Initial commit

.gitignore

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+credentials.lua

README.md

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+# esp8266-temperature
+
+This is my first stab at a wireless termometer.
+
+It expects a credentials.lua file with content like this:
+
+    SSID = "myssid"
+    PASSWORD = "mypasswd"

application.lua

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+pin = 4
+ow.setup(pin)
+
+counter=0
+lasttemp=-999
+
+dofile("dallas.lua")
+dofile("server.lua")

dallas.lua

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+function bxor(a,b)
+   local r = 0
+   for i = 0, 31 do
+      if ( a % 2 + b % 2 == 1 ) then
+         r = r + 2^i
+      end
+      a = a / 2
+      b = b / 2
+   end
+   return r
+end
+
+function getTemp()
+      addr = ow.reset_search(pin)
+      repeat
+        tmr.wdclr()
+      
+      if (addr ~= nil) then
+        crc = ow.crc8(string.sub(addr,1,7))
+        if (crc == addr:byte(8)) then
+          if ((addr:byte(1) == 0x10) or (addr:byte(1) == 0x28)) then
+                ow.reset(pin)
+                ow.select(pin, addr)
+                ow.write(pin, 0x44, 1)
+                tmr.delay(1000000)
+                present = ow.reset(pin)
+                ow.select(pin, addr)
+                ow.write(pin,0xBE, 1)
+                data = nil
+                data = string.char(ow.read(pin))
+                for i = 1, 8 do
+                  data = data .. string.char(ow.read(pin))
+                end
+                crc = ow.crc8(string.sub(data,1,8))
+                if (crc == data:byte(9)) then
+                   t = (data:byte(1) + data:byte(2) * 256)
+         if (t > 32768) then
+                    t = (bxor(t, 0xffff)) + 1
+                    t = (-1) * t
+                   end
+         t = t * 625
+                   lasttemp = t
+         print("Last temp: " .. lasttemp)
+                end                   
+                tmr.wdclr()
+          end
+        end
+      end
+      addr = ow.search(pin)
+      until(addr == nil)
+end

init.lua

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+-- load credentials, 'SSID' and 'PASSWORD' declared and initialize in there
+dofile("credentials.lua")
+
+function startup()
+    if file.open("init.lua") == nil then
+        print("init.lua deleted or renamed")
+    else
+        print("Running")
+        file.close("init.lua")
+        -- the actual application is stored in 'application.lua'
+        dofile("application.lua")
+    end
+end
+
+print("Connecting to WiFi access point...")
+wifi.setmode(wifi.STATION)
+wifi.sta.config(SSID, PASSWORD)
+-- wifi.sta.connect() not necessary because config() uses auto-connect=true by default
+tmr.alarm(1, 1000, 1, function()
+    if wifi.sta.getip() == nil then
+        print("Waiting for IP address...")
+    else
+        tmr.stop(1)
+        print("WiFi connection established, IP address: " .. wifi.sta.getip())
+        print("You have 3 seconds to abort")
+        print("Waiting...")
+        tmr.alarm(0, 3000, 0, startup)
+    end
+end)

server.lua

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+mycounter=0
+srv=net.createServer(net.TCP) 
+srv:listen(80, function(conn) 
+    conn:on("receive", function(conn, payload) 
+        if string.find(payload,"?myarg=") then
+            mycounter=mycounter+1
+            m="<br>Value= " .. string.sub(payload, string.find(payload,"?myarg=")+7,string.find(payload,"HTTP")-2)
+        else 
+            m=""
+        end
+
+        getTemp()
+
+        conn:send("<h1> Hello, this is Jeenas ESP8266.</h1><p>How are you today.<br> Count=" .. mycounter .. m .. "<br>Heap=" .. node.heap() .. "<br>Temp=" .. lasttemp)
+    end) 
+    conn:on("sent", function(conn) conn:close() end) 
+end)