ADS1115 interfacing with AVR MCU
based on ADS1115 Analog Digital Converter AVR Library - https://github.com/tonysteinbock/avr-ads1115
Uses my custom I2C library
* ADS1115 SCL --- I2C_SCL = PINB2* ADS1115 SDA --- I2C_SDA = PINB3
* ADS1115 ADDR --- GND
* ADS1115 ALERT/DDRY --- any I/O = PIND3