Data Sheet

38
--dht11.lua--
-- Measure temperature, humidity and post data to thingspeak.com
-- 2014 OK1CDJ
-- DHT11 code is from esp8266.com
---Sensor DHT11 is conntected to GPIO0
pin = 1
Humidity = 0
HumidityDec=0
Temperature = 0
TemperatureDec=0
Checksum = 0
ChecksumTest=0
function getTemp()
Humidity = 0
HumidityDec=0
Temperature = 0
TemperatureDec=0
Checksum = 0
ChecksumTest=0
--Data stream acquisition timing is critical. There's
--barely enough speed to work with to make this happen.
--Pre-allocate vars used in loop.
bitStream = {}
for j = 1, 40, 1 do
bitStream[j]=0
end
bitlength=0
gpio.mode(pin, gpio.OUTPUT)
gpio.write(pin, gpio.LOW)
tmr.delay(20000) --default 20000
--Use Markus Gritsch trick to speed up read/write on GPIO
gpio_read=gpio.read
gpio_write=gpio.write
gpio.mode(pin, gpio.INPUT)
--bus will always let up eventually, don't bother with timeout
while (gpio_read(pin)==0 ) do end
c=0
while (gpio_read(pin)==1 and c<100) do c=c+1 end
--bus will always let up eventually, don't bother with timeout
while (gpio_read(pin)==0 ) do end
c=0
while (gpio_read(pin)==1 and c<100) do c=c+1 end