ESP8266 Community Forum

Hello,

I'm currently trying to get a DS18B20 module to work with the ESP8266.

I'm using the lib: https://github.com/nodemcu/nodemcu-firm ... 8b20.EN.md
with the following code:



This returns:


As you can see, it is reading a temperature of 2,5625°C, which is ofcourse wrong.
I tested the hardware setup by connecting the datapin to an arduino and got the correct readout of about 21°C.

My DS18B20 is a geniune one, not a chinese clone. Any ideas what could be wrong here?

Thanks,
Tobias

Hm, got it to work.

As it turns out, my sensors are DS18S20, which are similar but not identical. They have a slightly different way of storing the data.

I added this into the routine to get the sensors to work.

manawyrm wrote:Hm, got it to work.

As it turns out, my sensors are DS18S20, which are similar but not identical. They have a slightly different way of storing the data.

I added this into the routine to get the sensors to work.

Code: Select allt = t * 8
 if (data:byte(8) == 0x10) then
    t = BitAND(t, 0xFFF0) + 12 - data:byte(7)
end

Could you show the complete script you're using? I'm also trying to use a DS18S20 but can't get the readings right. Thanks!