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[AVR] Need help in intefacing atmega1281 with gsm and lcd

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Sharks12

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Hi,

I need some help in configuring the USART for atmega1281 with LCD and GSM SIM900 to just send some basic AT commands like a text message and see the result on LCD or pc screen.
I just cant figure out how to do it. I've connected the microcontroller to GSM via Port E as that is USART0, connecting RX (bit 0), TX(bit 1) and GND.
Atmega1281 is connected to PC via serial to USB comms written in C with Atmel Studio 7
GPRS Shield UART is 19200 bps 8-N-1.
Bought from
https://www.banggood.com/SIM900-Qua...rd-For-Arduino-p-964229.html?cur_warehouse=CN

How can I send commands via hyperterminal to allow this to work?
If you have a sample code for which I can work on and help me configure, I would really appreciate it.

Thank you :smile:
 

Are you aware that UART signals from uCs are within TTL limits whereas these GSM modules in general operates in RS232 electrical standard ? The above link do not provide much information about that.
 

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