NOTE: Copying source code from a web page often causes problems because the web page is usually aiming for beauty rather than accuracy. Always look for a 'raw' or 'download' option for the source code.
I think in your case the web page decided that two dashes together ("--") was a way of saying "long dash" so it made the substitution. That breaks the source code.
At the bottom of the box displaying the source code is a link named "view raw". Click on that to get the raw source code. Then copy and paste the source code to the Arduino IDE.
Note: Even though it does not show up on the "view raw" page, Select All, Cut, and Paste causes this line to show up at the bottom of the sketch:
{"mode":"full","isActive":false}
I don't know where it comes from but you will have to delete it from the sketch to get it to compile.
/*
Tutorial: Control Stepper Motor With Blynk App Using ESP32
Board:
- TTGO T-Display ESP32
Output:
- 12V 28BYJ-48 Stepper Motor
https://my.cytron.io/c-motor-and-motor-driver/c-dc-motor/c-stepper-motor/p-12v-28byj-48-stepper-motor-plus-uln2003-driver-board
Library Manager:
- TFT_eSPI by Bodmer Version 1.4.20
- Blynk by Volodymyr Shymanskyy Version 0.6.1
*/
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
const char ssid[] = "Your WiFi SSID"; // WiFi name
const char password[] = "Your WiFi Password"; // WiFi password
#include <BlynkSimpleEsp32.h>
char auth[] = "Your Blynk Auth Token"; // Blynk Authentication Token
WiFiServer server(80);
#include <SPI.h>
#include <TFT_eSPI.h>
TFT_eSPI tft = TFT_eSPI(); // Resolution 135 x 240
#define FF17 &FreeSans9pt7b
#define FF21 &FreeSansBold9pt7b
#define ROW1 0,16
#define ROW2 0,38
#define ROW3 0,60
#define ROW4 0,82
#define ROW5 0,104
#define ROW6 0,126
#define BUTTON1 35
#define BUTTON2 0
#define STEPPER_IN1 27
#define STEPPER_IN2 26
#define STEPPER_IN3 25
#define STEPPER_IN4 33
#define REVOLUTION_STEP 2048 // 1 revolution
boolean stepperDirection = false;
int stepperStep = 0;
int stepperStepCount = 0;
boolean stepperMove = false;
long prevMillisStepper = 0;
int intervalStepper = 4; // Minimum is 2
boolean button1Pressed = false;
boolean button2Pressed = false;
BLYNK_WRITE(V0) // Button Widget is writing to pin V0
{
stepperDirection = param.asInt();
tft.fillRect(120, 65, 120, 25, TFT_BLACK);
tft.setCursor(120, 82);
if (stepperDirection) {
tft.print("CCW");
}
else {
tft.print("CW");
}
}
BLYNK_WRITE(V1) // Button Widget is writing to pin V1
{
int stepperSpeed = param.asInt();
tft.fillRect(120, 87, 120, 25, TFT_BLACK);
tft.setCursor(120, 104);
if (stepperSpeed == 1) {
intervalStepper = 4;
tft.print("Low");
}
else if (stepperSpeed == 2) {
intervalStepper = 3;
tft.print("Medium");
}
else if (stepperSpeed == 3) {
intervalStepper = 2;
tft.print("High");
}
}
BLYNK_WRITE(V2) // Button Widget is writing to pin V2
{
stepperMove = true;
stepperStepCount = 0;
stepperStep = 1;
tft.fillRect(120, 109, 120, 25, TFT_BLACK);
tft.setCursor(120, 126);
tft.print("Run");
}
void setup()
{
pinMode(BUTTON1, INPUT_PULLUP);
pinMode(BUTTON2, INPUT_PULLUP);
pinMode(STEPPER_IN1, OUTPUT);
pinMode(STEPPER_IN2, OUTPUT);
pinMode(STEPPER_IN3, OUTPUT);
pinMode(STEPPER_IN4, OUTPUT);
Serial.begin(115200);
Serial.print("Initialize Blynk.");
tft.init();
tft.setRotation(3);
tft.fillScreen(TFT_BLACK);
tft.setFreeFont(FF21);
tft.setTextColor(TFT_BLUE);
tft.setCursor(ROW1);
tft.print("Blynk Status:");
tft.setFreeFont(FF17);
tft.setTextColor(TFT_WHITE);
tft.setCursor(120, 16);
tft.print("Initialize...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Blynk.begin(auth, ssid, password);
tft.fillRect(120, 0, 120, 35, TFT_BLACK);
tft.setCursor(120, 16);
tft.print("Ready!");
tft.setFreeFont(FF21);
tft.setTextColor(TFT_RED);
tft.setCursor(ROW3);
tft.print("STEPPER");
tft.setTextColor(TFT_GREEN);
tft.setCursor(ROW4);
tft.print("Direction:");
tft.setCursor(ROW5);
tft.print("Speed:");
tft.setCursor(ROW6);
tft.print("Status:");
tft.setFreeFont(FF17);
tft.setTextColor(TFT_YELLOW);
tft.setCursor(120, 82);
tft.print("CW");
tft.setCursor(120, 104);
tft.print("Low");
tft.setCursor(120, 126);
tft.print("Stop");
Blynk.virtualWrite(0, 0);
Blynk.virtualWrite(1, 1);
Blynk.virtualWrite(2, 0);
}
void loop()
{
Blynk.run();
if (digitalRead(BUTTON1) == LOW &&
button1Pressed == false) {
button1Pressed = true;
stepperDirection = false;
stepperMove = true;
stepperStepCount = 0;
stepperStep = 1;
}
else if (digitalRead(BUTTON1) == HIGH &&
button1Pressed == true) {
button1Pressed = false;
}
if (digitalRead(BUTTON2) == LOW) {
stepperDirection = true;
stepperMove = true;
stepperStepCount = 0;
stepperStep = 1;
}
else if (digitalRead(BUTTON2) == HIGH &&
button2Pressed == true) {
button2Pressed = false;
}
if (millis() - prevMillisStepper > intervalStepper) {
if (stepperMove == true) {
if (stepperDirection) {
if (stepperStep++ >= 3) {
stepperStep = 0;
}
}
else {
if (stepperStep-- == 0) {
stepperStep = 3;
}
}
if (stepperStepCount++ == REVOLUTION_STEP) {
stepperMove = false;
stepperStep = 4;
Blynk.virtualWrite(2, 0);
tft.fillRect(120, 109, 120, 25, TFT_BLACK);
tft.setCursor(120, 126);
tft.print("Stop");
}
switch (stepperStep) {
case 0:
digitalWrite(STEPPER_IN1, HIGH);
digitalWrite(STEPPER_IN2, LOW);
digitalWrite(STEPPER_IN3, LOW);
digitalWrite(STEPPER_IN4, LOW);
break;
case 1:
digitalWrite(STEPPER_IN1, LOW);
digitalWrite(STEPPER_IN2, HIGH);
digitalWrite(STEPPER_IN3, LOW);
digitalWrite(STEPPER_IN4, LOW);
break;
case 2:
digitalWrite(STEPPER_IN1, LOW);
digitalWrite(STEPPER_IN2, LOW);
digitalWrite(STEPPER_IN3, HIGH);
digitalWrite(STEPPER_IN4, LOW);
break;
case 3:
digitalWrite(STEPPER_IN1, LOW);
digitalWrite(STEPPER_IN2, LOW);
digitalWrite(STEPPER_IN3, LOW);
digitalWrite(STEPPER_IN4, HIGH);
break;
default:
digitalWrite(STEPPER_IN1, LOW);
digitalWrite(STEPPER_IN2, LOW);
digitalWrite(STEPPER_IN3, LOW);
digitalWrite(STEPPER_IN4, LOW);
break;
}
}
prevMillisStepper = millis();
}
}