ESP8266 Community Forum

- Tue Nov 18, 2014 12:31 pm #2862

Trying to read a DHT11 I started to play with timer with a file like this:

gpio.write(8, gpio.HIGH)
tmr.delay(40)
gpio.write(8, gpio.LOW)

And with a scope I espected to see a high pulse os 40us but what I get is 180us

Haven't tried gpio.write yet, did you set the gpio pin to output with gpio.mode?

- Tue Nov 18, 2014 12:33 pm #2863 And with a function like this:

function p()
gpio.write(8, gpio.HIGH)
gpio.write(8, gpio.LOW)
end

I get a pulse of 90us

- Tue Nov 18, 2014 12:59 pm #2866 seems lua gpio module is not suit for 1-wire.
maybe a basic 1-wire read write api is needed, and do id search in lua.
I will add this to todo list

- Tue Nov 18, 2014 2:14 pm #2871 Great!! Good to know