keypad logic

src/keyboard.cpp

@@ -0,0 +1,71 @@
+#include "Arduino.h"
+#include "keyboard.h"
+
+Keyboard::Keyboard() {
+}
+
+Keyboard::init() {
+  this->thresholds = {40, 0, 0, 40, 40, 40, 40, 40, 20, 20};
+  this->touchDetected = {false, false, false, false, false, false, false, false, false, false};
+  touchAttachInterrupt(T0, gotTouch0, threshold[0]);
+//  touchAttachInterrupt(T1, gotTouch1, threshold[1]); // GPIO_00 not usable on dev board
+//  touchAttachInterrupt(T2, gotTouch2, threshold[2]); // GPIO_02 not usable on dev board
+  touchAttachInterrupt(T3, gotTouch3, threshold[3]);
+  touchAttachInterrupt(T4, gotTouch4, threshold[4]);
+  touchAttachInterrupt(T5, gotTouch5, threshold[5]);
+  touchAttachInterrupt(T6, gotTouch6, threshold[6]);
+  touchAttachInterrupt(T7, gotTouch7, threshold[7]);
+  touchAttachInterrupt(T8, gotTouch8, threshold[8]);
+  touchAttachInterrupt(T9, gotTouch9, threshold[9]);
+}
+
+Keyboard::gotTouch0() {
+  delay(10);
+  if (touchRead(T0) < threshold[0])
+    this->touchDetected[0] = true;
+}
+Keyboard::gotTouch1() {
+  delay(10);
+  if (touchRead(T1) < threshold[1])
+    this->touchDetected[1] = true;
+}
+Keyboard::gotTouch2() {
+  delay(10);
+  if (touchRead(T2) < threshold[2])
+    this->touchDetected[2] = true;
+}
+Keyboard::gotTouch3() {
+  delay(10);
+  if (touchRead(T3) < threshold[3])
+    this->touchDetected[3] = true;
+}
+Keyboard::gotTouch4() {
+  delay(10);
+  if (touchRead(T4) < threshold[4])
+    this->touchDetected[4] = true;
+}
+Keyboard::gotTouch5() {
+  delay(10);
+  if (touchRead(T5) < threshold[5])
+    this->touchDetected[5] = true;
+}
+Keyboard::gotTouch6() {
+  delay(10);
+  if (touchRead(T6) < threshold[6])
+    this->touchDetected[6] = true;
+}
+Keyboard::gotTouch7() {
+  delay(10);
+  if (touchRead(T7) < threshold[7])
+    this->touchDetected[7] = true;
+}
+Keyboard::gotTouch8() {
+  delay(10);
+  if (touchRead(T8) < threshold[8])
+    this->touchDetected[8] = true;
+}
+Keyboard::gotTouch9() {
+  delay(10);
+  if (touchRead(T9) < threshold[9])
+    this->touchDetected[9] = true;
+}

src/keyboard.h

@@ -0,0 +1,25 @@
+#ifndef _KEYBOARD_H
+#define _KEYBOARD_H
+
+#include "Arduino.h"
+
+class Keyboard {
+  public:
+    Keyboard();
+    void init();
+    bool touchDetected[10];
+  private:
+    uint8_t thresholds[10];
+    void gotTouch0();
+    void gotTouch1();
+    void gotTouch2();
+    void gotTouch3();
+    void gotTouch4();
+    void gotTouch5();
+    void gotTouch6();
+    void gotTouch7();
+    void gotTouch8();
+    void gotTouch9();
+};
+
+#endif /* _KEYBOARD_H */

src/main.cpp

@@ -7,33 +7,38 @@
  */
 #include "Arduino.h"
 
+#include "keyboard.h"
+
 #define LED_PIN 21
 
+Keyboard keyboard;
+
 void setup()
 {
   // initialize LED digital pin as an output.
   pinMode(LED_PIN, OUTPUT);
+  keyboard.init();
 }
 
 void loop()
 {
-  // turn the LED on (HIGH is the voltage level)
-  if ( touchRead(T0) < 50
-//    || touchRead(T1) < 50  // GPIO 00
-//    || touchRead(T2) < 50  // GPIO 02
-    || touchRead(T3) < 50
-    || touchRead(T4) < 50
-    || touchRead(T5) < 50
-    || touchRead(T6) < 50
-    || touchRead(T7) < 50
-    || touchRead(T8) < 20
-    || touchRead(T9) < 20) {
-    digitalWrite(LED_PIN, HIGH);
-  } else {
-  // turn the LED off by making the voltage LOW
-    digitalWrite(LED_PIN, LOW);
+  bool touched = false;
+  for(int i; i<=9; i++) {
+    if (keyboard.touchDetected[i] == true) {
+      keyboard.touchDetected[i] = false;
+      touched = true;
+    }
   }
 
+    if (touched == true) {
+      // turn the LED on (HIGH is the voltage level)
+      digitalWrite(LED_PIN, HIGH);
+    } else {
+      // turn the LED off by making the voltage LOW
+      digitalWrite(LED_PIN, LOW);
+    }
+
+
   // wait for a second
-  delay(1000);
+  delay(50);
 }