<p>You can solder cables to the RX, TX and GND pins on the mainboard.</p>
<p>There are tutorials on Youtube that describe this.</p>

CC BY-SA 4.0
2023-05-17T07:49:31.260Z
2023-05-17T16:49:04.003Z
2023-05-17T16:49:04.003Z
Rob
<p>I want to connect an Arduino or similar MCU board to an Ender 3 mainboard and make them communicate. I don't want to use USB. Are there any pins on the controller boards to achieve this?</p>
<p>I found in the Marlin G-code reference the <code>M118</code> (serial print) command, this is ideal for my need, but I don't know to catch its serial messages on the mainboard.</p>

<creality-ender-3><electronics><arduino><serial-connection>
Is it possible to send/receive serial messages from/to Ender 3 mainboards (not USB!)?
Denatural
# Is it possible to send/receive serial messages from/to Ender 3 mainboards (not USB!)?

(Asked by: username_0 on 2022-06-03)

I want to connect an Arduino or similar MCU board to an Ender 3 mainboard and make them communicate. I don't want to use USB. Are there any pins on the controller boards to achieve this?

I found in the Marlin G-code reference the `M118` (serial print) command, this is ideal for my need, but I don't know to catch its serial messages on the mainboard.

**Tags:** creality-ender-3, electronics, arduino, serial-connection


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## 1 answers

### Answer by username_1 on 2023-05-17. Score: 3

You can solder cables to the RX, TX and GND pins on the mainboard.

There are tutorials on Youtube that describe this.


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