PIR, relay, mills project help

Using Arduino Project Guidance
1

I am trying to setup a fun Halloween project building a coffin with a hinged lid and sound using relays to control motors and mp3 board to activate sound using NANO every board(thought was a classic but it installed every when I plugged it in)

Starting off with just using PIR to activate relay(using leds as test) I program what I believe to be pir activates relay for specific time then waits to reactive that relay for another predetermined time using mills.,

I am having different results using different logic but posted is my basic. What happens is I can continuously trip the sensor causing led to light every time like it isn't using a delayed reactivation time.

#include <Arduino.h>

#define PIR_SENSOR_PIN 2
#define RELAY1_PIN 4

// Time in milliseconds
#define ACTIVATION_TIME 2000 
#define WAIT_TIME 120000 

unsigned long previousMillis = 0; 
bool motionDetected = false;

void setup() {
  pinMode(PIR_SENSOR_PIN, INPUT);
  pinMode(RELAY1_PIN, OUTPUT);
  digitalWrite(RELAY1_PIN, LOW);
}

void loop() {
  unsigned long currentMillis = millis();

  if (digitalRead(PIR_SENSOR_PIN) == HIGH) {
    motionDetected = true;
  }

  if (motionDetected) {
    digitalWrite(RELAY1_PIN, HIGH);
    if (currentMillis - previousMillis >= ACTIVATION_TIME) {
      digitalWrite(RELAY1_PIN, LOW);
      previousMillis = currentMillis;
      motionDetected = false;
    }
  }

  if (currentMillis - previousMillis >= WAIT_TIME) {
    previousMillis = currentMillis;
  }
}

My ultimate goal is to use the Nano, 2 relays, PIR sensor, mp3 playback. If sensor sees movement relay 1 (HIGH)activates for 30 seconds, mp3 (LOW) for 2 seconds, if sensor still detects motion after 35 seconds it actives relay 2 and mp3 2 for same intervals
Then waits till time of 10 minutes has passed to activate sensor again.

2

read about Finite-state machine coding. Tons of example for Arduino and it would be very suited to your project

3

maybe something like..

#include <Arduino.h>

#define PIR_SENSOR_PIN 2
#define RELAY1_PIN 4

// Time in milliseconds
#define ACTIVATION_TIME 2000
#define WAIT_TIME 120000

unsigned long previousMillis = 0;
bool motionDetected = false;
byte effectState = 0;

void setup() {
  Serial.begin(115200);
  pinMode(PIR_SENSOR_PIN, INPUT);
  pinMode(RELAY1_PIN, OUTPUT);
  digitalWrite(RELAY1_PIN, LOW);
}

void loop() {
  unsigned long currentMillis = millis();

  if (digitalRead(PIR_SENSOR_PIN) == HIGH) {
    if (!motionDetected) {
      motionDetected = true;
      effectState = 0;
    } else
      motionDetected = true;

  }
  if (motionDetected) {
    switch (effectState) {
      case 0: digitalWrite(RELAY1_PIN, HIGH);
        previousMillis = millis();
        effectState++;
        break;
      case 1: if (millis() - previousMillis >= ACTIVATION_TIME) {
          previousMillis = millis();
          effectState++;
          digitalWrite(RELAY1_PIN, LOW);
        }
        break;
      case 2: if (millis() - previousMillis >= WAIT_TIME) {
          previousMillis = millis();
          effectState++;
          motionDetected = false;
        }
        break;
    }
  }
}

Project simmed here..

have fun.. ~q

4

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