first version

arduino_logic.ino

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+#include <Wire.h>
+#include <RTClib.h>
+#include <EEPROM.h>
+
+RTC_DS3231 rtc;
+
+const int buttonPins[] = {2, 3, 4, 5}; 
+const int ledPins[]    = {8, 9, 10, 11}; 
+const int ledMap[]     = {3, 1, 0, 2}; 
+const int resistorPin  = 6; // RESISTOR GOES HERE (Pin 6 to GND)
+
+bool ledState[] = {false, false, false, false};
+bool resetPerformed = false;
+unsigned long lastKeepAlive = 0;
+const int pulseDuration = 800;   // 0.2s is usually enough to reset the timer
+const int pulseInterval = 10000; // 20s interval (test if your power bank handles this)
+
+void setup() {
+  rtc.begin();
+  
+  // Ensure the resistor pin starts LOW (off)
+  pinMode(resistorPin, OUTPUT);
+  digitalWrite(resistorPin, LOW);
+  
+  // Disable the onboard LED explicitly
+  pinMode(13, OUTPUT);
+  digitalWrite(13, LOW);
+
+  for (int i = 0; i < 4; i++) {
+    pinMode(buttonPins[i], INPUT_PULLUP);
+    pinMode(ledPins[i], OUTPUT);
+    ledState[i] = EEPROM.read(i); 
+    digitalWrite(ledPins[i], ledState[i] ? HIGH : LOW);
+  }
+}
+
+void loop() {
+  DateTime now = rtc.now();
+  unsigned long currentMillis = millis();
+
+  // --- 1. SILENT KEEP-ALIVE (PIN 6 ONLY) ---
+  if (currentMillis - lastKeepAlive > pulseInterval) {
+    digitalWrite(resistorPin, HIGH); 
+
+    if (currentMillis - lastKeepAlive > (pulseInterval + pulseDuration)) {
+      digitalWrite(resistorPin, LOW); 
+      lastKeepAlive = currentMillis;
+    }
+  }
+
+  // --- 2. BUTTONS ---
+  for (int i = 0; i < 4; i++) {
+    if (digitalRead(buttonPins[i]) == LOW) {
+      delay(50);
+      int targetLed = ledMap[i];
+      ledState[targetLed] = !ledState[targetLed];
+      digitalWrite(ledPins[targetLed], ledState[targetLed] ? HIGH : LOW);
+      EEPROM.update(targetLed, ledState[targetLed]); 
+      while(digitalRead(buttonPins[i]) == LOW);
+    }
+  }
+
+  // --- 3. DAILY RESET (12:00 PM) ---
+  if (now.hour() == 12 && now.minute() == 0 && now.second() == 0) {
+    if (!resetPerformed) {
+      for (int k = 0; k < 4; k++) {
+        ledState[k] = false;
+        digitalWrite(ledPins[k], LOW);
+        EEPROM.update(k, false);
+      }
+      resetPerformed = true;
+    }
+  } else {
+    resetPerformed = false;
+  }
+}