From ea4b646cb607083a133ba23d0f2153f6b070a58d Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <elena.valhalla@gmail.com>
Date: Wed, 4 Apr 2012 08:01:13 +0200
Subject: [PATCH] arduino sketch: yellow+blue light if there is no alarm /
 running RTC.

If the clock has somehow lost its settings it is useful to know :)
---
 .../fuzzy_alarm_clock_ds1307.pde                   | 43 ++++++++++++++++++----
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde b/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde
index 8d4c5ef..12ff745 100644
--- a/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde
+++ b/arduino_sketch/fuzzy_alarm_clock_ds1307/fuzzy_alarm_clock_ds1307.pde
@@ -100,7 +100,7 @@ void setup () {
             }
         }
     }
-    
+    reset_leds();
 }
 
 void loop () {
@@ -155,6 +155,21 @@ void save_status() {
     RTC.writeData(0x0a,cmin);
 }
 
+int has_alarm() {
+    if ( RTC.readData(0x00) >> 7 ) {
+        return false;
+    }
+    for ( int i = 0; i < NALARMS ; i ++ ) {
+        // we can skip checking the hour/minute field
+        for ( int j = 0; j < 3 ; j ++ ) {
+            if ( alarms[i][j] != 0 ) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
 // ****** Serial interface management *************************************** //
 
 void check_serial() {
@@ -198,6 +213,7 @@ void s_set_alarm() {
     Serial.print("Alarm ");
     Serial.print(i,DEC);
     Serial.println(" set.");
+    reset_leds();
 }
 
 void s_set_time() {
@@ -212,6 +228,7 @@ void s_set_time() {
     RTC.setClock();
     Serial.print("Time set: ");
     s_print_time();
+    reset_leds();
 }
 
 int s_read_dig() {
@@ -313,9 +330,7 @@ void s_reset_alarms() {
     st = 0;
     a = -1;
     save_status();
-    analogWrite(RPIN,128);
-    digitalWrite(YPIN,LOW);
-    digitalWrite(BPIN,LOW);
+    reset_leds();
 }
 
 void s_print_help() {
@@ -419,10 +434,22 @@ void set_leds() {
       st = 0;
       a = -1;
       save_status();
-      analogWrite(RPIN,128);
-      analogWrite(YPIN,0);
-      analogWrite(BPIN,0);
-  }
+      reset_leds();
+  } 
+}
+
+void reset_leds() {
+    if ( a < 0 ) {
+        if ( has_alarm() ) {
+            analogWrite(RPIN,128);
+            analogWrite(YPIN,0);
+            analogWrite(BPIN,0);
+        } else {
+            analogWrite(RPIN,0);
+            analogWrite(YPIN,16);
+            analogWrite(BPIN,16);
+        }
+    }
 }
 
 // PC speaker
-- 
2.11.4.GIT