Low memory available

i'm getting warning, low memory available, stability problems may occur. have hc-sr04 sensor, adafruit ultimate gps module, , sd card reader on uno. should switch mega? i'll post code. thanks!

code: [select]


#include <newping.h>
#include <adafruit_gps.h>
#include <softwareserial.h>
#include <sd.h>
#include <spi.h>
softwareserial myserial(3,2);
adafruit_gps gps(&myserial);

char c;
string nmea1;
string nmea2;

#define trigger_pin 6
#define echo_pin 7
#define max_distance 200
#define pingspeed 1000
#define chipselect 4
unsigned long pingtimer1, pingtimer2, pingtimer3;
newping sonar(6,7,65);

file myfile;

void setup() {
  serial.begin(115200);
  pingtimer1 = millis() + pingspeed;
  pingtimer2 = pingtimer1 + (pingspeed/2);
  pingtimer3= pingtimer2 + pingspeed;
  gps.begin(9600);
  gps.sendcommand("$pgcmd,33,0*6d");
  gps.sendcommand(pmtk_set_nmea_update_1hz);
  gps.sendcommand(pmtk_set_nmea_output_rmcgga);

  if(!sd.begin(4)) {
    serial.println("not beginning");
    return;
  }
  serial.println("its working");
  pinmode(10,output);
 
  sd.remove("ultrad.txt");
  if(!sd.remove("ultrad.txt")){
    serial.println("ultra not working");
    return;
  }
  sd.remove("gps.txt");
  if(!sd.remove("gps.txt")){
  serial.println("gps not working");
  return;
  }
}

void loop() {

if(millis()>= pingtimer1) {
  pingtimer1 += pingspeed;
  ping();
}

if (millis() >= pingtimer2) {
  pingtimer2 = pingtimer1 + (pingspeed/2);
  gpsdata();
}

if (millis() >= pingtimer3) {
  pingtimer3 = pingtimer2 + pingspeed;
  sdcard();
}
}

void ping(){
 delay(50);
 int us=sonar.ping();
 serial.print("ping: ");
 serial.print(us/us_roundtrip_cm);
 serial.println("cm");
}

void gpsdata() {
   
  cleargps();
  while(!gps.newnmeareceived()) { //loop until have nmea sentence
    c=gps.read();
  }
  gps.parse(gps.lastnmea()); //parse last nmea sentence
  nmea1=gps.lastnmea();

  while(!gps.newnmeareceived()) { //loop until have nmea sentence
    c=gps.read();
  }
  gps.parse(gps.lastnmea()); //parse last nmea sentence
  nmea2=gps.lastnmea();

  serial.print(gps.latitude);
  serial.print(",");
  serial.println(gps.longitude);
  serial.print(gps.hour, dec);serial.print(':');
  serial.println(gps.minute, dec);

 
 
}

void cleargps() {

   while(!gps.newnmeareceived()) { //loop until have nmea sentence
    c=gps.read();
  }
  gps.parse(gps.lastnmea()); //parse last nmea sentence
  while(!gps.newnmeareceived()) { //loop until have nmea sentence
    c=gps.read();
  }
  gps.parse(gps.lastnmea()); //parse last nmea sentence
   while(!gps.newnmeareceived()) { //loop until have nmea sentence
    c=gps.read();
}
}

void sdcard(){
  int us=sonar.ping();
  myfile = sd.open("ultrad.txt", file_write);
  myfile.print(us/us_roundtrip_cm);
  myfile.print(",");
  myfile.println("cm");
  myfile.println(millis());   
  myfile.close();

 
 
  myfile = sd.open("gps.txt", file_write);
  myfile.print(gps.latitude);
  myfile.print(",");
  myfile.print(gps.longitude);
  myfile.print(",");
  myfile.print(gps.hour, dec);myfile.print(':');
  myfile.println(gps.minute, dec); 
  myfile.close();
}



or '1284p 16k sram.
two hardware serial ports software serial not needed. offer boards in several form factors.
http://www.crossroadsfencing.com/bobuinorev17/

this one's little more decked out - onboard or offboard usb/serial adapter, sd card, battery backed rtc, rs232 buffer available 2nd serial port. lots of signal, power, gnd connections available , prototyping area too.

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