From 506d463544825696386acf9aa4d572ff3301f7e4 Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kjetil.orbekk@gmail.com>
Date: Mon, 8 Feb 2016 21:18:18 -0500
Subject: Add keyboard code.

---
 keyboard-1/keyboard-1.ino | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 keyboard-2/keyboard-2.ino | 38 +++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 keyboard-1/keyboard-1.ino
 create mode 100644 keyboard-2/keyboard-2.ino

diff --git a/keyboard-1/keyboard-1.ino b/keyboard-1/keyboard-1.ino
new file mode 100644
index 0000000..5b76bdd
--- /dev/null
+++ b/keyboard-1/keyboard-1.ino
@@ -0,0 +1,50 @@
+const int rows[] = {4, 5};
+const int kRows = 2;
+
+const int columns[] = {6, 7};
+const int kColumns = 2;
+
+bool buttons[] = {false, false, false, false};
+
+void setup() {
+  for (int i = 0; i < kRows; i++) {
+    pinMode(rows[i], INPUT_PULLUP);
+  }
+  for (int i = 0; i < kColumns; i++) {
+    pinMode(columns[i], INPUT);
+  }
+  Serial.begin(9600);
+}
+
+bool scanKey(int row, int column) {
+  pinMode(columns[column], OUTPUT);
+  digitalWrite(columns[column], LOW);
+  bool pressed = digitalRead(rows[row]) == LOW;
+  pinMode(columns[column], INPUT);
+  return pressed;
+}
+
+void loop() {
+//  pinMode(4, INPUT_PULLUP);
+//  if (digitalRead(4) == LOW) {
+//    Serial.print("pushed: ");
+//    Serial.println(columns[0]);
+//  } else {
+//    Serial.println("not pushed");
+//  }
+  
+  for (int i = 0; i < kRows; i++) {
+    for (int j = 0; j < kColumns; j++) {
+      bool pressed = scanKey(i, j);
+      if (pressed != buttons[i * kColumns + j]) {
+        if (pressed) {
+          Serial.print("Button pressed: ");
+        } else {
+          Serial.print("Button released: ");
+        }
+        Serial.println(i * kColumns + j);
+        buttons[i * kColumns + j] = pressed;
+      }
+    }
+  }
+}
diff --git a/keyboard-2/keyboard-2.ino b/keyboard-2/keyboard-2.ino
new file mode 100644
index 0000000..2e1a4ab
--- /dev/null
+++ b/keyboard-2/keyboard-2.ino
@@ -0,0 +1,38 @@
+int rows[] = {0, 1};
+int columns[] = {2, 3, 4};
+int pins[] = {14, 15, 16, 17, 18, 19};
+
+void setup() {
+  for (int i = 0; i < 2; i++) {
+    pinMode(i, INPUT_PULLUP);
+  }
+  
+  pinMode(13, OUTPUT);
+  
+  for (int i=0; i<6; i++) {
+    pinMode(pins[i], OUTPUT);
+  }
+}
+
+bool key_pressed(const int key) {
+  const int row = key / 3;
+  const int column = key % 3;
+
+  pinMode(columns[column], OUTPUT);
+  digitalWrite(columns[column], LOW);
+  bool pressed = digitalRead(rows[row]) == LOW;
+  pinMode(columns[column], INPUT);
+
+  return pressed;
+}
+
+void loop() {
+  digitalWrite(13, HIGH);
+  for (int i=0; i<6; i++) {
+    if (key_pressed(i)) {
+      digitalWrite(pins[i], HIGH);
+    } else {
+      digitalWrite(pins[i], LOW);
+    }
+  }
+}
-- 
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