AVR has USART and GSM works | Microcontroller › AVR › How To interface GSM modem with ATMEGA16 › AVR has USART and GSM works February 15, 2018 at 6:11 pm #14738 Ashutosh BhattParticipant AVR has USART and GSM works on serial protocol. so thats it. GSM works on simple AT commands that you can send from AVR micro controller and get things done
