Add exercise 2 and 3.

2 files changed, 57 insertions, 0 deletions

diff --git a/led-dim/led-dim.ino b/led-dim/led-dim.ino
new file mode 100644
index 0000000..fe41a53
--- /dev/null
+++ b/led-dim/led-dim.ino
@@ -0,0 +1,16 @@
+const int kLed = 10;
+const int kSensor = A0;
+
+void setup() {
+  pinMode(kSensor, INPUT);
+  pinMode(kLed, OUTPUT);
+}
+
+void loop() {
+  int value = analogRead(kSensor);
+  digitalWrite(kLed, HIGH);
+  delay(value);
+  digitalWrite(kLed, LOW);
+  delay(value);
+  printf("%s\n", value);
+}
diff --git a/rgb-led/rgb-led.ino b/rgb-led/rgb-led.ino
new file mode 100644
index 0000000..f635313
--- /dev/null
+++ b/rgb-led/rgb-led.ino
@@ -0,0 +1,41 @@
+int kPinRed = 9;
+int kPinGreen = 10;
+int kPinBlue = 11;
+
+void setup() {
+  pinMode(kPinRed, OUTPUT);
+  pinMode(kPinGreen, OUTPUT);
+  pinMode(kPinBlue, OUTPUT);
+}
+
+void loop() {
+  //analogWrite(kPinBlue, 100);
+  //delay(1000);
+
+  for (int i=0; i<768; i+=4) {
+    showColor(i);
+    delay(3);
+  }
+}
+
+void showColor(int color) {
+  int r, g, b;
+  if (color < 256) {
+    r = 255-color;
+    g = color;
+    b = 0;
+  } else if (color < 512) {
+    r = 0;
+    g = 255-(color-256);
+    b = color-256;
+  } else {
+    r = color-512;
+    g = 0;
+    b = 255-(color-512);
+  }
+
+  analogWrite(kPinRed, r);
+  analogWrite(kPinGreen, g);
+  analogWrite(kPinBlue, b);
+}
+