Dog with blue eyes

Author: RoboUlbricht

timer/timer2_redeyes1/timer2_redeyes1.ino

@@ -0,0 +1,83 @@
+/**
+   Arduino Uno - Timer1 - 2x Blink
+   v. 1.0
+   Copyright (C) 2021 Robert Ulbricht
+   https://www.arduinoslovakia.eu
+
+   IDE: 1.8.15
+   https://www.arduinoslovakia.eu/2021/8/pes-s-modrymi-ocami?lang=en
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+void setupTimer2() {
+  noInterrupts();
+  // Clear registers
+  TCCR2A = 0;
+  TCCR2B = 0;
+  TCNT2 = 0;
+
+  // 200.32051282051282 Hz (16000000/((77+1)*1024))
+  OCR2A = 77;
+  // CTC
+  TCCR2A |= (1 << WGM21);
+  // Prescaler 1024
+  TCCR2B |= (1 << CS22) | (1 << CS21) | (1 << CS20);
+  // Output Compare Match A Interrupt Enable
+  TIMSK2 |= (1 << OCIE2A);
+  interrupts();
+}
+
+void setup() {
+  pinMode(9, OUTPUT);
+  pinMode(10, OUTPUT);
+  setupTimer2();
+}
+
+class pwmLed {
+    int led;
+    int pwm;
+    int direction;
+
+  public:
+    pwmLed(int _led, int _pwm = 0, int _direction = 1)
+      : led(_led), pwm(_pwm), direction(_direction)
+    {}
+
+    void Next() {
+      pwm += direction;
+      analogWrite(led, pwm);
+      if (pwm == 255)
+        direction = -1;
+      if (pwm == 0)
+        direction = 1;
+    }
+};
+
+// synchronous eyes
+pwmLed pwm1(9, 0, 1);
+pwmLed pwm2(10, 0, 1);
+
+ISR(TIMER2_COMPA_vect) {
+  static int divider = 0;
+  if (divider == 0) {
+    pwm1.Next();
+    pwm2.Next();
+  }
+  divider++;
+  divider %= 1;
+}
+
+void loop() {
+}

timer/timer2_redeyes2/timer2_redeyes2.ino

@@ -0,0 +1,83 @@
+/**
+   Arduino Uno - Timer1 - 2x Blink
+   v. 1.0
+   Copyright (C) 2021 Robert Ulbricht
+   https://www.arduinoslovakia.eu
+
+   IDE: 1.8.15
+   https://www.arduinoslovakia.eu/2021/8/pes-s-modrymi-ocami?lang=en
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+void setupTimer2() {
+  noInterrupts();
+  // Clear registers
+  TCCR2A = 0;
+  TCCR2B = 0;
+  TCNT2 = 0;
+
+  // 200.32051282051282 Hz (16000000/((77+1)*1024))
+  OCR2A = 77;
+  // CTC
+  TCCR2A |= (1 << WGM21);
+  // Prescaler 1024
+  TCCR2B |= (1 << CS22) | (1 << CS21) | (1 << CS20);
+  // Output Compare Match A Interrupt Enable
+  TIMSK2 |= (1 << OCIE2A);
+  interrupts();
+}
+
+void setup() {
+  pinMode(9, OUTPUT);
+  pinMode(10, OUTPUT);
+  setupTimer2();
+}
+
+class pwmLed {
+    int led;
+    int pwm;
+    int direction;
+
+  public:
+    pwmLed(int _led, int _pwm = 0, int _direction = 1)
+      : led(_led), pwm(_pwm), direction(_direction)
+    {}
+
+    void Next() {
+      pwm += direction;
+      analogWrite(led, pwm);
+      if (pwm == 255)
+        direction = -1;
+      if (pwm == 0)
+        direction = 1;
+    }
+};
+
+// eyes with phase shift
+pwmLed pwm1(9, 0, 1);
+pwmLed pwm2(10, 50, 1);
+
+ISR(TIMER2_COMPA_vect) {
+  static int divider = 0;
+  if (divider == 0) {
+    pwm1.Next();
+    pwm2.Next();
+  }
+  divider++;
+  divider %= 1;
+}
+
+void loop() {
+}