fallback VID PID + hex json + RE info, keypad WIP

extensions/platformio/keypad_read/src/main.cpp

@@ -1,48 +1,76 @@
 #include <Arduino.h>
 
 const int BUZZER_PIN = 6;
-const int allPins[] = {0, 1, 2, 3, 4, 5, 7}; 
+const int pins[] = {0, 1, 2, 3, 4, 5, 7};
 const int numPins = 7;
 
-unsigned long lastDebounceTime = 0;
-const int debounceDelay = 250; 
+struct KeyMap {
+  int strobe;
+  int target;
+  char key;
+};
+
+// Your discovered mapping
+KeyMap keypad[] = {{7, 1, '1'}, {7, 2, '2'}, {3, 7, '3'}, {5, 0, 'C'},
+                   {7, 0, 'T'}, {4, 1, 'm'}, {1, 2, 'Y'}, {5, 3, '6'},
+                   {1, 0, '+'}, {2, 0, 'Z'}, {1, 5, '7'}, {5, 2, 'U'},
+                   {2, 5, '8'}, {3, 5, '9'}, {2, 4, 'M'}, {3, 1, '4'},
+                   {0, 2, '5'}, {3, 4, 'P'}, {4, 0, '$'}, {0, 4, 'L'}};
 
 void setup() {
   Serial.begin(115200);
-  for (int i = 0; i < numPins; i++) {
-    pinMode(allPins[i], INPUT_PULLUP);
+  for (int p : pins) {
+    pinMode(p, INPUT_PULLUP);
   }
+  // Keep buzzer pin high-impedance so it doesn't sink the matrix
+  pinMode(BUZZER_PIN, INPUT_PULLUP);
 }
 
-void loop() {
-  // Only scan if we aren't in the middle of a "hit" lockout
-  if (millis() - lastDebounceTime < debounceDelay) return;
+void playBeep() {
+  analogWrite(BUZZER_PIN, 10); 
+  
+  delay(50); // Beep duration
+  
+  analogWrite(BUZZER_PIN, 0); // Turn it off
+  pinMode(BUZZER_PIN, INPUT_PULLUP); // Reset to input for the matrix
+}
 
+char getKeyPressed() {
   for (int s = 0; s < numPins; s++) {
-    int strobe = allPins[s];
+    int strobe = pins[s];
 
     pinMode(strobe, OUTPUT);
     digitalWrite(strobe, LOW);
-    delayMicroseconds(100); // Slightly longer for stability
+    delayMicroseconds(50);
 
     for (int i = 0; i < numPins; i++) {
-      int target = allPins[i];
-      if (target == strobe) continue;
+      int target = pins[i];
+      if (target == strobe)
+        continue;
 
       if (digitalRead(target) == LOW) {
-        // WE FOUND ONE!
-        Serial.print("SINK:");
-        Serial.print(strobe);
-        Serial.print(" READ:");
-        Serial.println(target);
+        for (int k = 0; k < 20; k++) {
+          if (keypad[k].strobe == strobe && keypad[k].target == target) {
 
-        //tone(BUZZER_PIN, 2000, 50);
-        lastDebounceTime = millis();
-        
-        pinMode(strobe, INPUT_PULLUP);
-        return; // Jump out of the whole loop to reset the lockout
+            // Visual and Audio feedback
+            Serial.print("Pressed: ");
+            Serial.println(keypad[k].key);
+            playBeep();
+
+            while (digitalRead(target) == LOW)
+              ; // Wait for release
+            pinMode(strobe, INPUT_PULLUP);
+            return keypad[k].key;
+          }
+        }
       }
     }
     pinMode(strobe, INPUT_PULLUP);
   }
-}
+  return '\0';
+}
+
+void loop() {
+  getKeyPressed();
+  delay(10);
+}