Police Siren

We have made a Police Siren that features a blinking red LED and blue LED and emits sound just like that of a police car.

We referenced "Police Siren Circuit Using 555 Timer IC" by vikkey321, but due to its mechanical nature, we could not utilize it to its fullest extent. However, another Instructable "How to Make a Siren Using Arduino" by Jigneshk5, proved to be more useful as it also utilized an Arduino.

https://www.instructables.com/How-to-Make-a-Siren-Using-Arduino/

https://www.instructables.com/Introduction-99/

Wires will be connected to Arduino to power the circuit and to transfer programmable instructions.

Add resistors in order to with hold energy from burning out the LED materials.

LEDs will be connected to flow of current for electricity and power them.

Sauntering the wires to the speaker so that the ends of both materials don't flare out.

Open ARDUINO and apply the code.

void setup() {

pinMode(0, OUTPUT); //This pin we use to control the speaker

pinMode(10, OUTPUT); // This pin is for one light while pin 11 s for the other

pinMode(11, OUTPUT);

}

void loop() {

digitalWrite(10, HIGH); //This makes the light attached to pin 10 turn on

digitalWrite(11, LOW); //This makes the light attached to pin 11 turn of

tone(0,1900,2000); //The first number is the pin second number is the tone that we found was the closest to what we want and the third number is duration

delay(1000);

digitalWrite(11, HIGH); //This makes the light attached to pin 11 turn on

digitalWrite(10, LOW); //This makes the light attached to pin 10 turn off

tone(0,1850,2000); // Same as before but a different tone to make the sound mimic an alarm

delay(1000);

}

This will give instructions to the circuit.

Press the button to take you to the passengers seat of that everyday emergency vehicle swiftly driving across the freeway.