TTGO + DS18b20

davidmarli
Posts: 2
Joined: Sun Oct 17, 2021 4:31 pm

TTGO + DS18b20

Postby davidmarli » Thu Jan 20, 2022 4:14 pm

Hi,

sorry, I don't if this is the right place to post my question.

I used to work with esp8266.
I discovered esp32 with a TTGO v1.1
I manage to print things on the screen.

Now I would like to use a DS18b20 sensor, but I don't know where are the pins we can use with ttgo...

I try pin 2 25 or 12 but the sensor is never found.

If I replace the ttgo with an esp8266 it works great !!!

What I don't understand is how to name the pin numbers ???
D1, D2 or so seems to be not working.
I try 1 2 25, it doesn't work either...

I code with Visual Studio code (platformio)
I put this at the begining of my code :

Code: Select all

#define ONE_WIRE_BUS 2  

OneWire  ds(ONE_WIRE_BUS);  //  (a 4.7K resistor is necessary - 5.7K work with 3.3 ans 5V power)
DallasTemperature sensors(&ds);
DeviceAddress insideThermometer;
I put a 5.7K resistor between 3v and pin 2, but nothing works.

Thank you for your help.

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