I was trying to interface sim900a gsm module with atmega16a although the uc gives a proper usart ouput AT but the sim900a dosent responds to its commands. But when AT command is given using pc terminal it would respond just fine. Where am I going wrong Is it due to voltage difference?Please help.... I have attached ss of the terminal.
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Joined: Wed. Jan 17, 2018
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Last Edited: Sat. Jun 9, 2018 - 07:49 PM