Ultrasonic, GPS and motor driver feasibility

Projects Programming
1

Hi everyone, i'm relatively new to Arduino and electronics in general. I am currently trying to use an Arduino Uno, a HC-SR04 ultrasonic sensor, a UBLOX 6M GPS and a L298N Dual Motor Controller in a school project.

I currently have all components functioning correctly giving serial monitor readings when my components are independent of each other. However, when I attempt to combine the code of these three components with each other i'm getting numerous errors. I've checked my wiring, all of my electronics are receiving 5 volts i've checked that the wiring is completely correct several times and I've changed around the code slightly to remove lines that I don't think were required.

I've tried to upload my code but when I do so I receive several errors that I don't really know the meaning of.

I have attached all my code below, as well as the errors that I received while attempting to upload. If anyone needs more info on my project i'm more than willing to share it.

Thanks in advance!

Ultrasonic:

/* Ultrasonic Sensor
 * VCC to 5V
 * GND to GND
 * TRIG to 11
 * ECHO to 4
 */

const int trigPin = 11;
const int echoPin = 4;

void setup() {
  Serial.begin(9600);
}

void loop()
{
  long duration, inches, cm;

  pinMode(trigPin, OUTPUT);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
  
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);
  
  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  
  delay(100);
}

long microsecondsToInches(long microseconds)
{
  return microseconds / 74 / 2;
}

long microsecondsToCentimeters(long microseconds)
{
  return microseconds / 29 / 2;
}

GPS:

/* GND to GND
 * VCC to 5V
 * RXD to 3
 * TXD to 2
 */

#include <TinyGPS++.h>

#include <SoftwareSerial.h>
#include "TinyGPS++.h"

int fixed = 0;
int led = 13;
TinyGPSPlus gps;
SoftwareSerial SoftSerial(2, 3);

void setup()
{
  pinMode(led, OUTPUT);
  SoftSerial.begin(9600);
  Serial.begin(9600);
  
}

void loop()
{

  while (SoftSerial.available() > 0)
    gps.encode(SoftSerial.read());

  if (gps.location.isUpdated())
  {
    fixed = 1;
    Serial.print("LAT="); Serial.print(gps.location.lat(), 6);
    Serial.print("LNG="); Serial.println(gps.location.lng(), 6);
  }

  if (fixed == 0)
  {
    digitalWrite(led, HIGH);
    delay(300);
    digitalWrite(led, LOW);
    delay(300);
  }
  if (gps.altitude.isUpdated())
  {
    Serial.print("Altitude:");
    Serial.println(gps.altitude.meters());
  }
}

Motor Driver:

// connect motor controller pins to Arduino digital pins
// motor one
int enA = 10;
int in1 = 9;
int in2 = 8;
// motor two
int enB = 5;
int in3 = 7;
int in4 = 6;
void setup()
{
pinMode(enA, OUTPUT);
pinMode(enB, OUTPUT);
pinMode(in1, OUTPUT);
pinMode(in2, OUTPUT);
pinMode(in3, OUTPUT);
pinMode(in4, OUTPUT);
}
void demoOne()
{
digitalWrite(in1, HIGH);
digitalWrite(in2, LOW);
analogWrite(enA, 200);
digitalWrite(in3, HIGH);
digitalWrite(in4, LOW);
analogWrite(enB, 200);

delay(2000);

digitalWrite(in1, LOW);
digitalWrite(in2, HIGH);
digitalWrite(in3, LOW);
digitalWrite(in4, HIGH);

delay(2000);

digitalWrite(in1, LOW);
digitalWrite(in2, LOW);
digitalWrite(in3, LOW);
digitalWrite(in4, LOW);
}
void demoTwo()
{
digitalWrite(in1, LOW);
digitalWrite(in2, HIGH);
digitalWrite(in3, LOW);
digitalWrite(in4, HIGH);
for (int i = 0; i < 256; i++)
{
analogWrite(enA, i);
analogWrite(enB, i);
delay(20);
}
for (int i = 255; i >= 0; --i)
{
analogWrite(enA, i);
analogWrite(enB, i);
delay(20);
}
digitalWrite(in1, LOW);
digitalWrite(in2, LOW);
digitalWrite(in3, LOW);
digitalWrite(in4, LOW);
}
void loop()
{
demoOne();
delay(1000);
demoTwo();
delay(1000);
}

Combined Code:

/* Alfred Code
   --- Ultrasonic ---
  * VCC to 5V
  * GND to GND
  * TRIG to 11
  * ECHO to 4
   --- GPS ---
  * VCC to 5V
  * GND to GND
  * RXD to 3
  * TXD to 2
   --- Motor Driver ---
  * enA to 10;
  * in1 to 9;
  * in2 to 8;
  * enB to 5;
  * in3 to 7;
  * in4 to 6;
 */

  // GPS

#include <TinyGPS++.h>

#include <SoftwareSerial.h>
#include "TinyGPS++.h"

int fixed = 0;
int led = 13;
TinyGPSPlus gps;
SoftwareSerial SoftSerial(2, 3);

  // Ultrasonic

const int trigPin = 11;
const int echoPin = 4;

  // Motor Driver

  // motor one
int enA = 10;
int in1 = 9;
int in2 = 8;
  // motor two
int enB = 5;
int in3 = 7;
int in4 = 6;

void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  SoftSerial.begin(9600);
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);
}
  void demoOne()
{
  digitalWrite(in1, HIGH);
  digitalWrite(in2, LOW);
  analogWrite(enA, 200);
  digitalWrite(in3, HIGH);
  digitalWrite(in4, LOW);
  analogWrite(enB, 200);

  delay(2000);

  digitalWrite(in1, LOW);
  digitalWrite(in2, HIGH);
  digitalWrite(in3, LOW);
  digitalWrite(in4, HIGH);

  delay(2000);

  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);
}
  void demoTwo()
{
  digitalWrite(in1, LOW);
  digitalWrite(in2, HIGH);
  digitalWrite(in3, LOW);
  digitalWrite(in4, HIGH);
  for (int i = 0; i < 256; i++)
{
  analogWrite(enA, i);
  analogWrite(enB, i);
  delay(20);
}
  for (int i = 255; i >= 0; --i)
{
  analogWrite(enA, i);
  analogWrite(enB, i);
  delay(20);
}
  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);
}

void loop()
{
  long duration, inches, cm;

  pinMode(trigPin, OUTPUT);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
  
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);
  
  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  
  delay(100);

long microsecondsToInches(long microseconds)
{
  return microseconds / 74 / 2;
}

long microsecondsToCentimeters(long microseconds)
{
  return microseconds / 29 / 2;
}

  while (SoftSerial.available() > 0)
    gps.encode(SoftSerial.read());

  if (gps.location.isUpdated())
  {
    fixed = 1;
    Serial.print("LAT="); Serial.print(gps.location.lat(), 6);
    Serial.print("LNG="); Serial.println(gps.location.lng(), 6);
  }

  if (fixed == 0)
  {
    digitalWrite(led, HIGH);
    delay(300);
    digitalWrite(led, LOW);
    delay(300);
  }
  if (gps.altitude.isUpdated())
  {
    Serial.print("Altitude:");
    Serial.println(gps.altitude.meters());
  }
  demoOne();
  delay(1000);
  demoTwo();
  delay(1000);

Errors:

Arduino: 1.8.3 (Mac OS X), Board: "Arduino/Genuino Uno"

In function 'void loop()':
Alfred_Final:121: error: 'microsecondsToInches' was not declared in this scope
   inches = microsecondsToInches(duration);
                                         ^
Alfred_Final:122: error: 'microsecondsToCentimeters' was not declared in this scope
   cm = microsecondsToCentimeters(duration);
                                          ^
Alfred_Final:133: error: a function-definition is not allowed here before '{' token
 {
 ^
Alfred_Final:138: error: a function-definition is not allowed here before '{' token
 {
 ^
Alfred_Final:167: error: expected '}' at end of input
   delay(1000);
              ^
exit status 1
'microsecondsToInches' was not declared in this scope
2 
  Serial.println();
 
  delay(100);

long microsecondsToInches(long microseconds)
{

You can't define a function, microsecondsToInches(), inside another function, loop().

3

PaulS:

  Serial.println();

delay(100);

long microsecondsToInches(long microseconds)
{



You can't define a function, microsecondsToInches(), inside another function, loop().

Ok, what should I do if I wanted to get this code to work?

4

Ok, what should I do if I wanted to get this code to work?

Recognize where the loop() function starts and ends, and move the two functions you are trying to define in loop() after the end of loop(). (Like they were in the working Ultrasonic code.)