ESP8266 I2C with arduino nano

Hello,

I have a Heltec wifi kit 8 with a ESP8266 in it. I also hava an arduino nano. I want to use I2C for a communication between them. The ESP8266 would be the slave who writes and receives something from the arduino nano as master. The ESP8266 works with 3.3 V and the nano with 5 V. Do i need to use a voltage regulator or voltage devider or something else or can i just connect SDA en SCL to both boards?

Thanks!

I2C slave doesn't work on esp8266

So the esp8266 has to be the master?

even better, don't use I2C. I2C on esp8266 arduino is bitbanged (emulated by software)