I'm working on a setup to record GPS data and a distance recording from a laser sensor. I mounted an Adafruit Ultimate GPS+Logging Shield on an Arduino Uno. The laser scanner (LiDAR Lite v3) is connected via the SCA and SCL pins to the UNO.
I'm not really experienced with Arduino programming, so I grabbed examples of both the GPS logging and the LiDARLite and merged them together.
Without the LiDAR, I'm able to let this setup log NMEA strings on the SD card, but when I load the LiDARLite library, it won't make a new textfile to write the data to. The distance measurement from the LiDAR is received though (checked via serial monitor).
Could there be some conflict between the GPS shield and LiDAR that the SCA can't be used in combination with GPS logging?
This is the script I'm currently running.
#include <SPI.h>
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
#include <SD.h>
#include <avr/sleep.h>
#include <LIDARLite.h>
// Ladyada's logger modified by Bill Greiman to use the SdFat library
//
// This code shows how to listen to the GPS module in an interrupt
// which allows the program to have more 'freedom' - just parse
// when a new NMEA sentence is available! Then access data when
// desired.
//
// Tested and works great with the Adafruit Ultimate GPS Shield
// using MTK33x9 chipset
// ------> http://www.adafruit.com/products/
// Pick one up today at the Adafruit electronics shop
// and help support open source hardware & software! -ada
// Fllybob added 10 sec logging option
SoftwareSerial mySerial(7, 8);
Adafruit_GPS GPS(&mySerial);
LIDARLite lidarLite; // assign variable to LIDARLite module
int cal_cnt = 0; // variable that keeps track of the amount of loops (used by LiDARLite)
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences
#define GPSECHO true
/* set to true to only log to SD when GPS has a fix, for debugging, keep it false */
#define LOG_FIXONLY false
// this keeps track of whether we're using the interrupt
// off by default!
#ifndef ESP8266 // Sadly not on ESP8266
boolean usingInterrupt = false;
#endif
// Set the pins used
#define chipSelect 10
#define ledPin 13
File logfile;
// read a Hex value and return the decimal equivalent
uint8_t parseHex(char c) {
if (c < '0')
return 0;
if (c <= '9')
return c - '0';
if (c < 'A')
return 0;
if (c <= 'F')
return (c - 'A')+10;
}
// blink out an error code
void error(uint8_t errno) {
/*
if (SD.errorCode()) {
putstring("SD error: ");
Serial.print(card.errorCode(), HEX);
Serial.print(',');
Serial.println(card.errorData(), HEX);
}
*/
while(1) {
uint8_t i;
for (i=0; i<errno; i++) {
digitalWrite(ledPin, HIGH);
delay(100);
digitalWrite(ledPin, LOW);
delay(100);
}
for (i=errno; i<10; i++) {
delay(200);
}
}
}
void setup() {
// for Leonardos, if you want to debug SD issues, uncomment this line
// to see serial output
//while (!Serial);
// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
// also spit it out
Serial.begin(115200);
Serial.println("\r\nUltimate GPSlogger Shield");
pinMode(ledPin, OUTPUT);
// make sure that the default chip select pin is set to
// output, even if you don't use it:
pinMode(10, OUTPUT);
if (!SD.begin(chipSelect)) {
Serial.println("Card init. failed!");
error(2);
}
char filename[15];
strcpy(filename, "GPSLOG00.TXT");
for (uint8_t i = 0; i < 100; i++) {
filename[6] = '0' + i/10;
filename[7] = '0' + i%10;
// create if does not exist, do not open existing, write, sync after write
if (! SD.exists(filename)) {
break;
}
}
logfile = SD.open(filename, FILE_WRITE);
if( ! logfile ) {
Serial.print("Couldnt create ");
Serial.println(filename);
error(3);
}
Serial.print("Writing to ");
Serial.println(filename);
// connect to the GPS at the desired rate
GPS.begin(9600);
lidarLite.begin(0, true); // Set configuration to default and I2C to 400 kHz
lidarLite.configure(0); // Change this number to try out alternate configurations
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
// GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// For logging data, we don't suggest using anything but either RMC only or RMC+GGA
// to keep the log files at a reasonable size
// Set the update rate
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_5HZ); // 100 millihertz (once every 10 seconds), 1Hz or 5Hz update rate
// Turn off updates on antenna status, if the firmware permits it
GPS.sendCommand(PGCMD_NOANTENNA);
// the nice thing about this code is you can have a timer0 interrupt go off
// every 1 millisecond, and read data from the GPS for you. that makes the
// loop code a heck of a lot easier!
#ifndef ESP8266 // Not on ESP8266
useInterrupt(false);
#endif
Serial.println("Ready!");
}
// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
#ifndef ESP8266 // Not on ESP8266
ISR(TIMER0_COMPA_vect) {
char c = GPS.read();
// if you want to debug, this is a good time to do it!
#ifdef UDR0
if (GPSECHO)
if (c) UDR0 = c;
// writing direct to UDR0 is much much faster than Serial.print
// but only one character can be written at a time.
#endif
}
void useInterrupt(boolean v) {
if (v) {
// Timer0 is already used for millis() - we'll just interrupt somewhere
// in the middle and call the "Compare A" function above
OCR0A = 0xAF;
TIMSK0 |= _BV(OCIE0A);
usingInterrupt = true;
}
else {
// do not call the interrupt function COMPA anymore
TIMSK0 &= ~_BV(OCIE0A);
usingInterrupt = false;
}
}
#endif // ESP8266
void loop() {
int dist;
// At the beginning of every 100 readings,
// take a measurement with receiver bias correction
if ( cal_cnt == 0 ) {
dist = lidarLite.distance(); // With bias correction
} else {
dist = lidarLite.distance(false); // Without bias correction
}
// Increment reading counter
cal_cnt++;
cal_cnt = cal_cnt % 100;
Serial.print(lidarLite.distance());
if (! usingInterrupt) {
// read data from the GPS in the 'main loop'
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if (GPSECHO)
if (c) Serial.print(c);
Serial.print(dist);
}
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trying to print out data
// Don't call lastNMEA more than once between parse calls! Calling lastNMEA
// will clear the received flag and can cause very subtle race conditions if
// new data comes in before parse is called again.
char *stringptr = GPS.lastNMEA();
if (!GPS.parse(stringptr)) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
// Sentence parsed!
Serial.println("OK");
if (LOG_FIXONLY && !GPS.fix) {
Serial.print("No Fix");
return;
}
// Rad. lets log it!
Serial.println("Log");
uint8_t stringsize = strlen(stringptr);
if (stringsize != logfile.write((uint8_t *)stringptr, stringsize)) //write the string to the SD file
error(4);
if (strstr(stringptr, "RMC") || strstr(stringptr, "GGA")) logfile.flush();
Serial.println();
}
}
