SoftwareSerial Library Compatibility
An additional software serial port on digital pins.
- Pinned version
- 1.0
- Last matching compile evidence
- 2026-10-25
- Toolchain
- avr-gcc-wasm@0.2.0
- Primary headers
- SoftwareSerial.h
Dependencies and practical limits
An additional software serial port on digital pins.
Additional software UART pins and reliable rates depend on the board, interrupts and other timing-sensitive libraries.
A software UART is an external pin interface. It does not create an extra browser USB port.
No additional catalog dependencies are required.
For a missing header, first compare the include to the example below. For an undeclared identifier, inspect the first diagnostic and selected board rather than changing every library version.
Board compile matrix
These are recorded compile/link results for the current build and exact source hash. UNTESTED means no matching proof, not an assumed pass. Memory values belong to the listed example and exclude runtime stack/heap or dynamic buffers.
| Board/profile | Result | Flash bytes | Static SRAM bytes | Last tested |
|---|---|---|---|---|
| Arduino Uno R3 — ATmega328P | PASS | 3466 | 301 | 2026-10-25 |
| Arduino Nano V3 — ATmega328P (new bootloader) | PASS | 3466 | 301 | 2026-10-25 |
| Arduino Nano V3 — ATmega328P (old bootloader) | PASS | 3466 | 301 | 2026-10-25 |
| ATmega328PB — 16 MHz | PASS | 3678 | 301 | 2026-10-25 |
| Arduino Mega 2560 — ATmega2560 | PASS | 4362 | 301 | 2026-10-25 |
| Arduino Leonardo — ATmega32U4 · native USB | PASS | 6170 | 267 | 2026-10-25 |
| Arduino Micro — ATmega32U4 · native USB | PASS | 6172 | 267 | 2026-10-25 |
| Arduino Pro Mini — 5 V · 16 MHz | PASS | 3466 | 301 | 2026-10-25 |
| Arduino Pro Mini — 3.3 V · 8 MHz | PASS | 3454 | 301 | 2026-10-25 |
Build: e0f6d304cce4ae0a0989a9b1300cbc1a21a595e5e3e7f57ed0ab3468ecf7940b. Library source hash: 3ff256d6124ab7c791535d64c6333115e2c001e697e2205c081e5440ba7d4084. Compilation does not certify physical peripherals, timing or USB upload.
SoftwareSerial example
This is the actual pinned example available in Circuitera. Pin choices and wiring in a general example use Uno unless otherwise stated; review the selected board reference for other targets.
#include <SoftwareSerial.h>
SoftwareSerial device(10, 11); // RX, TX; connect to a compatible serial device.
void setup() { Serial.begin(9600); device.begin(9600); }
void loop() {
if (device.available()) Serial.write(device.read());
if (Serial.available()) device.write(Serial.read());
}
Projects using SoftwareSerial
No validated public tutorial currently uses this library. The example demonstrates compilation; no working simulator peripheral or hardware project is implied.
Upstream source and documentation ↗
Read the test methodology →