ESP32 GeekWom board I2c not square and wrong freq: Picture

[Olfox59]

Hi every body,

I'm developping an app with i2c device, and i am really surprised to see my signal really not square, it is like there is a capacitor effect on the ligne.

I also don't understand why signal frequency equal around 73khz, while i set 100khz.

I am connecting on pin 19 for scl and pin18 for sda, internal pull enabled.

I have the same waveform without conneting device and disable ACK.

Look at this picture :






Thanks for your help

[Dig Kleppe]

Hi,
You need pullups 2k2 to 10k on both I2C lines. internal pullups are to weak.
Dont know what causes the frequency deviation.
Dig