Multiple PIR Sensors

Projects Programming
1

I am working on a project based on the code from this site: How to use Pyroelectric ("Passive") Infrared Sensors (PIR)

I'm working with 2 PIR sensors and I can't figure out how to get a message to appear when one sensor is triggered shortly after the other. Here are the three conditions I need fulfilled:
Condition 1. Sensor 1 is triggered, message1 is displayed (DONE)
Condition 2. Sensor 2 is triggered, message2 is displayed (DONE)
Condition 3. Sensor 1 is triggered then Sensor 2 is triggered within a couple seconds, message3 is displayed

/*
 * PIR sensor tester
 */
 
int ledPin = 13;                // choose the pin for the LED
int inputPinSensor1 = 2;        // choose the input pin (for PIR sensor)
int inputPinSensor2 = 9;        // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int valSensor1 = 0;             // variable for reading the pin status (sensor 1)
int valSensor2 = 0;             // variable for reading the pin status (sensor 2)
 
void setup() {
  pinMode(ledPin, OUTPUT);             // declare LED as output
  pinMode(inputPinSensor1, INPUT);     // declare sensor as input
  pinMode(inputPinSensor2, INPUT);     // declare sensor as input
 
  Serial.begin(9600);
}
 
void loop(){
  valSensor1 = digitalRead(inputPinSensor1);  // read input value
  valSensor2 = digitalRead(inputPinSensor2);  // read input value
  
  // SENSOR 1
  if (valSensor1 == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);        // turn LED ON
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected! (message 1)");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW);         // turn LED OFF
    if (pirState == HIGH){
      // we have just turned of
      Serial.println("Motion ended! (message 1)");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
  
  // SENSOR 2
  if (valSensor2 == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);        // turn LED ON
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected! (message 2)");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW);         // turn LED OFF
    if (pirState == HIGH){
      // we have just turned of
      Serial.println("Motion ended! (message 2)");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}

I appreciate any help you can offer. Thanks for your time.

2

Note the time ( millis()) you detected the first event, and again when you detect the second.
The difference will tell you the delay between the two events.

3

Thanks for taking a look AWOL. My question is more about how I would code the third condition to display a third message.

So if sensor 1 is triggered and sensor 2 is NOT triggered within a couple seconds, the normal message 1 would appear. But, if sensor 1 is triggered AND sensor 2 is triggered within a couple seconds, then message 3 would appear.