I2C address conflict, 4 sensors same bus, how to fix?

[mark_ee_qc]

Thesis sensor stack: BME280, OLED, MPU6050, RTC. Two devices claim 0x68 (MPU6050 + DS3231 RTC). Bus locks up.

Tried:

• AD0 pin to GND on MPU (changes to 0x69)

Works. Pero hindi ko alam what to do if both devices have fixed address. Options:

• TCA9548A multiplexer (8 channels), PHP 200
• Two separate I2C buses on ESP32 (Wire + Wire1)
• Software I2C library

Mux fee for 4 sensors feels overkill. Sino dito gumamit ng TCA9548A in production?