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Adjust the detail, fix program bug

This commit is contained in:
Martin Han 2015-04-05 18:21:08 +08:00
parent 10ccfc6ad2
commit d625198209
1 changed files with 12 additions and 13 deletions
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25
lua_modules/dht22/README.md
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@ -1,6 +1,8 @@
# DHTxx module # DHTxx module
This module is compatible with DHT11, DHT21 and DHT22. This module is compatible with DHT11, DHT21 and DHT22.
And is able to auto-select wheather you are using DHT11 or DHT2x
No need to use a resistor to connect the pin data of DHT22 to ESP8266. No need to use a resistor to connect the pin data of DHT22 to ESP8266.
##Integer Verison[When using DHT11, Float version is useless...] ##Integer Verison[When using DHT11, Float version is useless...]
@ -10,14 +12,13 @@ PIN = 4 -- data pin, GPIO2
DHT= require("dht_lib") DHT= require("dht_lib")
--dht.read11(PIN) DHT.read(PIN)
DHT.read22(PIN)
t = DHT.getTemperature() t = DHT.getTemperature()
h = DHT.getHumidity() h = DHT.getHumidity()
if h == nil then if h == nil then
print("Error reading from DHT11/22") print("Error reading from DHTxx")
else else
-- temperature in degrees Celsius and Farenheit -- temperature in degrees Celsius and Farenheit
@ -41,8 +42,7 @@ PIN = 4 -- data pin, GPIO2
DHT= require("dht_lib") DHT= require("dht_lib")
--dht.read11(PIN) DHT.read(PIN)
DHT.read22(PIN)
t = DHT.getTemperature() t = DHT.getTemperature()
h = DHT.getHumidity() h = DHT.getHumidity()
@ -52,11 +52,12 @@ if h == nil then
else else
-- temperature in degrees Celsius and Farenheit -- temperature in degrees Celsius and Farenheit
-- floating point and integer version: -- floating point and integer version:
print("Temperature: "..t.." deg C")
print("Temperature: "..(t/10).." deg C")
print("Temperature: "..(9 * t / 50 + 32).." deg F") print("Temperature: "..(9 * t / 50 + 32).." deg F")
-- humidity -- humidity
print("Humidity: "..h.."%") print("Humidity: "..(h/10).."%")
end end
-- release module -- release module
@ -64,12 +65,10 @@ DHT = nil
package.loaded["dht_lib"]=nil package.loaded["dht_lib"]=nil
``` ```
## Functions ## Functions
### read11
read11(pin) ###read
Read humidity and temperature from DHT11. read(pin)
###read22 Read humidity and temperature from DHTxx(11,21,22...).
read22(pin)
Read humidity and temperature from DHT22/21.
**Parameters:** **Parameters:**
* pin - ESP8266 pin connect to data pin * pin - ESP8266 pin connect to data pin