millis example

unsigned long previousMillis1 = 0;
unsigned long previousMillis2 = 0;
const long interval1 = 1000;
const long interval2 = 500;

void loop() {
    unsigned long currentMillis = millis();

    if (currentMillis - previousMillis1 >= interval1) {
        previousMillis1 = currentMillis;
        // Task 1 code
    }

    if (currentMillis - previousMillis2 >= interval2) {
        previousMillis2 = currentMillis;
        // Task 2 code
    }
}