Week 5

week5-4/week5-4.ino

@@ -0,0 +1,42 @@
+const unsigned int scan[] = {5, 6, 7, 8};
+#define DATA 10
+#define LATCH 11
+#define CLK 12
+
+byte numbers[] = {
+  0xC0, 0xF9, 0xA4, 0xB0, 0x99,
+  0x92, 0x82, 0xF8, 0x80, 0x90
+};
+
+void setup() {
+  for (int i = 0; i < 4; i++) {
+    pinMode(scan[i], OUTPUT);
+    digitalWrite(scan[i], HIGH);
+  }
+  pinMode(DATA, OUTPUT);
+  pinMode(LATCH, OUTPUT);
+  pinMode(CLK, OUTPUT);
+}
+
+void show(int digits[10], int shift) {
+  for (int i = 0; i < 4; i++) {
+    digitalWrite(LATCH, LOW);
+    shiftOut(DATA, CLK, MSBFIRST, numbers[digits[(shift + i) % 10]]);
+    digitalWrite(LATCH, HIGH);
+    digitalWrite(scan[3-i], LOW);
+    delay(1);
+    digitalWrite(scan[3-i], HIGH);
+  }
+}
+
+void loop() {
+  static unsigned long checkpoint = 0;
+  static int digits[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  static int count = 0;
+  show(digits, count);
+  if (millis() - checkpoint > 500) {
+    count--;
+    if (count < 0) count = 9;
+    checkpoint = millis();
+  }
+}