usb_nabijecka.ino

#define USB1_SW  2
#define USB2_SW  3

#define USB1_HALL  8
#define USB2_HALL  9

unsigned long previousMillis = 0; 
const long interval = 500;

void setup() {
  pinMode(USB1_SW, OUTPUT);
  pinMode(USB2_SW, OUTPUT);
  pinMode(USB1_HALL, INPUT);
  pinMode(USB2_HALL, INPUT);  
  Serial.begin(9600);
}

bool tmp = false;

void loop() {
  int usb1_hall = analogRead(USB1_HALL);
  int usb2_hall = analogRead(USB2_HALL);
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    digitalWrite(USB1_SW, HIGH);
    digitalWrite(USB2_SW, LOW);
    
    Serial.print("usb1_hall = ");
    Serial.print(usb1_hall);
    Serial.print("   usb2_hall = ");
    Serial.print(usb2_hall);  
    Serial.println();
    
    tmp = !tmp;
  }
}

vystup.txt

usb1_hall = 3   usb2_hall = 2
usb1_hall = 0   usb2_hall = 0
usb1_hall = 0   usb2_hall = 0
usb1_hall = 0   usb2_hall = 0
usb1_hall = 0   usb2_hall = 0
usb1_hall = 1   usb2_hall = 1
usb1_hall = 5   usb2_hall = 5
usb1_hall = 2   usb2_hall = 2
usb1_hall = 6   usb2_hall = 5
usb1_hall = 9   usb2_hall = 9
usb1_hall = 7   usb2_hall = 7
usb1_hall = 10   usb2_hall = 10
usb1_hall = 14   usb2_hall = 13
usb1_hall = 18   usb2_hall = 17
usb1_hall = 16   usb2_hall = 15
usb1_hall = 18   usb2_hall = 17
usb1_hall = 21   usb2_hall = 20
usb1_hall = 19   usb2_hall = 19
usb1_hall = 22   usb2_hall = 21
usb1_hall = 23   usb2_hall = 23
usb1_hall = 25   usb2_hall = 24
usb1_hall = 24   usb2_hall = 23