Accessing SDA with an Automation Hat

Support
1

I am trying to use a RTC Backup for my Raspberry Pi 4 with an Automation Hat (PIM213), and to do so I need to be able to access a 3V3, GND, SCL and SDA pin. 3V3, GND, and SCL are accessible from the center of the hat, but from what I read in other forum threads the SDA pin is hooked up to the ADC section of the hat.

I was wondering if it would be possible to access that pin, either by configuring the hat to let the signal through, or maybe even accessing the pin directly underneath the hat, while the hat is plugged into the pi. Would either of these work? Is there anything I can do, or do I need to think about changing what hardware I am using?

2

The automation hat uses I2C to drive the ADC. But I2C is shared, you can hook up many devices on a single I2C bus as long as the addresses aren’t the same. So just run sudo i2cdetect -y 1 and the check the used address from the ADC. As long as your RTC doesn’t use this address, you are fine (and only have to solve the wiring issue).