atmega 32 has only one (TX/RX) .In case of connecting many devices working with UART what should I do?....Arduino has something called software serial Is it available in atmega 32 or how to establish it?
How to connect multiple devices on avr(atmega16/32) using UART?
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One may also use a multiplexer if the peripheral devices do not need to operate at the same time. This is a bit trickier to use due to baud rate changes and such but I have used this approach in one of my projects where I had a serial printer and some other devices which interfaced with the MCU via UART. The drivers for the said devices included calls to switch to the correct output on the multiplexer before communicating with the device.