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Merge pull request #166 from javieryanez/patch-3 

Support for versions of NodeMCU with float point
This commit is contained in:
Vowstar 2015-02-03 12:52:26 +08:00
parent cd49b76763 a3e518724c
commit ce96564bb0
1 changed files with 5 additions and 3 deletions
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8
lua_modules/dht22/dht22.lua
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@ -77,15 +77,17 @@ function M.read(pin)
end end
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 if temperature > 0x8000 then
-- convert to negative format -- convert to negative format
temperature = -(temperature - 0x8000) temperature = -(temperature - 0x8000)
end end
if checksum ~= checksumTest then -- conditions compatible con float point and integer
humidity = -1 if (checksumTest - checksum >= 1) or (checksum - checksumTest >= 1) then
humidity = nil
end end
end end