Hello I am looking through the wiring diagrams of ESP8266 to Arduino Uno and ESP8266 to USB-UART converter. And I see that sometimes TX is connected to RX and sometimes also to TX . The same applies to the RX . I mainly see this when connecting ESP to Arduino. What is the relationship ie when TX...

Tx - transmitter Rx - receiver Always Tx with Rx, never otherwise. Unfortunately, in such a free flow of information, mistakes are often made that nobody verifies. Even some Chinese devices have the pins inverted (described, for example, here connect Rx and here connect Tx instead of this is Rx and this is TX). However, as a rule of thumb - one transmits and the other receives from here T ransmitter x to R eceiver x .

The bottom line is that if the voltage levels are compatible then you can go wrong at will and nothing will burn.

. In Uno they made such a joke and swapped the Rx and TX designations on the board, hence the confusion. This was supposed to make life easier for beginners - they were supposed to remember that to the RX on the Uno board (which is actually a TX) you have to connect the RX from the external circuit . In ESP, the RX/TX designations are correct.

Exactly like the Chinese one and all you had to do was teach the young ones what is Tx and what is Rx and problem solved.

ESP8266 to Arduino Uno and USB-UART converter connections: TX to RX or TX to TX?

byash 948 4

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#1 19404698 27 Apr 2021 21:52

byash byash

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Post #1
19404698 27 Apr 2021 21:52

Hello

I am looking through the wiring diagrams of ESP8266 to Arduino Uno and ESP8266 to USB-UART converter. And I see that sometimes TX is connected to RX and sometimes also to TX . The same applies to the RX . I mainly see this when connecting ESP to Arduino. What is the relationship ie when TX to RX and when TX to TX . Does it have something to do with the Arduino reset to GND ?

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#2 19404750 27 Apr 2021 22:22

Anonymous Anonymous

Level 1

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Post #2
19404750 27 Apr 2021 22:22

Tx - transmitter
Rx - receiver

Always Tx with Rx, never otherwise.

Unfortunately, in such a "free" flow of information, mistakes are often made that nobody verifies. Even some Chinese devices have the pins inverted (described, for example, "here connect Rx and here connect Tx" instead of "this is Rx and this is TX).

However, as a rule of thumb - one transmits and the other receives from here T ransmitter x to R eceiver x .
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#3 19404795 27 Apr 2021 22:39

xury xury

Automation specialist

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Post #3
19404795 27 Apr 2021 22:39

The bottom line is that if the voltage levels are compatible then you can go wrong at will and nothing will burn.
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#4 19404826 27 Apr 2021 22:55

khoam khoam

Level 42

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Post #4
19404826 27 Apr 2021 22:55

byash wrote:
Mainly I see this when connecting ESP to Arduino.
.
In Uno they made such a "joke" and swapped the Rx and TX designations on the board, hence the confusion. This was supposed to make life easier for beginners - they were supposed to remember that to the RX on the Uno board (which is actually a TX) you have to connect the RX from the external circuit .
In ESP, the RX/TX designations are correct.
#5 19404864 27 Apr 2021 23:17

Anonymous Anonymous

Level 1

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Post #5
19404864 27 Apr 2021 23:17

khoam wrote:
... This was supposedly to make life easier for beginners - they were supposed to remember that you have to connect the RX from the external circuit to the RX on the Uno board (which is actually a TX)
...

Exactly like the Chinese one and all you had to do was "teach the young ones" what is Tx and what is Rx and problem solved.
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ESP8266 to Arduino Uno and USB-UART converter connections: TX to RX or TX to TX?

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