ADS1015 pullups - RaspiPi

[wildpalms]

I'm currently playing with a single ADS1015 board on a Rasberry Pi using the AdaFruit library. I now need to expand the project to use 3 boards and was looking into the pullups. Each board has 10k pullups and the RasPi apparently has its own 1.8k pullups. The result of this is that the total will be 1.16k rather than the current 1.5k. Is this going to be OK?

The second and major part of my question is pullup voltages. The pullups on the board are to the input vdd. I would like to run my board at 5v because it will be much easier to measure my inputs which are currently 0-5v but I'm worried about pulling the RasPi I2C lines up to 5v. I saw a tutorial on the Cambridge Uni site that seemed to omply it would be OK?

[adafruit_support_rick]

The pullups are OK for running 3 boards.

If you want to run them 5V, then connect them through one of these:
https://www.adafruit.com/product/757

If you connect 5V logic directly, you could damage your Pi.

[wildpalms]

Thanks for the reply. Looks like I will have to do something.

Rather than have the ADS1015 breakout pull the SDA & SCL lines up to 5v and then have a level shifter reduce them to 3.3v I think I will just remove the pullups fitted to the breakouts. Simpler design and cheaper :-) especially as the Pi already pulling it up already.

[adafruit_support_rick]

That should also work.