Softwareserial.h Library _top_ 〈SECURE〉

You can create multiple instances, but only one can receive at a time . The active receiver is set by the last call to listen() .

void loop() if (gps.available()) char c = gps.read(); Serial.print(c); // Echo GPS data to Serial Monitor softwareserial.h library

void setup() Serial.begin(9600); // Hardware serial for debug gps.begin(9600); // GPS module baud rate You can create multiple instances, but only one

#include <SoftwareSerial.h> For ESP8266/ESP32, note that they have a different SoftwareSerial implementation (often renamed or not available due to better hardware serial options). Constructor SoftwareSerial mySerial(RX_pin, TX_pin); // Example: RX on pin 10, TX on pin 11 SoftwareSerial gpsSerial(10, 11); Essential Methods | Method | Description | |--------|-------------| | begin(baud) | Initializes the software serial port. | | available() | Returns number of bytes ready to read. | | read() | Reads one byte (-1 if none). | | write(data) | Sends a byte (or string via print() / println() ). | | listen() | Enables this port for reception (if multiple ports exist). | | isListening() | Checks if this port is active. | | overflow() | Returns true if data was lost due to buffer overflow (64-byte buffer). | Simple Example: GPS Module #include <SoftwareSerial.h> SoftwareSerial gps(10, 11); // RX=10, TX=11 | | write(data) | Sends a byte (or

1. Introduction: The Hardware Limitation Every Arduino enthusiast eventually hits the wall: "I only have one hardware serial port (pins 0 and 1), but I need to connect two serial devices."

SoftwareSerial port1(2, 3); SoftwareSerial port2(4, 5); void setup() port1.begin(9600); port2.begin(9600); port1.listen(); // port1 is active