DS3231 and pressure sensor problem

Projects General Guidance
4

And the time is being printed as 2165/165/165 165:165:165

This is a classic symptom of the rtc not being seen on the ic bus. Does either module, or both, have pullups on the sda/scl lines?

Can you run the i2c scanner program on the assembled package and see if the addresses are recognized when all the components are assembled together?

If you run the current code on the complete system with either the RTC or the pressure sensor commented out, does either one work alone?

// I2C Scanner
// Written by Nick Gammon
// Date: 20th April 2011

#include <Wire.h>

void setup() {
 Serial.begin (115200);

 // Leonardo: wait for serial port to connect
 while (!Serial) 
   {
   }

 Serial.println ();
 Serial.println ("I2C scanner. Scanning ...");
 byte count = 0;
 
 Wire.begin();
 for (byte i = 8; i < 120; i++)
 {
   Wire.beginTransmission (i);
   if (Wire.endTransmission () == 0)
     {
     Serial.print ("Found address: ");
     Serial.print (i, DEC);
     Serial.print (" (0x");
     Serial.print (i, HEX);
     Serial.println (")");
     count++;
     delay (1);  // maybe unneeded?
     } // end of good response
 } // end of for loop
 Serial.println ("Done.");
 Serial.print ("Found ");
 Serial.print (count, DEC);
 Serial.println (" device(s).");
}  // end of setup

void loop() {}