DEV Community: Denys Shabelnyk

Replace delay()

Denys Shabelnyk — Wed, 06 Aug 2025 18:30:56 +0000

Hi, guys!
Following one of Arduino course on Udemy platform I found very useful, in my opinion, advice how to avoid using delay() function, because it is not good (I am beginner in Arduino world). The lector suggest to use two variables with millis() function as start mark and current time inside loop() function. Code example is below:

I can trust in code above and believe that I have real 500 ms between part of my programm.

Are you agree ?
Happy coding!

Best regards, Denys

Time functions in Arduino Uno

Denys Shabelnyk — Wed, 30 Jul 2025 18:31:02 +0000

Arduino Uno has minimum two functions which help to get current time mark from the beginning: millis() and micros().
millis() returns time marks in milliseconds.
micros() returns time marks in microseconds.
These two functions can be very useful if you work with sensors.
And, do not forget to save output on a variable with type unsigned long
Happy coding!

trap for beginners in C++

Denys Shabelnyk — Thu, 24 Jul 2025 18:53:27 +0000

Following one of C++ course I found one interesting example how to correctly use combination std::cin together with std::getline().
Look at firts example below:

What do you think the output will be ?
Your age is
Your name is
but not. Output is below:

To avoid this strange behaviour always use std::cin.get() before std::cin and std::getline() like on the code snippet below:

Now you will get correct output.

Be careful and happy coding!

Arduino library has few delay function: 1. delay() - as a parameter you should pass a value on milliseconds; 2. delayMicroseconds() - as a parameter you should pass a value on microseconds. I see that really first time.

Denys Shabelnyk — Wed, 23 Jul 2025 19:59:40 +0000

LED frequency manipulation via COM port

Denys Shabelnyk — Wed, 23 Jul 2025 19:48:42 +0000

`#define LED_PIN 12

int blinkDelay = 500;
int LEDState = LOW;

void setup() {
Serial.begin(9600);
Serial.setTimeout(10);

pinMode(LED_PIN,OUTPUT);
}

void loop() {

if(Serial.available() > 0) {
int data = Serial.parseInt();
if ((data >= 100) && (data <= 1000)) {
blinkDelay = data;
}
}

if(LEDState == LOW) {
LEDState = HIGH;
} else {
LEDState = LOW;
}

digitalWrite(LED_PIN,LEDState);
delay(blinkDelay);
}`

#myArduino What baud rate is optimal for serial communication. The correct answer is 9600 or 115200

Denys Shabelnyk — Wed, 23 Jul 2025 19:10:04 +0000

@myArduino What baud rate is optimal for serial communication. The correct answer is 9600 or 115200

Denys Shabelnyk — Wed, 23 Jul 2025 19:08:34 +0000