Which pins should used or I2C?

[ismailagir]

Which pins should be used for I2C , is there any pre-defined ?

[mrudick1]

It depends. You can use the onboard JST connector as a Stemma/Qwiic connection. If you choose to do so, the pins are:

GND = GND
3V = 3V
GPIO 44 = SCL
GPIO 43 = SDA

If you don't use this connector and solder it yourself, you can use any of the available GPIO pins for SCL and SDA.

[jims1234]

Is there a 10K or equivalent pull up resistor mounted on the board on the SCL and SDA pins? if not do I need to add them externally?

[lewisxhe]

It is not necessary to use a sensor module, which is generally integrated on the module. If a separate sensor is used, it is necessary

[icubex]

It seems that on https://github.com/Xinyuan-LilyGO/T-QT/blob/main/image/pinmap_en.jpg the texts "IO44" and "IO43" as well as the corresponding numbers "44" and "43" on the PCB near the JST plug should be exchanged.

[ubidefeo]

@icubex
I found out the same thing by just trying.

@icubex @mrudick1 I have opened #37 to address this

u.