Project 3 SOS Distress Device

1. Description

Arduino SOS device is able to emit distress signals, which coincides with the principle of Morse code. It is convenient for emergencies.

2. Wiring Diagram

3. Test Code

/*
  keyestudio ESP32 Inventor Learning Kit 
  Project 3：SOS Distress Device
  http://www.keyestudio.com
*/
int ledPin = 5;  //Define pin as IO5
 
void setup() 
{
	pinMode(ledPin, OUTPUT);
}
 
void loop() 
{
    //Three quickly blinks mean “S”
    for(int x=0;x<3;x++)
    {
        digitalWrite(ledPin,HIGH);            //Set LED to light up 
        delay(150);                           //Delay 150ms 
        digitalWrite(ledPin,LOW);             //Set LED to turn off 
        delay(100);                           //Delay 100ms 
	}
    delay(200);//delay 200ms to generate the space between letters
 
    //Three slowly blinks mean “O”
    for(int x=0;x<3;x++)
    {
        digitalWrite(ledPin,HIGH);            //Set LED to light up
        delay(400);                           //Delay 400ms
        digitalWrite(ledPin,LOW);             //Set LED to turn off
        delay(200);                           //Delay 200ms
    }
	delay(100);//Delay 100ms to generate the space between letters
 
    // Three quickly blinks mean “S”
    for(int x=0;x<3;x++)
    {
        digitalWrite(ledPin,HIGH);            //Set LED to light up
        delay(150);                           //Delay 150ms
        digitalWrite(ledPin,LOW);             //Set LED to turn off 
        delay(100);                           //Delay 100ms
    } 
	delay(5000);// Wait 5s before repeating S.0.S
}

4. Test Result

After the code is successfully uploaded, we can see that the LED flashes 3 times quickly, then flashes 3 times slowly and then flashes 3 times quickly, alternating between fast and slow.