feat: Implement initial ESP32 school bell system with web interface, scheduling, and DFPlayer control.

src/main.cpp

@@ -7,8 +7,9 @@
 // DFPLAYER_RX_PIN  = 15
 // DFPLAYER_TX_PIN  = 16
 // BUSY_PIN         = 17 (LOW = busy)
-//esp32 sda  
-//esp32 scl 
+//esp32 sda  21
+//esp32 scl  22
+//MCU adalah Wemos ESP32 mini
 
 #include <Arduino.h>
 #include <WiFi.h>
@@ -33,9 +34,9 @@
 #define DFPLAYER_RX_PIN 16  //3 df
 #define DFPLAYER_TX_PIN 17 //2 df
 #define RELAY_PIN 19
-#define BUSY_PIN 23
+#define BUSY_PIN 5 //must high at boot (strapping pin)
 #define RESET_PIN 18
-#define BUZZER_PIN 5
+#define BUZZER_PIN 23
 
 #define RESET_HOLD_MS 15000UL
 #define MAX_SCHEDULES 20
@@ -73,6 +74,10 @@ bool buzzerState = false;
 bool adminResetBlinking = false;
 unsigned long adminResetEndTime = 0;
 
+// Button flags
+volatile bool btnClickPending = false;
+volatile bool btnLongPressPending = false;
+
 // OneButton instance for RESET_PIN
 OneButton button(RESET_PIN, true);
 
@@ -82,7 +87,7 @@ OneButton button(RESET_PIN, true);
 int selectBestChannel() {
   WiFi.mode(WIFI_STA);
   WiFi.disconnect();
-  delay(100);
+  vTaskDelay(pdMS_TO_TICKS(100));
 
   int n = WiFi.scanNetworks();
   int channelCount[14] = {0}; // channels 1-13
@@ -206,14 +211,24 @@ void saveSchedules() {
 //////////////////////////////////////////////////////////////////////////
 void initDFPlayer() {
   dfSerial.begin(9600, SERIAL_8N1, DFPLAYER_RX_PIN, DFPLAYER_TX_PIN);
-  delay(200);
+  vTaskDelay(pdMS_TO_TICKS(200));
+  myDFPlayer.setTimeOut(600); // Fix for clone MP3 players
   if (myDFPlayer.begin(dfSerial)) {
-    myDFPlayer.volume(25); // 0..30
+    myDFPlayer.volume(30); // 0..30 (Max volume)
   }
 }
 
 void playTrack(uint16_t track, const char* desc) {
   lastPlayedTrack = track;
+  
+  // Force relay ON immediately to protect against BUSY pin latency
+  digitalWrite(RELAY_PIN, LOW); 
+  relayOn = true;
+  // Set minimum hold time (5s) to ensure start of playback is heard
+  if (relayHoldUntil < millis() + 5000UL) {
+    relayHoldUntil = millis() + 5000UL;
+  }
+
   myDFPlayer.playMp3Folder(track); // as requested
   isPlaying = true;
   // notify
@@ -502,20 +517,21 @@ void resetAdminToDefault() {
 //////////////////////////////////////////////////////////////////////////
 void setup(){
   // Initialize Task Watchdog Timer (TWDT) to prevent watchdog resets
-  esp_task_wdt_init(30, true); // 30 seconds timeout, panic on timeout
+  // Disable panic mode and set longer timeout to prevent resets
+  esp_task_wdt_init(120, false); // 120 seconds timeout, don't panic on timeout
   esp_task_wdt_add(NULL); // Add current task to watchdog
   
   pinMode(STATUS_LED_PIN, OUTPUT);
   digitalWrite(STATUS_LED_PIN, LOW);
   pinMode(RELAY_PIN, OUTPUT);
   digitalWrite(RELAY_PIN, HIGH); // relay active LOW, so HIGH = off
-  pinMode(BUSY_PIN, INPUT); // busy pin input (LOW when busy)
+  pinMode(BUSY_PIN, INPUT_PULLUP); // busy pin input (LOW when busy)
   pinMode(RESET_PIN, INPUT_PULLUP);
   pinMode(BUZZER_PIN, OUTPUT);
   digitalWrite(BUZZER_PIN, LOW);
 
   Serial.begin(115200);
-  delay(200);
+  vTaskDelay(pdMS_TO_TICKS(200));
 
   if (!LittleFS.begin(true)) {
     Serial.println("[ERR] LittleFS mount failed");
@@ -582,18 +598,17 @@ void setup(){
   });
   ArduinoOTA.begin();
 
+
   // Setup OneButton callbacks
   button.setPressMs(15000); // Set long press to 15 seconds
   button.attachClick([]() {
-    // Click: play track 1000
-    Serial.println("[BUTTON] Click detected: playing track 1000");
-    playTrack(1000, "Manual Click");
+    // Just set flag, don't do heavy work here
+    btnClickPending = true;
   });
 
   button.attachLongPressStart([]() {
-    // Long press: reset admin credentials
-    Serial.println("[BUTTON] Long press detected: resetting admin credentials");
-    resetAdminToDefault();
+    // Just set flag
+    btnLongPressPending = true;
   });
 
 
@@ -611,6 +626,22 @@ void loop(){
   // Handle OneButton
   button.tick();
 
+  // Process button events outside of callback
+  if (btnClickPending) {
+    btnClickPending = false;
+    Serial.println("[BUTTON] Click detected: playing track 1000");
+    playTrack(1000, "Manual Click");
+  }
+
+  if (btnLongPressPending) {
+    btnLongPressPending = false;
+    Serial.println("[BUTTON] Long press detected: resetting admin credentials");
+    resetAdminToDefault();
+  }
+
+  // Reset watchdog early in the loop
+  esp_task_wdt_reset();
+
   // every second: send time & status
   if (millis() - lastTimeWS >= 1000) {
     lastTimeWS = millis();
@@ -674,6 +705,9 @@ void loop(){
         relayOn = true;
         if (relayHoldUntil < millis() + 15000UL) relayHoldUntil = millis() + 15000UL;
       }
+      
+      // Reset watchdog during schedule processing
+      esp_task_wdt_reset();
     }
   }
 
@@ -702,5 +736,6 @@ void loop(){
   // Reset Task Watchdog Timer to prevent timeout
   esp_task_wdt_reset();
   
-  delay(10); // tiny yield
+  // Use vTaskDelay instead of delay() to allow other tasks to run
+  vTaskDelay(pdMS_TO_TICKS(10)); // tiny yield
 }