diff --git a/lua_modules/ds18b20/ds18b20.lua b/lua_modules/ds18b20/ds18b20.lua
index 3857c941..bc1b1c99 100644
--- a/lua_modules/ds18b20/ds18b20.lua
+++ b/lua_modules/ds18b20/ds18b20.lua
@@ -35,27 +35,27 @@ setfenv(1,M)
 C = 0
 F = 1
 K = 2
-function setup(dq) 
-    pin = dq
-	if(pin == nil) then
-		pin = defaultPin		
-	end
-	ow.setup(pin)
+function setup(dq)
+  pin = dq
+  if(pin == nil) then
+    pin = defaultPin
+  end
+  ow.setup(pin)
 end
 
 function addrs()
-	setup(pin)
-	tbl = {}
-	ow.reset_search(pin)
-	repeat
-		addr = ow.search(pin)
-		if(addr ~= nil) then
-			table.insert(tbl, addr)	
-		end
-		tmr.wdclr()
-	until (addr == nil)
-	ow.reset_search(pin)
-	return tbl
+  setup(pin)
+  tbl = {}
+  ow.reset_search(pin)
+  repeat
+    addr = ow.search(pin)
+    if(addr ~= nil) then
+      table.insert(tbl, addr)
+    end
+    tmr.wdclr()
+  until (addr == nil)
+  ow.reset_search(pin)
+  return tbl
 end
 
 function readNumber(addr, unit)
@@ -64,71 +64,71 @@ function readNumber(addr, unit)
   flag = false
   if(addr == nil) then
     ow.reset_search(pin)
-	count = 0
+    count = 0
     repeat
-		count = count + 1
-		addr = ow.search(pin)
-		tmr.wdclr()
-	until((addr ~= nil) or (count > 100))
-	ow.reset_search(pin)
-  end	
+      count = count + 1
+      addr = ow.search(pin)
+      tmr.wdclr()
+    until((addr ~= nil) or (count > 100))
+    ow.reset_search(pin)
+  end
   if(addr == nil) then
-	return result
+    return result
   end
   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
-        -- print("Device is a DS18S20 family device.")
-        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)
-        -- print("P="..present)  
-        data = nil
-        data = string.char(ow.read(pin))
-        for i = 1, 8 do
-            data = data .. string.char(ow.read(pin))
+      -- print("Device is a DS18S20 family device.")
+      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)
+      -- print("P="..present)
+      data = nil
+      data = string.char(ow.read(pin))
+      for i = 1, 8 do
+        data = data .. string.char(ow.read(pin))
+      end
+      -- print(data:byte(1,9))
+      crc = ow.crc8(string.sub(data,1,8))
+      -- print("CRC="..crc)
+      if (crc == data:byte(9)) then
+        if(unit == nil or unit == C) then
+          t = (data:byte(1) + data:byte(2) * 256) * 625
+        elseif(unit == F) then
+          t = (data:byte(1) + data:byte(2) * 256) * 1125 + 320000
+        elseif(unit == K) then
+          t = (data:byte(1) + data:byte(2) * 256) * 625 + 2731500
+        else
+          return nil
         end
-        -- print(data:byte(1,9))
-        crc = ow.crc8(string.sub(data,1,8))
-        -- print("CRC="..crc)
-        if (crc == data:byte(9)) then
-			if(unit == nil or unit == C) then
-				t = (data:byte(1) + data:byte(2) * 256) * 625
-			elseif(unit == F) then
-				t = (data:byte(1) + data:byte(2) * 256) * 1125 + 320000 
-			elseif(unit == K) then
-				t = (data:byte(1) + data:byte(2) * 256) * 625 + 2731500
-			else
-				return nil
-			end            
-            t1 = t / 10000
-            t2 = t % 10000
-            -- print("Temperature="..t1.."."..t2.." Centigrade")
-			-- result = t1.."."..t2
-			return t1, t2
-        end                   
-        tmr.wdclr()
+        t1 = t / 10000
+        t2 = t % 10000
+        -- print("Temperature="..t1.."."..t2.." Centigrade")
+        -- result = t1.."."..t2
+        return t1, t2
+      end
+      tmr.wdclr()
     else
-     -- print("Device family is not recognized.")
+    -- print("Device family is not recognized.")
     end
   else
-   -- print("CRC is not valid!")
+  -- print("CRC is not valid!")
   end
   return result
 end
 
 function read(addr, unit)
-	t1, t2 = readNumber(addr, unit)
-	if((t1 == nil ) or (t2 ==nil)) then
-		return nil
-	else	
-		return t1.."."..t2
-	end
+  t1, t2 = readNumber(addr, unit)
+  if((t1 == nil ) or (t2 ==nil)) then
+    return nil
+  else
+    return t1.."."..t2
+  end
 end
 
 -- Return module table
-return M
\ No newline at end of file
+return M