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STM32 Discovery comminication with ESP WROOM-02 through USART

Question asked by Ufuk Varlık on Sep 19, 2017
Latest reply on Sep 19, 2017 by Ufuk Varlık

Dear forum members,

I will communicate using USART STM32F051R8 with ESP WROOM-02. 

I sending "AT\r\n", but the response is not "OK". The oscilloscope shows rx & tx 3 volts square wave. What would be the reason ?

Thanks for comments.SCREEN SHOOT