Microcontroller › AVR › How to connect 2 devices to single USART? › Hi Krishna,The TX of MCU to
November 26, 2013 at 10:05 am #10657
The TX of MCU to RX of SIM300 and RX of MCU to TX of GPS.
If you want to add accelerometer, then you have to switch between the TX of GPS and accelerometer using an analog switch like CD4066