Using 2nd I2C bus on STM32 Blackpill and Adafruit Library

Using Arduino Programming Questions
1

Hi,

I'm recently on a project that uses stm32 (F411 BlackPill), and an oled display 128x64 I²c (SH1106) to read a voltage using the ADC1115.

i would like to change the ads1115 i2c bus, to avoid conflicts with the display, i use the adafruit library, how do i do this? (Stm32f411 has 3 i2c buses)

do i need to modify the "wire" inside the adafruit library?

sorry for bad english

2

No, in the begin() call of the ADS1X15 library you can provide the Wire object to be used.

3

WeAct BlackPill at Adafruit: https://www.adafruit.com/product/4877
It is a 100 MHz STM32F411 Arm Cortex-M4

Can you explain what the conflict would be ?
Do you get noise from the I2C for the OLED ? Is there a bug that causes a software conflict ?

When reading a voltage, then you can take a few samples and calculate the average.

4

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