void loop() if (gps.available()) char c = gps.read(); Serial.print(c); // Echo GPS data to Serial Monitor
// Find this line: #define _SS_MAX_RX_BUFF 64 // Change to 128 or 256 (uses more RAM) Don't. Both rely on precise timing and disabling interrupts. They are incompatible. Use hardware serial or an I2C/SPI serial bridge (e.g., SC16IS750). 10. Alternatives to SoftwareSerial | Alternative | Pros | Cons | |-------------|------|------| | HardwareSerial (Serial1, Serial2 on Mega) | Reliable, full-duplex, high speed | Limited ports | | AltSoftSerial (Paul Stoffregen) | Better timing, supports 57600 baud | Fixed pins (8=RX, 9=TX on Uno) | | NeoSWSerial | Interrupt-driven, allows multiple RX | Still software-based | | I2C/SPI UART modules (e.g., MAX3100) | Frees CPU, many ports | Extra hardware cost | | Use a second Arduino as serial bridge | Very flexible | Complex, power hungry | 11. Full Example: GPS + Bluetooth on Uno #include <SoftwareSerial.h> SoftwareSerial gps(10, 11); // GPS module SoftwareSerial bluetooth(8, 9); // HC-05 Bluetooth softwareserial.h library
#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 void loop() if (gps
void checkForData(SoftwareSerial &ss) ss.listen(); if (ss.available()) // Process Use hardware serial or an I2C/SPI serial bridge (e
void setup() Serial.begin(9600); // Debug console gps.begin(9600); bluetooth.begin(38400); // Common HC-05 default gps.listen(); // Listen to GPS first