MPR121 Relays rev_02

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    - Project: MPR121 Relays
    - Source Code NOT compiled for: ESP32 DevKit V1
    - Source Code created on: 2025-09-04 18:20:10

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* clontrol 8 SSD relay with IR remote and MPR121 */
    /* touch pad */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Relay.h>  //https://github.com/rafaelnsantos/Relay
#include <Wire.h>
#include <Adafruit_MPR121.h>
#include <IRrecv.h>
#include <IRutils.h>

/****** CONSTANTS AND PIN DEFINITIONS *****/
#define NUM_RELAYS 8

// Relay pin mapping (ESP32 GPIOs). Ensure these pins are suitable for your board and relay driver wiring.
const uint8_t RELAY_PINS[NUM_RELAYS] = {
  2, 4, 5, 12, 13, 14, 15, 16
};

// I2C pins for MPR121
#define MPR_SDA_PIN 21
#define MPR_SCL_PIN 22

// IR receiver
#define IR_PIN 27

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

// MPR121 touch support
Adafruit_MPR121 cap = Adafruit_MPR121();

// IR receiver object
IRrecv irrecv(IR_PIN);
decode_results results;

// Relay modules (explicit pin mapping for clarity)
Relay relays[NUM_RELAYS] = {
  Relay(2, true),
  Relay(4, true),
  Relay(5, true),
  Relay(12, true),
  Relay(13, true),
  Relay(14, true),
  Relay(15, true),
  Relay(16, true)
};

// Previous touch states for MPR121 electrodes (we use first 8 electrodes)
bool prevTouch[NUM_RELAYS];

// Helper to toggle a relay state
void toggleRelay(uint8_t idx) {
  if (idx >= NUM_RELAYS) return;
  if (relays[idx].getState()) {
    relays[idx].turnOff();
  } else {
    relays[idx].turnOn();
  }
}

// Process IR remote codes (example mappings for common NEC-like remotes)
void processIR(uint32_t code) {
  switch (code) {
    case 0xFF30CF: toggleRelay(0); break; // Key 1
    case 0xFF18E7: toggleRelay(1); break; // Key 2
    case 0xFF7A85: toggleRelay(2); break; // Key 3
    case 0xFF10EF: toggleRelay(3); break; // Key 4
    case 0xFF38C7: toggleRelay(4); break; // Key 5
    case 0xFF5AA5: toggleRelay(5); break; // Key 6
    case 0xFF42BD: toggleRelay(6); break; // Key 7
    case 0xFF4AB5: toggleRelay(7); break; // Key 8
    default: break;
  }
}

void setup(void)
{
  // Initialize serial for debugging
  Serial.begin(115200);
  while (!Serial) { ; }

  // Initialize Relay modules and reset touch states
  for (uint8_t i = 0; i < NUM_RELAYS; i++) {
    relays[i].begin();
    prevTouch[i] = false;
  }

  // Initialize I2C for MPR121 on defined pins
  Wire.begin(MPR_SDA_PIN, MPR_SCL_PIN);
  if (!cap.begin(0x5A)) {
    Serial.println("MPR121 not found");
    while (1);
  }

  // Initialize IR receiver
  irrecv.enableIRIn();

  Serial.println("System ready");
}

void loop(void)
{
  // IR remote handling
  if (irrecv.decode(&results)) {
    processIR(results.value);
    irrecv.resume();
  }

  // MPR121 touch handling (toggle relays on touch edge)
  uint16_t touches = cap.touched();
  for (uint8_t i = 0; i < NUM_RELAYS; i++) {
    bool isTouched = (touches & (1 << i)) != 0;
    if (isTouched && !prevTouch[i]) {
      toggleRelay(i);
    }
    prevTouch[i] = isTouched;
  }

  delay(20);
}

/* END CODE */