SDA

[hikmet1694]

Hello,
I'm using two bmp 581 sensors to get the pressure reading, on one arduino nano board, unfortunately I designed the pcb and didn't check the address issue with the sensors and connected sdo pin to vdd and now can't fix it, sensors have same address. Is there a way through software to assign sda and scl to another arduino pins?

 

[FvM]

It should be always possible to run software I2C on arbitrary Arduino GPIO pins. Don't know if there are ready made libraries supporting alternative I2C pins.

 

[betwixt]

Usually the command to start (or initialize) the I2C functions allows the pins to be specified if the default ones cannot be used.

Brian.

 

[KlausST]

Hi,

ARDUINO is an IDE. And whether the I2C pins may be moved depends on the used microcontroller ... unless (not recommended) bit-banging is used.

There is Arduino (compatible) hardware (modules) but their name is "ARDUINO UNO" for example.

I use ESP32 (with Arduino IDE) and here the microcontroller is able to MUX the interface pins to almost every pin you like.

Klaus

 

[FvM]

The OP refers to Arduino Nano.

 

[KlausST]

The OP refers to Arduino Nano.

Thanks. Didnt see this.

Ok, then it´s a ATMEGA328 .. with only one hardware I2C perifieral.
So the workaround could just be with bit banging.

Klaus

 

[D.A.(Tony)Stewart]

I doubt you will make this mistake again.

Also run everything at 3.3V or 3V if you can or if using a battery 3.0 to 3.6V with ultra low LDO.

https://www.digikey.ca/en/products/detail/stmicroelectronics/LD57100J330R/21348950?s=N4IgjCBcoKwOwGYqgMZQGYEMA2BnApgDQgD2UA2iAEwIIAMAHAGwjFVNwAsMVIAusQAOAFyggAysIBOASwB2AcxABfYmDhwAnMhBpIWPEVIVwXMGBj8hoyBOnylq6nSaXoujDgLEykSproESzU6TgY4VnAqTQtIsM0GGGCQMKYGKjorEBExSVlFFWIAWl53PWkAVyNfSks%2BZSdSygrsaUwAAmwSAHd2gBkAEQB5LJZ3GQATMSKwOghrMUjhAE9BfDFMXDQGoA

80 mV dropout at 1A 3.3V out or adjustable version