4.0 KiB
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