├── init.lua
├── README.md
└── hcsr04.lua


/init.lua:
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 1 | -- My crappy open garage door notifier.
 2 | -- init.lua sets up the wifi connection then runs the notify() function every 60 seconds.
 3 | 
 4 | print("Setting up WIFI...")
 5 | wifi.setmode(wifi.STATION)
 6 | --modify according your wireless router settings
 7 | wifi.sta.config("SSID","PASSWORD")
 8 | wifi.sta.connect()
 9 | tmr.alarm(1, 1000, 1, function() 
10 | if wifi.sta.getip()== nil then 
11 | print("IP unavaiable, Waiting...") 
12 | else 
13 | tmr.stop(1)
14 | print("Config done, IP is "..wifi.sta.getip())
15 | dofile("hcsr04.lua")
16 | device = hcsr04.init()
17 | tmr.alarm(0, 60000, 1, function() notify() end)
18 | end 
19 | end)
20 | 
21 | 
22 | 


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/README.md:
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 1 | # ESP8266 + HC-SR04 + MB102 = Open Garage Door Notifier
 2 | 
 3 | My crappy cobbling together of code for my ESP8266 module which uses a HC-SR04 ultrasonic sensor. This is a dirty hack together of code. Use as you wish. Don't cry if you think the code is shitty. 
 4 | 
 5 | Picture of my Open Garage Door Notifier - http://i.imgur.com/XUx8l6T.jpg
 6 | 
 7 | Note that the HC-SR04 is being driven by the 5v rail and the ESP8266 is of course on 3.3v. The ECHO pin on the HC-SR04 has a 1K resistor in line to prevent the HC-SR04 from hurting the ESP8266. The HC-SR04 has no problem receiving a 3.3v signal on the TRIG pin, from the ESP8266.
 8 | 
 9 | My ESP-01 pins are assigned to:
10 | 
11 | 
12 | - GPIO0 and GPIO2 are used for ECHO and TRIG on the HC-SR04.
13 | - CH_PD is connected to Vcc (3.3v).
14 | - GND is ground, duh.
15 | - VCC is 3.3v.
16 | - RST is not connected.
17 | - UTXD and URXD connected to RX and TX of your USB UART (e.g. FTDI232L) for testing only.
18 | 
19 | 
20 | 
21 | Change the SSID and PASSWORD to the real values in init.lua.
22 | 
23 | Change the GPIO pin assignments and YOUR_API_KEY for Notify My Android in hcsr04.lua.
24 | 
25 | See my youtube video of an "Open Garage Door" notifier: https://www.youtube.com/watch?v=3zI72pZsJ4M
26 | 
27 | 
28 | 


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/hcsr04.lua:
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 1 | 
 2 | n=0
 3 | 
 4 | hcsr04 = {};
 5 | 
 6 | function hcsr04.init(pin_trig, pin_echo)
 7 | 	local self = {}
 8 | 	self.time_start = 0
 9 | 	self.time_end = 0
10 | -- Choose the correct GPIO pins for the trigger and echo of the HC-SR04 module
11 | 	self.trig = pin_trig or 3
12 | 	self.echo = pin_echo or 4
13 | 	gpio.mode(self.trig, gpio.OUTPUT)
14 | 	gpio.mode(self.echo, gpio.INT)
15 | 
16 | 	function self.echo_cb(level)
17 | 		if level == 1 then
18 | 			self.time_start = tmr.now()
19 | 			gpio.trig(self.echo, "down")
20 | 		else
21 | 			self.time_end = tmr.now()
22 | 		end
23 | 	end
24 | 
25 | 	function self.measure()
26 | 		gpio.trig(self.echo, "up", self.echo_cb)
27 | 		gpio.write(self.trig, gpio.HIGH)
28 | 		tmr.delay(100)
29 | 		gpio.write(self.trig, gpio.LOW)
30 | 		tmr.delay(100000)
31 | 		if (self.time_end - self.time_start) < 0 then
32 | 			return -1
33 | 		end
34 | 		return (self.time_end - self.time_start) / 58
35 | 	end
36 | 	return self
37 | end
38 | 
39 | -- Check to see if the ultrasonic sensor measures less than 50cm. If there are two measurements in a row less than 50cm then send a notification.
40 | -- This prevents false positives, as insects may set off the sensor every now and then.
41 | function notify()
42 |     if device.measure() < 50 then
43 |         print("Door is Open")
44 |         if n = 1 then
45 |             conn=net.createConnection(net.TCP, 0)  
46 |             conn:on("receive", function(conn, payload) print(payload)  end) 
47 |             conn:connect(80,"50.116.34.97")  
48 |             conn:send("GET /publicapi/notify?apikey=YOUR_API_KEY&application=ESP8266&event=G_DOOR_OPEN&description=Garage%20door%is%20open&priority=2\r\n HTTP/1.1\r\n") 
49 |             conn:send("Host: notifymyandroid.com\r\n")  
50 |             conn:send("Accept: */*\r\n") 
51 |             conn:send("User-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n") 
52 |             conn:send("\r\n")
53 |             n = 0
54 |         else n = 1
55 |         end	
56 |     else print("Door is closed")
57 |     end
58 | end
59 | 


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