Chat here is you are connecting ESP-xx type modules to existing AVR based Arduino

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By Philippec66
#63140 Hello,
I use MPL3115A2 and other sensor on same I2C Bus.
Master is ESP8266, slave MPL3115, HTU21D and ATtiny85 use as pulse counter (my sketch).
Only When i connect MLP3115 the Attiny85 doesn't respond, look like I2C bus is hang up or buffer full, ATtiny and HUD21D are ok together.
MLP3115 alone is OK.
Is any parameter in MPL3115 librairy to change?

same with both librairy
#include <SparkFunMPL3115A2.h>
#include <Adafruit_MPL3115A2.h>
#include <MPL115A2.h> this one doesn't work, esp hang up at boot
Thanks for help