From a09710fa4b13077fd961f742dab533e1b45f864b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrick=20Ha=C3=9Fel?= <git@patrick-hassel.de>
Date: Thu, 13 Mar 2025 14:47:14 +0100
Subject: [PATCH] beeper, buzzer

---
 src/beeper.cpp    | 33 +++++++++++++++++++++++++++++++++
 src/beeper.h      | 10 ++++++++++
 src/buzzer.cpp    | 15 +++++++++++++++
 src/buzzer.h      |  8 ++++++++
 src/countdown.cpp | 33 ++++++++++++++++++++++++++++++++-
 src/main.cpp      |  8 ++++++++
 6 files changed, 106 insertions(+), 1 deletion(-)
 create mode 100644 src/beeper.cpp
 create mode 100644 src/beeper.h
 create mode 100644 src/buzzer.cpp
 create mode 100644 src/buzzer.h

diff --git a/src/beeper.cpp b/src/beeper.cpp
new file mode 100644
index 0000000..e89c8e4
--- /dev/null
+++ b/src/beeper.cpp
@@ -0,0 +1,33 @@
+#include "beeper.h"
+
+#include <Arduino.h>
+
+#define BEEPER_GPIO           22
+#define BEEPER_INVERT         true
+
+unsigned long beeperDuration = 0;
+
+unsigned long beeperLast = 0;
+
+void beeperEnable(const bool enabled) {
+  digitalWrite(BEEPER_GPIO, (enabled ^ BEEPER_INVERT) ? HIGH : LOW);
+}
+
+void beeperSetup() {
+  pinMode(BEEPER_GPIO, OUTPUT);
+  beeperEnable(false);
+}
+
+void beeperLoop() {
+  const auto now = millis();
+  if (beeperDuration != 0 && now - beeperLast >= beeperDuration) {
+    beeperEnable(false);
+    beeperDuration = 0;
+  }
+}
+
+void beep(const unsigned long duration) {
+  beeperDuration = duration;
+  beeperLast = millis();
+  beeperEnable(beeperDuration > 0);
+}
diff --git a/src/beeper.h b/src/beeper.h
new file mode 100644
index 0000000..b78bc73
--- /dev/null
+++ b/src/beeper.h
@@ -0,0 +1,10 @@
+#ifndef BEEPER_H
+#define BEEPER_H
+
+void beeperSetup();
+
+void beeperLoop();
+
+void beep(unsigned long duration);
+
+#endif
diff --git a/src/buzzer.cpp b/src/buzzer.cpp
new file mode 100644
index 0000000..b4558da
--- /dev/null
+++ b/src/buzzer.cpp
@@ -0,0 +1,15 @@
+#include "buzzer.h"
+
+#include <Arduino.h>
+
+#define BUZZER_GPIO           23
+#define BUZZER_INVERT         true
+
+void buzzerSetup() {
+  pinMode(BUZZER_GPIO, OUTPUT);
+  buzzerEnable(false);
+}
+
+void buzzerEnable(const bool enabled) {
+  digitalWrite(BUZZER_GPIO, (enabled ^ BUZZER_INVERT) ? HIGH : LOW);
+}
diff --git a/src/buzzer.h b/src/buzzer.h
new file mode 100644
index 0000000..c4047d3
--- /dev/null
+++ b/src/buzzer.h
@@ -0,0 +1,8 @@
+#ifndef BUZZER_H
+#define BUZZER_H
+
+void buzzerSetup();
+
+void buzzerEnable(bool enabled);
+
+#endif
diff --git a/src/countdown.cpp b/src/countdown.cpp
index 1ad49e9..1d2c4ae 100644
--- a/src/countdown.cpp
+++ b/src/countdown.cpp
@@ -1,10 +1,16 @@
-#include "countdown.h"
 #include <LittleFS.h>
+
+#include "countdown.h"
+#include "beeper.h"
+#include "buzzer.h"
 #include "display.h"
 
 #define COUNTDOWN_END_SEQUENCE_STEPS      5
 #define COUNTDOWN_END_SEQUENCE_REPEAT     3
 
+#define HALF_BEEP_DURATION                1000
+#define LAST_10_BEEP_DURATION             100
+
 enum CountdownState {
   CONFIG, READY, RUNNING, PAUSED, END
 };
@@ -25,6 +31,10 @@ unsigned long countdownEndSequenceDelay = 0;
 
 unsigned long countdownEndSequenceLast = 0;
 
+bool countdownHalfTimeBeep = false;
+
+long countdownBeepSeconds = -1;
+
 void setState(const CountdownState newState) {
   if (countdownState == newState) {
     return;
@@ -32,6 +42,7 @@ void setState(const CountdownState newState) {
 
   countdownState = newState;
   const char* name;
+  bool buzzer = false;
   switch (countdownState) {
     case CONFIG:
       countdownRest = countdownMillis;
@@ -39,6 +50,8 @@ void setState(const CountdownState newState) {
       break;
     case READY:
       countdownRest = countdownMillis;
+      countdownHalfTimeBeep = false;
+      countdownBeepSeconds = -1;
       name = "READY";
       break;
     case RUNNING:
@@ -49,6 +62,7 @@ void setState(const CountdownState newState) {
       name = "PAUSED";
       break;
     case END:
+      buzzer = true;
       countdownEndSequenceDelay = 0;
       countdownEndSequenceStep = 0;
       name = "END";
@@ -57,6 +71,7 @@ void setState(const CountdownState newState) {
       name = "[???]";
       break;
   }
+  buzzerEnable(buzzer);
   Serial.printf("Mode: %s\n", name);
 }
 
@@ -165,6 +180,22 @@ void updateTime() {
   if (countdownLast != 0) {
     const auto diff = now - countdownLast;
     countdownRest -= static_cast<long>(diff);
+
+    if (countdownRest <= countdownMillis / 2) {
+      if (!countdownHalfTimeBeep) {
+        beep(HALF_BEEP_DURATION);
+        countdownHalfTimeBeep = true;
+      }
+    }
+
+    const auto seconds = static_cast<long>(ceil(countdownRest / 1000.0));
+    if (seconds <= 10 && seconds > 0) {
+      if (countdownBeepSeconds != seconds) {
+        beep(LAST_10_BEEP_DURATION);
+        countdownBeepSeconds = seconds;
+      }
+    }
+
     if (countdownRest <= 0) {
       countdownRest = 0;
       setState(END);
diff --git a/src/main.cpp b/src/main.cpp
index 4787c89..3baa5c5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,4 +1,6 @@
+#include "beeper.h"
 #include "button.h"
+#include "buzzer.h"
 #include "countdown.h"
 #include "display.h"
 
@@ -6,12 +8,18 @@ void setup() {
   delay(500);
   Serial.begin(115200);
   Serial.println("\n\n\nstartup");
+
+  beeperSetup();
   buttonSetup();
+  buzzerSetup();
+
   displaySetup();
+
   countdownSetup();
 }
 
 void loop() {
+  beeperLoop();
   buttonLoop();
   countdownLoop();
 }