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Projects/Open_Wifi_Finder/wifi_finder.py

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+#!/usr/bin/env python
+''' 
+ wifi_finder.py
+ Scan for open wifi networks!  This is a portable wifi hotspot finder.  See our project at www.dexterindustries.com/GrovePi for more information on turning this into a portable wifi hotspot finder.
+
+ Software Setup Notes:
+ 	* This example uses https://wifi.readthedocs.org/en/latest/wifi_command.html.  Install with pip install wifi
+ 	* Wifi dongle must be on wlan0 ; Check this with the command "ifconfig" on the command line.
+ Hardware Setup Notes:
+ 	* Buzzer goes on port 8 of the GrovePi.
+ 	* LED Goes on port 4 of the GrovePi.
+ 	* The LCD goes on I2C-1.  Check this with the command "sudo i2cdetect -y 1"
+
+ The GrovePi connects the Raspberry Pi and Grove sensors.  You can learn more about GrovePi here:  http://www.dexterindustries.com/GrovePi
+
+ Have a question about this example?  Ask on the forums here:  http://forum.dexterindustries.com/c/grovepi
+'''
+'''
+## License
+
+The MIT License (MIT)
+
+GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
+Copyright (C) 2017  Dexter Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+'''
+
+
+from wifi import *
+import time
+import grovepi
+from grove_rgb_lcd import *
+
+## Connections
+# LCD Goes on I2C-1
+buzzer = 2		# Connect the Grove Buzzer to digital port D8
+led = 3			# Connect the Grove LED to digital port D3
+
+grovepi.pinMode(buzzer, "OUTPUT")
+grovepi.pinMode(led, "OUTPUT")
+
+def check_open_ssids():
+	open_ssids = []
+	for cell in Cell.all('wlan0'):
+		if cell.encrypted == False:
+			# print cell.ssid
+			open_ssids.append(cell.ssid)
+	return open_ssids
+
+def alert_user():
+	# Buzz for 0.1 seconds
+	grovepi.digitalWrite(buzzer,1)
+	grovepi.digitalWrite(led,1)		# Send HIGH to switch on LED
+	time.sleep(0.5)
+	# Don't buzz for 0.1 seconds
+	grovepi.digitalWrite(buzzer,0)
+	grovepi.digitalWrite(led,0)		# Send LOW to switch off LED
+	time.sleep(0.5)
+
+# Print the ssid name to the LCD, beep and turn the LED on and off.
+def display_ssid(ssid):
+	alert_user()
+	string_out = "SSID Available: " + str(ssid)
+	
+	try:
+		setText(string_out)
+		setRGB(0,128,64)
+
+		alert_user()
+
+		for c in range(0,255):
+			setRGB(c,255-c,0)
+			time.sleep(0.01)
+
+		time.sleep(3)
+		setRGB(0,0,0)
+	except:
+		print("Failed on something or other!")
+
+
+try:
+	while True:
+
+		list_of_open = []
+		
+		# 1). Test for any open ssids
+		list_of_open = check_open_ssids()
+		print(list_of_open)
+		
+		# 2). If we find open ssids turn light and buzzer on, print to SSID.
+		for ssid in list_of_open:
+			display_ssid(ssid)
+		
+		# 3). Look around ever 5 seconds.
+		time.sleep(5)
+except:
+	pass
+finally:
+	setText("")
+	setRGB(0,0,0)
+	grovepi.digitalWrite(buzzer,0)
+	grovepi.digitalWrite(led,0)
+