From 4a46ee65b9001fd7add8262adbcaeebcb9c100ff Mon Sep 17 00:00:00 2001
From: cryptogopher <git6453hub@michalczyk.pro>
Date: Thu, 8 Sep 2022 22:54:21 +0200
Subject: [PATCH] Initial commit

---
 button.ino   | 14 ++++++++++++++
 metronom.ino | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 button.ino
 create mode 100644 metronom.ino

diff --git a/button.ino b/button.ino
new file mode 100644
index 0000000..9fd0b9b
--- /dev/null
+++ b/button.ino
@@ -0,0 +1,14 @@
+volatile unsigned long lastButtonPress = millis();
+
+void buttonISRstate() {
+  if ((millis() - lastButtonPress) > 100) {
+    if (countdown > 0)
+      countdown = 0;
+    else
+      countdown = BREAK_LENGTH;
+  }
+}
+
+void buttonISRtime() {
+  lastButtonPress = millis();
+}
diff --git a/metronom.ino b/metronom.ino
new file mode 100644
index 0000000..e9be3bf
--- /dev/null
+++ b/metronom.ino
@@ -0,0 +1,32 @@
+const uint BUZZER_PIN = 0;
+
+const uint BUTTON_LED_PIN = 5;
+const uint BUTTON_PIN = 6;
+
+const int BREAK_LENGTH = 300000;
+const int BREAK_STEP = 2000;
+
+volatile int countdown = 0;
+int step;
+
+void setup() {
+  pinMode(BUTTON_PIN, INPUT_PULLUP);
+  // Order of ISRs matter: RISING should be invoked first
+  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), buttonISRtime, CHANGE);
+  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), buttonISRstate, RISING);
+}
+
+void loop() {
+  if (countdown > 0) {
+    step = min(BREAK_STEP, countdown);
+    countdown -= step;
+    
+    digitalWrite(BUTTON_LED_PIN, HIGH);
+    delay(min(BREAK_STEP/2, step));
+    digitalWrite(BUTTON_LED_PIN, LOW);
+    delay(max(step-BREAK_STEP/2, 0));
+  } else {
+    tone(BUZZER_PIN, 1000, 100);
+    delay(1000);
+  }
+}