nodemcu-firmware/lua_modules/lm92

LM92 module

This module adds basic support for the LM92 +-0.33C 12bit+sign temperature sensor. More details in the datasheet. Works:

• getting the temperature
• entering the chip's to shutdown mode (350uA -> 5uA power consumption)
• waking up the chip from shutdown

##Require

LM92 = require("lm92")

Release

LM92 = nil
package.loaded["lm92"]=nil

##init() ####Description Setting the i2c pins and address for lm92.

####Syntax init(sda, scl, address)

####Parameters sda: 1~12, IO index.
scl: 1~12, IO index.
address: 0x48~0x4b, i2c address (depends on tha A0~A1 pins) ####Returns nil

####Example

LM92 = require("lm92")
gpio0 = 3
gpio2 = 4
sda = gpio0
scl = gpio2
addr = 0x48
LM92.init(sda, scl,addr)

##getTemperature() ####Description Returns the temperature register's content.

####Syntax getTemperature()

####Parameters

####Returns Temperature in degree Celsius.

####Example

t = LM92.getTemperature()
print("Got temperature: "..t.." C")

##wakeup() ####Description Makes the chip exit the low power shutdown mode.

####Syntax wakeup()

####Parameters

####Returns

####Example

LM92.wakeup()
tmr.delay( 1 * 1000 * 1000 )

##shutdown() ####Description Makes the chip enter the low power shutdown mode.

####Syntax shutdown()

####Parameters

####Returns

####Example

LM92.shutdown()

TODO:

• add full support of the features, including interrupt and critical alert support