UNO-ESP8266-COM

This repository contains all the files required for establishing and communicating data transfer between Arduino UNO and ESP8266.

Overall Working

I2C_Device_Scanner:

• scans the device address of the slave device by writing to the addresses from 1 to 127
• Gets the address of the device if the slave device is able to write to it

Master Working:

Sends a passphrase "Hello" to the slave and requests the device name.

Slave Working:

On verifying the passphrase checks for request from the master and replies with the device name.

Master Code:

• In this project, ESP8266 acts as a master device for I2C communication.
• The pins used for I2C communication are SDA pin 4 and SCL pin 5
• Master sends String "Hello" to the slave device and requests the acknowledgment from the slave device
• Master requests the Device Name from the slave device

Slave Code:

Arduino is used as Slave device

Function receiveEvent():

• This function is executed whenever there is data sent from the master device
• Checks for the data on the I2C wire, if there is any data on the wire, slave stores it in the variable recvinfo
• When slave gets the string "Hello" from the Master device, it executes a function requestEvent()

Function requestEvent():

• Upon receiving string "Hello", slave writes string "UNO" to the Master Device