 | far = True
 46 | far_count = 0
 47 | 
 48 | # assume phone is initially far away
 49 | rssi = -255
 50 | rssi_prev1 = -255
 51 | rssi_prev2 = -255
 52 | 
 53 | near_cmd = 'br -n 1'
 54 | far_cmd = 'br -f 1'
 55 | 
 56 | dagar_addr = '34:FC:EF:0C:8F:CB'
 57 | emily_addr = '43:29:B1:55:00:00'
 58 | 
 59 | debug = 1
 60 | 
 61 | while True:
 62 |     # get rssi reading for address
 63 |     rssi = bluetooth_rssi(dagar_addr)
 64 | 
 65 |     if debug:
 66 |         print datetime.datetime.now(), rssi, rssi_prev1, rssi_prev2, far, far_count
 67 | 
 68 | 
 69 |     if rssi == rssi_prev1 == rssi_prev2 == None:
 70 |         print datetime.datetime.now(), "can't detect address"
 71 |         time.sleep(0)
 72 | 
 73 |     elif rssi == rssi_prev1 == rssi_prev2 == 0:
 74 |         # change state if nearby
 75 |         if far:
 76 |             far = False
 77 |             far_count = 0
 78 |             os.system(near_cmd)
 79 |             print datetime.datetime.now(), "changing to near"
 80 | 	    GPIO.setwarnings(False)
 81 | 	    GPIO.setmode(GPIO.BCM)
 82 | 	    GPIO.setup(17, GPIO.OUT)
 83 | 	    GPIO.output(17, GPIO.LOW)
 84 |             time.sleep(1)
 85 | 
 86 |     elif rssi < -2 and rssi_prev1 < -2 and rssi_prev2 < -2:
 87 |         # if were near and single has been consisitenly low
 88 | 
 89 |         # need 10 in a row to set to far
 90 |         far_count += 1
 91 |         if not far and far_count > 10:
 92 |             # switch state to far
 93 |             far = True
 94 |             far_count = 0
 95 |             os.system(far_cmd)
 96 |             print datetime.datetime.now(), "changing to far"
 97 | 	    GPIO.setmode(GPIO.BCM)
 98 | 	    GPIO.setup(17, GPIO.OUT)
 99 | 	    GPIO.output(17, GPIO.HIGH)
100 |             time.sleep(1)
101 | 
102 |     else:
103 |         far_count = 0
104 | 
105 | 
106 |     rssi = rssi_prev1
107 |     rssi_prev1  = rssi_prev2
108 | 


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