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clavier.ino

@@ -0,0 +1,87 @@
+const byte ROWS = 4;
+const byte COLS = 4;
+
+char keys[ROWS][COLS] = {
+  {'1', '2', '3', 'A'},
+  {'4', '5', '6', 'B'},
+  {'7', '8', '9', 'C'},
+  {'*', '0', '#', 'D'}
+};
+
+byte rowPins[ROWS] = {9, 8, 6, 7};
+byte colPins[COLS]  = {5, 4, 2, 3};
+const byte RELAY_PIN = 10;
+
+const String CODE_ON  = "1234";
+const String CODE_OFF = "5678";
+const byte CODE_LEN = 4;
+
+String saisie = "";
+bool relaisActif = false;
+
+char lastKey = 0;
+unsigned long lastTime = 0;
+const unsigned long DEBOUNCE = 150;
+
+char scanKeypad() {
+  for (byte r = 0; r < ROWS; r++) {
+    for (byte i = 0; i < ROWS; i++) {
+      pinMode(rowPins[i], INPUT_PULLUP);
+    }
+    pinMode(rowPins[r], OUTPUT);
+    digitalWrite(rowPins[r], LOW);
+    delayMicroseconds(10);
+
+    for (byte c = 0; c < COLS; c++) {
+      pinMode(colPins[c], INPUT_PULLUP);
+      delayMicroseconds(10);
+      if (digitalRead(colPins[c]) == LOW) {
+        while (digitalRead(colPins[c]) == LOW);
+        delay(20);
+        return keys[r][c];
+      }
+    }
+  }
+  return 0;
+}
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(RELAY_PIN, OUTPUT);
+  digitalWrite(RELAY_PIN, HIGH);
+  Serial.println("Prêt.");
+}
+
+void loop() {
+  char key = scanKeypad();
+  if (key != 0) {
+    unsigned long now = millis();
+    if (key != lastKey || (now - lastTime) > DEBOUNCE) {
+      lastKey = key;
+      lastTime = now;
+
+      saisie += key;
+      Serial.print("Saisie : ");
+      Serial.println(saisie);
+
+      // Tronque si trop long
+      if (saisie.length() > CODE_LEN) {
+        saisie = saisie.substring(saisie.length() - CODE_LEN);
+      }
+
+      if (saisie == CODE_ON) {
+        relaisActif = true;
+        saisie = "";
+        Serial.println("Relais ON permanent.");
+      } else if (saisie == CODE_OFF) {
+        relaisActif = false;
+        saisie = "";
+        Serial.println("Relais OFF.");
+      }
+    }
+  } else {
+    lastKey = 0;
+  }
+
+  digitalWrite(RELAY_PIN, relaisActif ? LOW : HIGH);
+}