Pls help Compilation error: 'myStepper' was not declared in this scope

Projects Programming
1

Can anyone pls help in using stepper.h and its included pls help me.

2

Best you read the intro on how to post here.
Bare minimum would be a copy of your code ( in code brackets as required) and a circuit diagram of what you have in front of you. (Not Fritzing)

Anything less becomes" I have a car and it's broken...what's wrong with it?"

3

oh. ok ty blue jets

4

Code:

#include <Servo.h>
#include <Stepper.h>

Servo myservo;  // create servo object to control a servo

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin
int Forward;

const int trigPin = 5;
const int echoPin = 6;
const int SW_pin = 2; // digital pin connected to switch output
const int X_pin = A0; // analog pin connected to X output
const int Y_pin = A1; // analog pin connected to Y output
const int stepsPerRevolution = 2048;  // change this to fit the number of steps per revolution
const int rolePerMinute = 15;         // Adjustable range of 28BYJ-48 stepper is 0~17 rpm


float duration, distance;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(11, OUTPUT);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(SW_pin, INPUT);
  digitalWrite(SW_pin, HIGH);
  Stepper.setSpeed(rolePerMinute)
  // initialize the serial port:
  Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Servo
  //val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  //val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  val = (val + 2);
  myservo.write(val);                  // sets the servo position according to the scaled value
  if (val > 175) {
    val = -40;
  }
  //Path Finding Here
  if (distance > 23) {
    Forward = 'true';
  }
  else if (distance < 23) {
    Forward = 'false';
  }
  else {
    Serial.print('ERROR');
  }
  // JoyStick
  int X = A1;
  int Y = A2;
  duration = pulseIn(echoPin, HIGH);
  distance = (duration*.0343)/2;
  Serial.print("Switch:  ");
  Serial.print(digitalRead(SW_pin));
  Serial.print("   ");
  Serial.print("X-axis: ");
  Serial.print(analogRead(X_pin));
  Serial.print("   ");
  Serial.print("Y-axis: ");
  Serial.println(analogRead(Y_pin));

  Serial.print("Distance: ");
  Serial.println(distance);
  Serial.print("Motor:");
  Serial.print(val);
  Serial.print("   ");
  //Path Finding
  if (Forward = 'true') {
  }
  else if (Forward = 'false') {
  }
  delay(20);
}

Try to egnore the other stuff :slight_smile:

6

Should be global ‘scope’, not local within setup()

7

ok ill try that ty

8

it works!!! tysm!!!!!!!

9

You will also have to fix some of those warnings:

/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:50:15: warning: character constant too long for its type
     Forward = 'true';
               ^~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:53:15: warning: character constant too long for its type
     Forward = 'false';
               ^~~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:56:18: warning: character constant too long for its type
     Serial.print('ERROR');
                  ^~~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:78:17: warning: character constant too long for its type
   if (Forward = 'true') {
                 ^~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:80:22: warning: character constant too long for its type
   else if (Forward = 'false') {
                      ^~~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino: In function 'void setup()':
sketch_jun09a:28:10: error: expected unqualified-id before '.' token
   Stepper.setSpeed(rolePerMinute)
          ^
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino: In function 'void loop()':
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:78:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if (Forward = 'true') {
       ~~~~~~~~^~~~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:80:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   else if (Forward = 'false') {
            ~~~~~~~~^~~~~~~~~
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:59:7: warning: unused variable 'X' [-Wunused-variable]
   int X = A1;
       ^
/tmp/arduino_modified_sketch_739258/sketch_jun09a.ino:60:7: warning: unused variable 'Y' [-Wunused-variable]
   int Y = A2;
       ^

     Forward = 'true';

Forward is an int, you can't assign some form of text to it, only one character. Make forward a bool variable and assign true or false to it.

if (Forward = 'true') {

Single = for assigment, double == for compare.

I suggest that you set Compiler warnings to all in File/Preferences.

10

ok ty

11

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