Police LEDs Arduino Nano 33 IoT

README.md

Police LED Demo

Hi- this is a quick script to control 2 LEDs with 2 Momentary Switches. It's a very simple script that switches between 4 unique states.

Schematic

policeLEDs.ino

//Michal Bodzianowski (2021)
//A simple demo that controls 2 LEDs with 2 Momentary Switches
//Name refers to the siren state and color of LEDs.

//GPIO pins of everything used.
//corresponds to Arduino Nano 33 IoT
int redSwitch = 12;
int blueLED = 10;
int whiteSwitch = 8;
int whiteLED = 6;

//Tracks the HIGH/LOW state of switches.
int redState = 0;
int whiteState =0;

void setup() 
{
  //Set up switches and LEDs as i/o accordingly
  pinMode(redSwitch, INPUT);
  pinMode(whiteSwitch, INPUT);
  pinMode(blueLED, OUTPUT);
  pinMode(whiteLED, OUTPUT);
}

void loop() 
{
  //Read in the state of switches
  redState = digitalRead(redSwitch);
  whiteState = digitalRead(whiteSwitch);

  //Siren state
  //Swap between white LED and blue LED
  //every 100ms if both switches pressed
  if(redState == HIGH && whiteState == HIGH)
  {
    digitalWrite(whiteLED, HIGH);
    digitalWrite(blueLED, LOW);
    delay(100);
    digitalWrite(whiteLED, LOW);
    digitalWrite(blueLED, HIGH);
    delay(100);
  }
  //Both state - turn both LEDs on if white switch pressed
  else if(whiteState == HIGH)
  {
    digitalWrite(whiteLED, HIGH);
    digitalWrite(blueLED, HIGH);
  }
  //White LED state - turn white LED on if red switch pressed
  else if(redState == HIGH)
  {
    digitalWrite(whiteLED, HIGH);
  }
  //No state- keep both off if nothing pressed.
  else
  {
    digitalWrite(whiteLED, LOW);
    digitalWrite(blueLED, LOW);
  } 
}