ESP8266 Community Forum

Posted: **Tue Jul 11, 2017 6:08 pm**

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Posted: **Tue Jul 11, 2017 6:09 pm**

RFZ wrote:UART would be okay, but I prefer to not use it, because I program via UART and my design will have a USB 2 UART chip on it.

The ESP8266 has two UARTs: the second UART is actually designed for debugging and is on GPIO13 (RX) and GPIO15 (TX). :idea:

Posted: **Wed Jul 12, 2017 9:05 am**

UART1 is TX Only, there is no RX !
(except if you swap uarts, but then you still have only one with RX)

Posted: **Thu Jul 13, 2017 6:17 pm**

martinayotte wrote:there is no RX !

That's good to know, I didn't realize that upto now.
Nevertheless, he only needs an output, so that shouldn't be a problem.

Multiplexing a LED matrix using ESP8266 hardware