History

Marcel Stör cb2808835d Fix Markdown syntax issues, fixes #2347		2018-04-06 17:35:23 +02:00
..
README.md	Fix Markdown syntax issues, fixes #2347	2018-04-06 17:35:23 +02:00
lm92.lua	remove deprecated init functions in adxl345, am2320, bme280, bmp085, hdc1080, hmc58831, l3g4200d, HDC1000, lm92 (#2276 )	2018-03-12 07:56:07 +01:00

README.md

LM92 module

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

06/01/2016: Add get/set comparison registers. Thyst, Tlow, Thigh and Tcrit
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

setup()

Description

Setting the address for lm92.

Syntax

setup(sda, scl, address)

Parameters

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
i2c.setup(0, sda, scl, i2c.SLOW)  -- call i2c.setup() only once
LM92.setup(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()

setThyst()

Description

Set hysteresis Temperature.

Syntax

setThyst(data_wr)

Parameters

data_wr: 130~-55 ºC, hysteresis Temperature

Returns

nil

Example

LM92.setThyst(3)

setTcrit()

Description

Set Critical Temperature.

Syntax

setTcrit(data_wr)

Parameters

data_wr: 130~-55 ºC, Critical Temperature

Returns

nil

Example

LM92.setTcrit(100.625)

setTlow()

Description

Set Low Window Temperature.

Syntax

setTlow(data_wr)

####Parameters data_wr: 130~-55 ºC, Low Window Temperature

Returns

nil

Example

LM92.setTlow(32.25)

setThigh()

####Description Set High Window Temperature.

Syntax

setThigh(data_wr)

Parameters

data_wr: 130~-55 ºC, High Window Temperature

Returns

nil

####Example

LM92.setThigh(27.5)

getThyst()

Description

Get hysteresis Temperature.

Syntax

getThyst()

Parameters

Returns

Hysteresis Temperature in degree Celsius.

Example

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

getTcrit()

Description

Get Critical Temperature.

Syntax

getTcrit()

Parameters

Returns

Critical Temperature in degree Celsius.

Example

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

getTlow()

Description

Get Low Window Temperature.

Syntax

getTlow()

Parameters

Returns

Low Window Temperature in degree Celsius.

Example

t = LM92.getTlow()
print("Got Low Window temperature: "..t.." C")

getThigh()

Description

Get High Window Temperature.

Syntax

getThigh()

Parameters

Returns

High Window Temperature in degree Celsius.

Example

t = LM92.getThigh()
print("Got High Window temperature: "..t.." C")

Full example

--node.compile("lm92.lua")
LM92 = require("lm92")
gpio0 = 3
gpio2 = 4
sda = gpio0
scl = gpio2
addr = 0x48
i2c.setup(0, sda, scl, i2c.SLOW)  -- call i2c.setup() only once
LM92.setup(addr)
 
t = LM92.getTemperature()
print("Got temperature: "..t.." C")

--Seting comparison temperatures
LM92.setThyst(3)
LM92.setTcrit(40.75)
LM92.setTlow(28.5)
LM92.setThigh(31.625)

t = LM92.getThyst()
print("Got hyster: "..t.." C")
t = LM92.getTcrit()
print("Got Crit: "..t.." C")
t = LM92.getTlow()
print("Got Low: "..t.." C")
t = LM92.getThigh()
print("Got High: "..t.." C")

TODO:

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