nodemcu-firmware/lua_modules/si7021/si7021.EN.md

si7021 module

##Require

si7021 = require("si7021")

Release

si7021 = nil
package.loaded["si7021"]=nil

##init() ####Description Setting the i2c pin of si7021.

####Syntax init(sda, scl)

####Parameters sda: 1~12, IO index.
scl: 1~12, IO index.

####Returns nil

####Example

si7021 = require("si7021")
gpio5 = 1
gpio4 = 2
sda = gpio5
scl = gpio4
si7021.init(sda, scl)
-- Don't forget to release it after use
si7021 = nil
package.loaded["si7021"]=nil

####See also -

##read() ####Description Read temperature and humidity from si7021.

####Syntax read()

####Parameters nil.

####Returns nil(Why?).

####Example

si7021 = require("si7021")
sda = 1
scl = 2
si7021.init(sda, scl)
r = si7021.read()
print(r)
-- Don't forget to release it after use
si7021 = nil
package.loaded["si7021"]=nil

####See also -

##getHumidity() ####Description Get humidity from si7021.

####Syntax getHumidity()

####Parameters nil.

####Returns h: Integer, humidity from si7021.

####Example

si7021 = require("si7021")
sda = 1
scl = 2
si7021.init(sda, scl)
h = si7021.getHumidity()
print(h)
-- Don't forget to release it after use
si7021 = nil
package.loaded["si7021"]=nil

####See also -

##getTemperature() ####Description Get temperature from si7021.

####Syntax getTemperature()

####Parameters nil.

####Returns t: Integer, temperature from si7021.

####Example

si7021 = require("si7021")
sda = 1
scl = 2
si7021.init(sda, scl)
t = si7021.getTemperature()
print(t)
-- Don't forget to release it after use
si7021 = nil
package.loaded["si7021"]=nil

####See also -