Hello, I want to use an i2c oled screen through the GPIO32 and GPIO33 ports of the esp32 and leave the GPIO21 and GPIO22 ports free for other i2c connections, but I can't get the screen to show an image, this is my code: #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #def…

[image] yhomer: free for other i2c connections Hello yhomer Why? You are using a I²C bus system to connect addtional I²C hardware already. Have a nice day and enjoy coding in C++.

I'm not using any hardware, only the esp32, I want the esp32 to have two independent i2c connections, one for the screen and the other for an i2c scanner, can you tell me why not use a single i2c bus? The answer is that if I connect the screen to the same scanner bus creates conflicts for me that's …

That´s very simple. Do it - check it !

Well, up to now I have not been able to get the screen to show an image working on the 2 buses, working on a single bus, it does not matter in which ports it manages to give an image

[image] yhomer: I'm not using any hardware, only the esp32 ESP32 is hardware. So is a screen. [image] yhomer: the other for an i2c scanner What do you mean by that? Please post a link to the spec of this scanner. Please explain why this scanner needs to be on a different bus to the sc…

Maybe this could be the problem: [image] yhomer: Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); ... TwoWire I2C_1 = TwoWire(0); TwoWire I2C_2 = TwoWire(1); With the screen, you are using the standard "Wire" object. But later you create 2 i2c objects, one of which m…

I2C Bus is a two-wire communication network that allows multiple devices to be connected in parallel; however, the condition is that 7-bit slaveAddress of a device must be different from that of other devices. Please, 1. Connect your OLED Display Unit alone with ESP32 Board and run the "Scanner Pr…

Thanks for your support guys, I already managed to make my project work, I exchanged the connection order, the oled screen to the main i2c of the esp32 ports 21 and 22 and the i2c scanner to ports 32 and 33 and it started to work, I don't understand why the screen oled does not connect with wire1 la…

[image] yhomer: I don't understand why the screen oled does not connect with wire1 layers its default library takes the main wire connection of esp32 but exchanging it worked You would have certainly got the answer if you would have exercised the tasks of post #9!

Help, multiple i2c buses esp32

Projects General Guidance

Koepel April 5, 2023, 6:06am 8

Using TwoWire in the sketch is no longer required.
See my post here: https://forum.arduino.cc/t/using-twowire-i2c2-with-esp32-two-pressure-sensors/1061318/10

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Help, multiple i2c buses esp32

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