Hi Krishna,In your project it | Microcontroller › AVR › How to connect 2 devices to single USART? › Hi Krishna,In your project it October 15, 2013 at 4:50 am #10525 AJISH ALFREDParticipant Hi Krishna, In your project it is not such a big deal. The SIM300 always receives data and the GPS always transmits data only. So connect the SIM300 to the TX pin of the serial port and the GSM module to the RX pin of the serial port.
