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

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

Posted: Sun Jun 28, 2026 2:00 pm

by 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?