Communication between esp8266 and arduino

Using Arduino Networking, Protocols, and Devices
#1

Hallo together,
I am working on a small weather station. The plan is to connect multiple sensors to an esp8266, some are using I2C as protocol.
The station shall work with a battery, thus I set the esp8266 to deep sleep to save power.
As I reset the esp8266 on each wakeup it should not be an issue with the i2c protocol.

In order to connect a rain gauge that requires an interrupt I will use an Arduino Nano to count the pulses from the reed switch.
This Arduino shall be in deep sleep.
To send the rain counter to the esp8266 I need a connection between esp8266 and arduino. One digital wire allows me to wakeup the arduino with a command that is sent by the esp8266.

Now comming to my question: Which protocol can be used to send the data from the arduino to the esp8266? I aready tried i2c but this is very complicated due to the sleep mode.
Is there a better way to deal with it?

Thanks to your support.
Greetings
Ben

#2

I solved the issue by using SPI as communication protocol between the ESP8266 and the Arduino.

#3

ESP8266 is an IC.
Depending on which ESP8266 module you have, it may not even necessary to have the Arduino.

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#4

Use software serial,and use uart protocol it is simle and faster then i2c

#5