Serial.print is not working on ESP32

Using Arduino Programming Questions
1

Hello everyone! I am trying to run a program that controls a DC motor. I've tried the program and the motor runs perfectly but the serial monitor is not showing anything as I intended, not even the "Start" in the void setup. Here is my code:

const int motorPin1 = 26;
const int motorPin2 = 27;
const int buzzerPin = 25;
int motorEn = 0;

void setup() {
  Serial.begin(9600);
  Serial.print("Start!");

  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(motorEn, OUTPUT);
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorEn, 0);
}

void loop() {
  unsigned long startTime = millis();
  float counter = 0.0;

  while (millis() - startTime < 6 * 60 * 60 * 1000) {
    digitalWrite(motorPin1, HIGH);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorEn, 255);

    counter += 4.3;

    delay(1 * 60 * 1000);

    digitalWrite(motorPin1, LOW);
    digitalWrite(motorPin2, LOW);
    digitalWrite(motorEn, 0);

    delay(3 * 60 * 1000 + 11 * 1000);

    Serial.println(counter);
  }
}

Is there anything wrong with it?

Thank you in advance for your responses!

2

Is SerialMonitor set to 9600 too ?

I've got in the habit of adding a delay:

Serial.begin(9600);
delay(2000);
Serial.println("Ready!");
3

Hello, thank you for your response. Adding a delay did work but how about printing the counter? it still didn't work

4

That's a long time, isn't it?

5

Did you want:

static float counter = 0.0;

6

And you're mixing delay() and millis() - that makes everything weird.

7

Yeah, I've monitored the serial for some time to see if it works and also tried changing it to a shorter time but the serial didn't print anything

8

Like I said, your mixing delay() and millis() makes everything weird.

9

You might want to print out how long that delay is, I'm not sure how the compiler behaves for the ESP32, usually for AVR processors the arithmetic is done as a 16-bit signed integer, but the delay() function takes an unsigned 32-bit integer as an argument. Try explicitly making the numbers unsigned long.

< edit > On an UNO, that equation gives a delay of 4294961688mS.

10

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