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Merge pull request arduino#970 from arduino/karlsoderby/serial-table-…
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Serial Table Update
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@karlsoderby
karlsoderby authored Feb 20, 2024
2 parents 5bbdfd4 + 79e593c commit 17d3f40
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38 changes: 26 additions & 12 deletions Language/Functions/Communication/Serial.adoc
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Expand Up @@ -17,21 +17,35 @@ Used for communication between the Arduino board and a computer or other devices
[options="header"]

|================================================================================================================================================
| Board | Serial pins | Serial1 pins | Serial2 pins | Serial3 pins
| UNO R3, UNO R3 SMD Mini | 0(RX), 1(TX) | | |
| UNO R4 Minima, UNO R4 WiFi| 18(RX), 17(TX) | | |
| Leonardo, Micro, Yún Rev2 | 0(RX), 1(TX) | | |
| Uno WiFi Rev.2 | 0(RX), 1(TX) | | |
| 101 | 0(RX), 1(TX) | | |
| MKR boards | 13(RX), 14(TX) | | |
| Nano boards | 0(RX), 1(TX) | | |
| Zero | 0(RX), 1(TX) | | |
| Due | 0(RX), 1(TX) | 19(RX1), 18(TX1) | 17(RX2), 16(TX2) | 15(RX3), 14(TX3)
| GIGA R1 WiFi | 0(RX), 1(TX) | 19(RX1), 18(TX1) | 17(RX2), 16(TX2) | 15(RX3), 14(TX3)
| Mega 2560 Rev3 | 0(RX), 1(TX) | 19(RX1), 18(TX1) | 17(RX2), 16(TX2) | 15(RX3), 14(TX3)
| Board | Serial pins | Serial1 pins | Serial2 pins | Serial3 pins | Serial4 pins
| UNO R3, UNO R3 SMD Mini | 0(RX), 1(TX) | | | |
| Nano (classic) | 0(RX), 1(TX) | | | |
| UNO R4 Minima, UNO R4 WiFi| | 0(RX0), 1(TX0) | | |
| Leonardo, Micro, Yún Rev2 | | 0(RX), 1(TX) | | |
| Uno WiFi Rev.2 | | 0(RX), 1(TX) | | |
| MKR boards | | 13(RX), 14(TX) | | |
| Zero | | 0(RX), 1(TX) | | |
| GIGA R1 WiFi | | 0(RX), 1(TX) | 19(RX1), 18(TX1) | 17(RX2), 16(TX2) | 15(RX3), 14(TX3)
| Due | 0(RX), 1(TX) | 19(RX1), 18(TX1) | 17(RX2), 16(TX2) | 15(RX3), 14(TX3) |
| Mega 2560 Rev3 | 0(RX), 1(TX) | 19(RX1), 18(TX1) | 17(RX2), 16(TX2) | 15(RX3), 14(TX3) |
| Nano 33 IoT | | 0(RX0), 1(TX0) | | |
| Nano RP2040 Connect | | 0(RX0), 1(TX0) | | |
| Nano BLE / BLE Sense | | 0(RX0), 1(TX0) | | |
|================================================================================================================================================


[options="header"]

The Nano ESP32 board is an exception due to being based on the ESP32 core. Here, `Serial0` refers to `RX0` and `TX0`, while `Serial1` and `Serial2` are additional ports that can be assigned to any free GPIO.

|================================================================================================================================================
| Board | Serial0 pins | Serial1 pins | Serial2 pins | Serial3 pins | Serial4 pins
| Nano ESP32 | 0(RX0), 1(TX0) | Any free GPIO | Any free GPIO | |
|================================================================================================================================================

You can read more about configuring the Nano ESP32's additional serial ports in https://docs.arduino.cc/tutorials/nano-esp32/cheat-sheet/#uart[this article].

[%hardbreaks]
On older boards (Uno, Nano, Mini, and Mega), pins 0 and 1 are used for communication with the computer. Connecting anything to these pins can interfere with that communication, including causing failed uploads to the board.
[%hardbreaks]
You can use the Arduino environment's built-in serial monitor to communicate with an Arduino board. Click the serial monitor button in the toolbar and select the same baud rate used in the call to `begin()`.
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