stairleds_16xrelay.c

/**
 * ---------------------------------------------------------
 * | Esp-32/Arduino Stair Led Relay control                |
 * | By SchizoDuckie, ©2019                                |
 * |                                                       |
 * | Disclaimer:                                           |
 * | I am in no way, shape or form responsible for         | 
 * | - You setting your house on fire                      |
 * | - Your firstborn suddenly getting autism              |
 * | - Your girlfriend running off with the neighbour      |
 * | - Your mom's failure to love you                      |
 * | - Or any other side effect running this code may have | 
 * |                                                       |
 * ---------------------------------------------------------
 */


/**
 * These are the individual stair tred definitions.
 * Meaning the relay that's connected to a specific step on the stairs is connected to this digital output pin.
 * They are not used in code but you'll thank yourself for documenting them for future use.  
 */ 
int STEP_1 = 0; // step 1 counting from the ground floor is connected to pin 0 on the ESP-32
int STEP_2 = 13; // and so on
int STEP_3 = 14;
int STEP_4 = 15;
int STEP_5 = 16;
int STEP_6 = 17;
int STEP_7 = 18;
int STEP_8 = 19;
int STEP_9 = 21;
int STEP_10 = 22;
int STEP_11 = 23;
int STEP_12 = 32;
int STEP_13 = 26;
int STEP_14 = 27;
int STEP_15 = 33;
int STEP_16 = 25;

/**
 * PIR sensors are connected to digital input capable pins.
 */
int PIR_SENSOR_1 = 5;
int PIR_SENSOR_2 = 4;

/**
 * This is the array of step pins that we can easily iterate over. 
 * Basically the values above but in a nice collection.
 */
int step_pins[16] = {0, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 32, 26, 27, 33, 25};


/**
 * Predefined delay constants in milliseconds.
 * TRED_DELAY is the delay before the next tred goes on or off
 * WALKING_DELAY is the amount of time it takes you on average to walk up the stairs
 * RESET_DELAY is the hardwired delay the PIR sensor needs before it starts looking for new movement
 */
int TRED_DELAY = 200;
int WALKING_DELAY = 8000; 
int RESET_DELAY = 8000;


/**
 * Initialize the code:
 * - Open the serial connection (for logging to serial monitor)
 * - Set the mode on all the step_pins to OUTPUT, so we can control the relay
 * - Set the value to HIGH for all the relays, so they're turned OFF.
 * - Wait for the PIR sensors to initialize
 * - Set the pinmode on PIR sensor pins to INPUT so we can read it's values.
 */
void setup()
{
  Serial.begin(19200);

  for (byte i = 0; i < 16; i++) {
    pinMode(step_pins[i], OUTPUT);
    digitalWrite(step_pins[i], true);
  }
  delay(RESET_DELAY);
  pinMode(PIR_SENSOR_1, INPUT);
  pinMode(PIR_SENSOR_2, INPUT);
}

/**
 * The loop executes the business end of the code on every clock step
 * - Prints the raw sensor states for debugging
 * - Checks if a PIR_SENSOR_1 was triggered
 * - If so: 
 *   - iterates over all the pins in step_pins and turns the relay connected to it ON, waiting TRED_DELAY after each switch
 *   - Waits for WALKING_DELAY before turning them off again
 *   - Iterates over all the pins in the same order and turns the relay OFF
 *   - Waits for RESET_DELAY to allow the PIR sensor to reset
 * - Otherwise:
 *   - iterates over all the pins in step_pins in reverse order and turns the relay connected to it ON, waiting TRED_DELAY after each switch
 *   - Waits for WALKING_DELAY before turning them off again
 *   - Iterates over all the pins in the same reverse order and turns the relay OFF
 *   - Waits for RESET_DELAY to allow the PIR sensor to reset
 * If nothing happened the check repeats.
 */
void loop()
{
  printf("Sensor states: %d, %d\n", digitalRead(PIR_SENSOR_1), digitalRead(PIR_SENSOR_2));
    
  if (digitalRead(PIR_SENSOR_1) == HIGH) { // the PIR sensor will put 5 volts on the signal port when it detects movement.
    Serial.println("PIR_SENSOR_1 detected movement!"); // log it to the console
    for (byte i = 0; i < 16; i++) { // iterate over all the relays
      digitalWrite(step_pins[i], false); // and turn them on
      delay(TRED_DELAY); // with TRED_DELAY pause in between.
    }
    delay(WALKING_DELAY); // allow time to pass moving down the stairs
    for (byte j = 0; j < 16; j++) { // iterate over all the relays
      digitalWrite(step_pins[j], true); // and turn them off
      delay(TRED_DELAY); // with TRED_DELAY pause in between.
    }
    
    delay(RESET_DELAY); // PIR sensor won't give a new signal until RESET_DELAY ms passed.
  } else if (digitalRead(PIR_SENSOR_2) == HIGH) {
    Serial.println("PIR_SENSOR_2 detected movement!!");
    prevState = true;
    for (byte k = 0; k < 16; k++) { // iterate over all the relays in reverse order
      digitalWrite(step_pins[15 - k], false);
      delay(TRED_DELAY);
    }
    delay(WALKING_DELAY); 
    for (byte l = 0; l < 16; l++) {
      digitalWrite(step_pins[15 - l], true);
      delay(TRED_DELAY);
    }
    delay(RESET_DELAY); 
  }
}

Nice project! Why are you using relays? Maybe you could make the "animation" smoother by using a WS2801 ledstrip and just a 5v adaptor? The advantage is that you can fade them and you can even make every rgb color. Maybe that is a nice improvement. I have written a library for the basic things, I could share it with you.

And since you are using an ESP32, if you really like programming, you can make a website to control/configure the leds.

Heheheh This was just V1.
The new version controls PCA9685's via PWM, but I rewrote the whole thing in javascript
https://imgur.com/gallery/LoaoaRp

Ah I see, I was thinking about PWM too, but I don't think that can be used with mechanical relays. It looks better now! Maybe for other projects, look at strips like the WS2801. Not that I am sponsored or something, but I think they are great for projects like this. And the only hardware they need is a power supply and, for example, an ESP.

Yeah I have kind of strong feelings against RGB everything. You'll only find warm and cold light in my house. But i do like the tech!

Hy Schizo can you help me?
When I trai to upload the cod a have an error "preState "was not declare în this scope.
Thank you and good luck!