How High is the SDA/SCL High of the ESP32?

[Woshicado]

Hardware:

Board: ESP32 Dev Module
Core Installation/update date: ?11/jul/2017?
IDE name: Arduino IDE
Flash Frequency: ?40Mhz?
Upload Speed: 115200

Description:

Hey, I want to use a i2c sensor that can't handle 5V SDA/SCL so I'd like to know how high the high of the esp32 is. Googling it didn't help, I looked for more than an hour now so I would appreciate every answer.

[stickbreaker]

@Skel0t The ESP32 is a 3.3v device all of it's I/O's are limited to 0 .. 3.3V

The I2C pullups must be connect to 3.3v.

Chuck.

[Woshicado]

So I don't need to use any resistors? From what I've read researching until now, I would need a 4.7k resistor between SDA & Vcc and SCL & Vcc for 5V and 2.4k instead of 4.7k for a 3.3V device.

[stickbreaker]

@Skel0t yes, you need to add Pullups, with 3.3v use between 2.4k and 3.3k to 3.3V.

Here is a captured thread how I justified these values Pullup Resistor Values.

Chuck.

[Woshicado]

Thank you gor your help!
Problem solved then