问更新-通过Atlas科学硬件串口扩展器连接到Arduino Uno的传感器问题8:1

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#include <SoftwareSerial.h>                           //we have to include the SoftwareSerial library, or else we can't use it
#define rx 3                                         //define what pin rx is going to be
#define tx 2                                          //define what pin tx is going to be
SoftwareSerial mySerial(rx, tx);                      //define how the soft serial port is going to work
#include <TinyGPS.h>
#include <NMEAGPS.h>
int s1 = 6;                                           //Arduino pin 6 to control pin S1
int s2 = 5;                                           //Arduino pin 5 to control pin S2
int s3 = 4;                                           //Arduino pin 4 to control pin S3
int i;
const uint8_t module_count = 8;                       //number of modules connected to the serial port expander 1=Port1, 2= Port2 and so on
TinyGPS  gps;
gps_fix fix;
long lat, lon;

void setup() {
  Serial.begin(9600);                                 //Set the hardware serial port to 115200
  mySerial.begin(9600);                               //set baud rate for the software serial port to 9600

  pinMode(s1, OUTPUT);                                //Set the digital pin as output
  pinMode(s2, OUTPUT);                                //Set the digital pin as output
  pinMode(s3, OUTPUT);                                //Set the digital pin as output

}

void loop() {
  if (Serial.available()) {                           //if we get data from the computer
    char c = Serial.read();
    for (uint8_t i = 1; i <= module_count; i++) {    // loop through the modules
      Serial.print("Connecting to Port: ");
      Serial.println(i);
      open_port(i);                                  // open the port
      Serial.print(c);                             //print character to port
      delay(1000);                                    //insert a delay to wait for the reply
      //Serial.println(Serial.available());
      if (Serial.available()) {
        //Serial.println(gps.available(Serial));//print reply to serial monitor
        while (Serial.available()) {
          //Serial.write(mySerial.read());
          //Serial.write(gps.encode(mySerial.read()));
          //Serial.println(mySerial.available());
          //Serial.println(gps.encode(mySerial.read()));
          if (mySerial.available()>0) {
            //Serial.println(gps.encode(mySerial.read()));
            char d = byte(mySerial.read());
            //Serial.println(d);
            if (gps.encode(d)) {
              gps.get_position(&lat, &lon);
              Serial.print("Position:");
              Serial.print("lat:"); Serial.print(lat); Serial.print(" ");
              Serial.print("long:"); Serial.println(lon);
            }
          }

        }
        Serial.println();
      }
    }
  }
}




void open_port(uint8_t _port) {                                  //this function controls what port is opened on the serial port expander

  if (_port < 1 || module_count > 8)_port = 1;                //if the value of the port is within range (1-8) then open that port. If it's not in range set it to port 1
  uint8_t port_bits = _port - 1;

  digitalWrite(s1, bitRead(port_bits, 0));               //Here we have two commands combined into one.
  digitalWrite(s2, bitRead(port_bits, 1));               //The digitalWrite command sets a pin to 1/0 (high or low)
  digitalWrite(s3, bitRead(port_bits, 2));               //The bitRead command tells us what the bit value is for a specific bit location of a number
  delay(2);                                         //this is needed to make sure the channel switching event has completed
}