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
ESP32 GeekWom board I2c not square and wrong freq: Picture
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- Posts: 26
- Joined: Wed Jun 28, 2017 5:03 pm
Re: ESP32 GeekWom board I2c not square and wrong freq: Picture
Hi,
You need pullups 2k2 to 10k on both I2C lines. internal pullups are to weak.
Dont know what causes the frequency deviation.
Dig
You need pullups 2k2 to 10k on both I2C lines. internal pullups are to weak.
Dont know what causes the frequency deviation.
Dig
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