NEO7M saying "No GPS detected: check wiring."

Projects Programming
1 
#include <TinyGPSPlus.h>
#include <SoftwareSerial.h>
/*
   This sample sketch demonstrates the normal use of a TinyGPSPlus (TinyGPSPlus) object.
   It requires the use of SoftwareSerial, and assumes that you have a
   4800-baud serial GPS device hooked up on pins 4(rx) and 3(tx).
 */
static const int RXPin = 4, TXPin = 3;
static const uint32_t GPSBaud = 4800;

// The TinyGPSPlus object
TinyGPSPlus gps;

// The serial connection to the GPS device
SoftwareSerial ss(RXPin, TXPin);

void setup() {
	Serial.begin(115200);
	ss.begin(GPSBaud);

	Serial.println(F("DeviceExample.ino"));
	Serial.println(F("A simple demonstration of TinyGPSPlus with an attached GPS module"));
	Serial.print(F("Testing TinyGPSPlus library v. ")); Serial.println(TinyGPSPlus::libraryVersion());
	Serial.println(F("by Mikal Hart"));
	Serial.println();
}

void loop() {
	// This sketch displays information every time a new sentence is correctly encoded.
	while (ss.available() > 0) {
		if (gps.encode(ss.read())) {
			displayInfo();
		}
	}

	if (millis() > 5000 && gps.charsProcessed() < 10) {
		Serial.println(F("No GPS detected: check wiring."));
		while(true);
	}
}

void displayInfo() {
	Serial.print(F("Location: ")); 
	if (gps.location.isValid()) {
		Serial.print(gps.location.lat(), 6);
		Serial.print(F(","));
		Serial.print(gps.location.lng(), 6);
	} else {
		Serial.print(F("INVALID"));
	}

	Serial.print(F("  Date/Time: "));
	if (gps.date.isValid()) {
		Serial.print(gps.date.month());
		Serial.print(F("/"));
		Serial.print(gps.date.day());
		Serial.print(F("/"));
		Serial.print(gps.date.year());
	} else {
		Serial.print(F("INVALID"));
	}

	Serial.print(F(" "));
	if (gps.time.isValid()) {
		if (gps.time.hour() < 10) Serial.print(F("0"));
		Serial.print(gps.time.hour());
		Serial.print(F(":"));
		if (gps.time.minute() < 10) Serial.print(F("0"));
		Serial.print(gps.time.minute());
		Serial.print(F(":"));
		if (gps.time.second() < 10) Serial.print(F("0"));
		Serial.print(gps.time.second());
		Serial.print(F("."));
		if (gps.time.centisecond() < 10) Serial.print(F("0"));
		Serial.print(gps.time.centisecond());
	} else {
		Serial.print(F("INVALID"));
	}

	Serial.println();
}

wiring diagram:

image
image1029×715 63 KB

2

Have you tried other line speeds, like 9600?

3

Does the GPS antenna see satellites or only the ceiling of the room?

4

Agree with the comment on the baud rate, most all Ublox GPSs these days come set to 9600 baud.

5

Yes, it does I placed it outside

6

Changed the baud rate to 9600 its still the same

7

Try this program, it will print to the serial monitor all the characters coming from the GPS.

#define RXpin 4              //this is the pin that the Arduino will use to receive data from the GPS
#define TXpin 3              //this is the pin that the Arduino can use to send data (commands) to the GPS - not used

#include <SoftwareSerial.h>
SoftwareSerial GPS(RXpin, TXpin);

void loop()
{
  while (GPS.available())
  {
    Serial.write(GPS.read());
  }
}

void setup()
{
  GPS.begin(9600);
  Serial.begin(115200);
  Serial.println("GPS_Echo Starting");
}
8

According to your schematic you are using pins D4 and D5 to connect the GPS module.
The code is using pins D3 and D4.

If the schematic is correct, then you need to alter the sketch to suit.

The TX pin of the GPS module needs to the RX pin of the Arduino, and vice versa.

Also the default Baud rate of the NEO-7M is usually 9600, not 4800.

Try:

static const int RXPin = 5, TXPin = 4;

and:

static const uint32_t GPSBaud = 9600;
9

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