user49781: I am doing a project right now that involves a Neo 6M GPS module, a micro sd card module and 6 BH1750 light sensors. All the modules work fine when testing them standalone, especially the GPS module works as it should with TinyGPS++ example sketches.
When i run the "DeviceExample" sketch, it takes around 6 seconds to revieve time and around 10 seconds to recieve the location. However in my own sketch it only updates time every 3 or more seconds as well as i think it also updates location very slow.
Sometimes it even works for a short time, sometimes it never works, no matter how long the sketch runs.
Here is an example log:
As you can see, the sketch did not retrieve full date 20 secs after starting, but time is updating every second. Yet you can see that the time isn't updated anymore 5 seconds before the module is retrieving location and then the update interval gets slowed down, even though the module itself still indicates the update interval of around .5-1 second.
The Neo 6M GPS module is connected directly to RX,TX,GND,VCC and works fine with the example sketches. Has anybody a solution to this?
ms(), longitude, latitude,month,day,year,hour,min,sec,centisecs,alt,6 lux values
17642, 0.000000, 0.000000,0,0,2000,22,26,13,95,0.00,106,106,6,0,3,106,
17980, 0.000000, 0.000000,0,0,2000,22,26,13,95,0.00,106,106,6,0,3,106,
18333, 0.000000, 0.000000,0,0,2000,22,26,13,95,0.00,106,106,6,0,3,106,
18803, 0.000000, 0.000000,0,0,2000,22,26,14,95,0.00,106,106,6,0,3,93,
19131, 0.000000, 0.000000,0,0,2000,22,26,14,95,0.00,33,33,6,0,3,0,
19530, 0.000000, 0.000000,0,0,2000,22,26,14,95,0.00,0,0,6,0,3,40,
19956, 0.000000, 0.000000,0,0,2000,22,26,15,95,0.00,106,106,6,0,3,106,
20311, 0.000000, 0.000000,0,0,2000,22,26,15,95,0.00,106,106,6,0,3,106,
20787, 0.000000, 0.000000,0,0,2000,22,26,16,95,0.00,106,106,6,0,3,106,
21114, 0.000000, 0.000000,0,0,2000,22,26,16,95,0.00,106,106,6,0,3,106,
21504, 0.000000, 0.000000,0,0,2000,22,26,16,95,0.00,106,106,6,0,3,106,
21942, 0.000000, 0.000000,0,0,2000,22,26,17,95,0.00,106,106,6,0,3,106,
22292, 0.000000, 0.000000,0,0,2000,22,26,17,95,0.00,106,106,6,0,3,106,

...
240540, 0.000000, 0.000000,10,14,2018,22,29,56,95,0.00,106,106,6,0,3,106,
240869, 0.000000, 0.000000,10,14,2018,22,29,56,95,0.00,106,106,6,0,3,106,
241249, 0.000000, 0.000000,10,14,2018,22,29,56,95,0.00,106,106,6,0,3,106,
241697, 0.000000, 0.000000,10,14,2018,22,29,57,95,0.00,106,106,6,0,3,106,
242035, 0.000000, 0.000000,10,14,2018,22,29,57,95,0.00,106,106,6,0,3,106,
242531, 0.000000, 0.000000,10,14,2018,22,29,58,95,0.00,109,109,6,0,3,106,
242859, 0.000000, 0.000000,10,14,2018,22,29,58,95,0.00,106,106,6,0,3,106,
243238, 0.000000, 0.000000,10,14,2018,22,29,58,95,0.00,106,106,6,0,3,106,
243687, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
244016, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
244425, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
244892, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
245260, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
245754, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
246083, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
246494, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,109,6,0,3,106,
246947, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,109,109,6,0,3,106,
247320, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
247820, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,109,106,6,0,3,106,
248160, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
248676, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
249027, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
249425, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
249889, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,109,6,0,3,106,
250253,xxxxx,xxxxx,10,14,2018,22,30,6,0,0.00,106,106,6,0,3,106,
250768,xxxxx,xxxxx,10,14,2018,22,30,6,0,0.00,106,106,6,0,3,106,
251097,xxxxx,xxxxx,10,14,2018,22,30,6,0,0.00,106,106,6,0,3,106,
251608,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,109,106,6,0,3,106,
252021,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
252412,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
252883,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,109,106,6,0,3,106,
253248,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
253765,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
254094,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
254608,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,109,6,0,3,106,
255020,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,106,6,0,3,106,
255412,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,106,6,0,3,106,
255882,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,106,6,0,3,106,

Here is the sketch:
////
//initialising constants
static const  int out_min = 5;
static const  int out_max = 10;
static
const uint8_t RXPin = 0,
              TXPin = 1;
static
const uint16_t GPSBaud = 9600;
static
const uint16_t chipSelect = 4;
//initialising Objects
SoftwareSerial ss(RXPin, TXPin);
TinyGPSPlus gps;

BH1750 active_sensor(0x23); // We will use this adress for stating the active sensor
BH1750 inactive_sensor(0x5C);
SdFat sd;
SdFile file;

//initialising variables for collecting data
float lng_;
float lat_;

String month_ = "";
String day_ = "";
String year_ = "";

uint16_t lux_ = 0;
uint8_t hour_ = 0;
uint8_t min_ = 0;
uint8_t second_ = 0;
uint8_t centisecond_ = 0;
float altitude_ = 0;

unsigned long runtime_ = 0;

uint16_t values[6];
char buf[6];
char data_buffer[12];
char fileName[13] = FILE_BASE_NAME "00.csv";
uint8_t lines = 0;


void setup() {
  digitalWrite(2, HIGH);
  pinMode(2, INPUT);
  Serial.begin(115200);
  Wire.begin();

  pinMode(3, OUTPUT);
  digitalWrite(3, LOW);


  for (int i = out_min; i <= out_max; i++)
  {
    pinMode(i, OUTPUT);
    digitalWrite(i, LOW);
  }

  ss.begin(GPSBaud); 


  if (active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
   Serial.println(F("BH1750 Advanced begin"));
  } else {
    Serial.println(F("Error initialising BH1750"));
  }
}

void(* resetFunc) (void) = 0;
void loop() {

  while (ss.available() > 0)
    if (gps.encode(ss.read())) {
      digitalWrite(3, HIGH);  
    }
  if (millis() > 5000 && gps.charsProcessed() < 10) {
    while (true);
  }
  if (gps.location.isValid()) {
    lat_ = gps.location.lat();
    lng_ = gps.location.lng();
  }

  if (gps.date.isValid()) {
    day_ = gps.date.day();
    month_ = gps.date.month();
    year_ = gps.date.year();
  }

  if (gps.time.isValid()) {
    hour_ = gps.time.hour();
    min_ = gps.time.minute();
    second_ = gps.time.second();
    centisecond_ = gps.time.centisecond();
    altitude_ = gps.altitude.meters();
  }

  int i;
  for (i = 5; i <= 10; i++) {
    digitalWrite(i, LOW);
    switch (i) {
      case 7:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE);
      case 8:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE);
      case 9:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE_2);
      case 10:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE_2);
      case 5:
        active_sensor.begin(BH1750::CONTINUOUS_LOW_RES_MODE);
      case 6:
        active_sensor.begin(BH1750::CONTINUOUS_LOW_RES_MODE);
    }
    delay(15);
    lux_ = active_sensor.readLightLevel();
    values[i - 5] = lux_;
    digitalWrite(i, HIGH);
  }
  delay(10);
  digitalWrite(3, LOW);
  delay(5);
  file.print(millis());
  file.write(',');
  dtostrf(lng_, 9, 6, data_buffer);
  file.print(data_buffer);
  file.write(',');
  dtostrf(lat_, 9, 6, data_buffer);
  file.print(data_buffer);
  file.write(',');

  file.print(month_);
  file.write(',');
  file.print(day_);
  file.write(',');
  file.print(year_);
  file.write(',');

  file.print(hour_);
  file.write(',');
  file.print(min_);
  file.write(',');
  file.print(second_);
  file.write(',');
  file.print(centisecond_);
  file.write(',');
  file.print(altitude_);
  file.write(',');

  for (int i = 0; i <= 5; i++) {
    file.print(values[i]);
    file.write(',');
  }
  file.println();
  lines++;

  int state = digitalRead(2);

}

Example Output:

user4143: You can't (and certainly shouldn't ever even try to) use SoftwareSerial on pins 0 and 1. Not when you're using Serial, since they are the same pins.
Pick a different pair of pins for your GPS connection.

49781: <p>I am doing a project right now that involves a Neo 6M GPS module, a micro sd card module and 6 BH1750 light sensors. All the modules work fine when testing them standalone, especially the GPS module works as it should with TinyGPS++ example sketches.
When i run the "DeviceExample" sketch, it takes around 6 seconds to revieve time and around 10 seconds to recieve the location. However in my own sketch it only updates time every 3 or more seconds as well as i think it also updates location very slow.</p>

<p>Sometimes it even works for a short time, sometimes it never works, no matter how long the sketch runs.
Here is an example log:
As you can see, the sketch did not retrieve full date 20 secs after starting, but time is updating every second. Yet you can see that the time isn't updated anymore 5 seconds before the module is retrieving location and then the update interval gets slowed down, even though the module itself still indicates the update interval of around .5-1 second.</p>

<p>The Neo 6M GPS module is connected directly to RX,TX,GND,VCC and works fine with the example sketches. Has anybody a solution to this?</p>

<pre><code>ms(), longitude, latitude,month,day,year,hour,min,sec,centisecs,alt,6 lux values
17642, 0.000000, 0.000000,0,0,2000,22,26,13,95,0.00,106,106,6,0,3,106,
17980, 0.000000, 0.000000,0,0,2000,22,26,13,95,0.00,106,106,6,0,3,106,
18333, 0.000000, 0.000000,0,0,2000,22,26,13,95,0.00,106,106,6,0,3,106,
18803, 0.000000, 0.000000,0,0,2000,22,26,14,95,0.00,106,106,6,0,3,93,
19131, 0.000000, 0.000000,0,0,2000,22,26,14,95,0.00,33,33,6,0,3,0,
19530, 0.000000, 0.000000,0,0,2000,22,26,14,95,0.00,0,0,6,0,3,40,
19956, 0.000000, 0.000000,0,0,2000,22,26,15,95,0.00,106,106,6,0,3,106,
20311, 0.000000, 0.000000,0,0,2000,22,26,15,95,0.00,106,106,6,0,3,106,
20787, 0.000000, 0.000000,0,0,2000,22,26,16,95,0.00,106,106,6,0,3,106,
21114, 0.000000, 0.000000,0,0,2000,22,26,16,95,0.00,106,106,6,0,3,106,
21504, 0.000000, 0.000000,0,0,2000,22,26,16,95,0.00,106,106,6,0,3,106,
21942, 0.000000, 0.000000,0,0,2000,22,26,17,95,0.00,106,106,6,0,3,106,
22292, 0.000000, 0.000000,0,0,2000,22,26,17,95,0.00,106,106,6,0,3,106,
</code></pre>

<p>...</p>

<pre><code>240540, 0.000000, 0.000000,10,14,2018,22,29,56,95,0.00,106,106,6,0,3,106,
240869, 0.000000, 0.000000,10,14,2018,22,29,56,95,0.00,106,106,6,0,3,106,
241249, 0.000000, 0.000000,10,14,2018,22,29,56,95,0.00,106,106,6,0,3,106,
241697, 0.000000, 0.000000,10,14,2018,22,29,57,95,0.00,106,106,6,0,3,106,
242035, 0.000000, 0.000000,10,14,2018,22,29,57,95,0.00,106,106,6,0,3,106,
242531, 0.000000, 0.000000,10,14,2018,22,29,58,95,0.00,109,109,6,0,3,106,
242859, 0.000000, 0.000000,10,14,2018,22,29,58,95,0.00,106,106,6,0,3,106,
243238, 0.000000, 0.000000,10,14,2018,22,29,58,95,0.00,106,106,6,0,3,106,
243687, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
244016, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
244425, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
244892, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
245260, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
245754, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
246083, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
246494, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,109,6,0,3,106,
246947, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,109,109,6,0,3,106,
247320, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
247820, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,109,106,6,0,3,106,
248160, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
248676, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
249027, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
249425, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,106,6,0,3,106,
249889, 0.000000, 0.000000,10,14,2018,22,29,59,95,0.00,106,109,6,0,3,106,
250253,xxxxx,xxxxx,10,14,2018,22,30,6,0,0.00,106,106,6,0,3,106,
250768,xxxxx,xxxxx,10,14,2018,22,30,6,0,0.00,106,106,6,0,3,106,
251097,xxxxx,xxxxx,10,14,2018,22,30,6,0,0.00,106,106,6,0,3,106,
251608,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,109,106,6,0,3,106,
252021,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
252412,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
252883,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,109,106,6,0,3,106,
253248,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
253765,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
254094,xxxxx,xxxxx,10,14,2018,22,30,8,0,646.30,106,106,6,0,3,106,
254608,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,109,6,0,3,106,
255020,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,106,6,0,3,106,
255412,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,106,6,0,3,106,
255882,xxxxx,xxxxx,10,14,2018,22,30,11,0,646.30,106,106,6,0,3,106,
</code></pre>

<p>Here is the sketch:</p>

<pre><code>////
//initialising constants
static const  int out_min = 5;
static const  int out_max = 10;
static
const uint8_t RXPin = 0,
              TXPin = 1;
static
const uint16_t GPSBaud = 9600;
static
const uint16_t chipSelect = 4;
//initialising Objects
SoftwareSerial ss(RXPin, TXPin);
TinyGPSPlus gps;

BH1750 active_sensor(0x23); // We will use this adress for stating the active sensor
BH1750 inactive_sensor(0x5C);
SdFat sd;
SdFile file;

//initialising variables for collecting data
float lng_;
float lat_;

String month_ = "";
String day_ = "";
String year_ = "";

uint16_t lux_ = 0;
uint8_t hour_ = 0;
uint8_t min_ = 0;
uint8_t second_ = 0;
uint8_t centisecond_ = 0;
float altitude_ = 0;

unsigned long runtime_ = 0;

uint16_t values[6];
char buf[6];
char data_buffer[12];
char fileName[13] = FILE_BASE_NAME "00.csv";
uint8_t lines = 0;


void setup() {
  digitalWrite(2, HIGH);
  pinMode(2, INPUT);
  Serial.begin(115200);
  Wire.begin();

  pinMode(3, OUTPUT);
  digitalWrite(3, LOW);


  for (int i = out_min; i &lt;= out_max; i++)
  {
    pinMode(i, OUTPUT);
    digitalWrite(i, LOW);
  }

  ss.begin(GPSBaud); 


  if (active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE)) {
   Serial.println(F("BH1750 Advanced begin"));
  } else {
    Serial.println(F("Error initialising BH1750"));
  }
}

void(* resetFunc) (void) = 0;
void loop() {

  while (ss.available() &gt; 0)
    if (gps.encode(ss.read())) {
      digitalWrite(3, HIGH);  
    }
  if (millis() &gt; 5000 &amp;&amp; gps.charsProcessed() &lt; 10) {
    while (true);
  }
  if (gps.location.isValid()) {
    lat_ = gps.location.lat();
    lng_ = gps.location.lng();
  }

  if (gps.date.isValid()) {
    day_ = gps.date.day();
    month_ = gps.date.month();
    year_ = gps.date.year();
  }

  if (gps.time.isValid()) {
    hour_ = gps.time.hour();
    min_ = gps.time.minute();
    second_ = gps.time.second();
    centisecond_ = gps.time.centisecond();
    altitude_ = gps.altitude.meters();
  }

  int i;
  for (i = 5; i &lt;= 10; i++) {
    digitalWrite(i, LOW);
    switch (i) {
      case 7:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE);
      case 8:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE);
      case 9:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE_2);
      case 10:
        active_sensor.begin(BH1750::CONTINUOUS_HIGH_RES_MODE_2);
      case 5:
        active_sensor.begin(BH1750::CONTINUOUS_LOW_RES_MODE);
      case 6:
        active_sensor.begin(BH1750::CONTINUOUS_LOW_RES_MODE);
    }
    delay(15);
    lux_ = active_sensor.readLightLevel();
    values[i - 5] = lux_;
    digitalWrite(i, HIGH);
  }
  delay(10);
  digitalWrite(3, LOW);
  delay(5);
  file.print(millis());
  file.write(',');
  dtostrf(lng_, 9, 6, data_buffer);
  file.print(data_buffer);
  file.write(',');
  dtostrf(lat_, 9, 6, data_buffer);
  file.print(data_buffer);
  file.write(',');

  file.print(month_);
  file.write(',');
  file.print(day_);
  file.write(',');
  file.print(year_);
  file.write(',');

  file.print(hour_);
  file.write(',');
  file.print(min_);
  file.write(',');
  file.print(second_);
  file.write(',');
  file.print(centisecond_);
  file.write(',');
  file.print(altitude_);
  file.write(',');

  for (int i = 0; i &lt;= 5; i++) {
    file.print(values[i]);
    file.write(',');
  }
  file.println();
  lines++;

  int state = digitalRead(2);

}
</code></pre>

<p>Example Output:</p>
 4143: <p>You can't (and certainly <em>shouldn't</em> ever even try to) use SoftwareSerial on pins 0 and 1. Not when you're using <code>Serial</code>, since they are the same pins.</p>

<p>Pick a different pair of pins for your GPS connection.</p>
