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ruanhaishen
Nodemcu Firmware
Commits
a3e51872
Commit
a3e51872
authored
Feb 02, 2015
by
Javier Yáñez
Browse files
Support for versions of NodeMCU with float point
Read error is indicated with humidity = nil
parent
055c55a7
Changes
1
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Side-by-side
lua_modules/dht22/dht22.lua
View file @
a3e51872
...
...
@@ -77,15 +77,17 @@ function M.read(pin)
end
end
checksumTest
=
((
humidity
/
256
)
+
(
humidity
%
256
)
+
(
temperature
/
256
)
+
(
temperature
%
256
))
%
256
checksumTest
=
(
bit
.
band
(
humidity
,
0xFF
)
+
bit
.
rshift
(
humidity
,
8
)
+
bit
.
band
(
temperature
,
0xFF
)
+
bit
.
rshift
(
temperature
,
8
))
checksumTest
=
bit
.
band
(
checksumTest
,
0xFF
)
if
temperature
>
0x8000
then
-- convert to negative format
temperature
=
-
(
temperature
-
0x8000
)
end
if
checksum
~=
checksumTest
then
humidity
=
-
1
-- conditions compatible con float point and integer
if
(
checksumTest
-
checksum
>=
1
)
or
(
checksum
-
checksumTest
>=
1
)
then
humidity
=
nil
end
end
...
...
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