You were correct. The PI can read via i2c from the 5V sensor and also the 3V RTC but not concurrently. I used a logic level convertor and now both read correctly
Thanks for the advice on the logic convertor - In retrospect I should have chosen the 3V version of the pressure sensor. I've ordered a convertor and will post back if it is successful
Good point about the pullups. Both the DVLR pressure sensor (DLVR-L01D-E2NS-C-NI5F ) and the Adafruit DS3231 are fed from the 5V supply on the PI, ADAfruit state that the RTC can run at either 3.3 or 5V. (https://shop.pimoroni.com/products/adafruit-ds3231-precision-rtc-breakout?variant=16610898055&g...
Hi Folks - any thoughts on this probelm. I am using a PI3B to read and plot data from an DVLR i2c pressure sensor as part of an Infrasound project (http://www.starfishprime.co.uk/projects/infrasound/infrasound.html). No problems reading from the 5V i2c sensor. I now add an Adafruit DS3231 RTC fed fr...