STM32 Discovery comminication with ESP WROOM-02 through USART

[Ufuk Varl?k]

Posted on September 19, 2017 at 10:24

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.

[Ufuk Varl?k]

Posted on September 19, 2017 at 10:32

The schematic is designed for the STM32L011D3, but the pull-up and pull-down connections are also valid for the STM32F051R8.