Hi Shashank,You need a RS232 | Microcontroller › AVR › gsm based water pump controller using atmega16 › Hi Shashank,You need a RS232 May 25, 2013 at 4:19 am #9823 AJISH ALFREDParticipant Hi Shashank, You need a RS232 to TTL convereter cable. Connect the TX pin at the TTL end of the cable to RX of MCU and RX of MCU to TX pin of the TTL end of the cable. No need of other pins.
