Added battery threshold alert blinking

README.md

@@ -22,6 +22,7 @@ The following external libraries are included and may not be licensed under the
   * Adafruit NeoPixel Library
   * SparkFun Lipo Fuel Gauge Library / Example code
   * "Sleepy" class from https://github.com/jcw/jeelib/
+  * Metro timing lib from https://github.com/thomasfredericks/Metro-Arduino-Wiring
 
 Non-Code License
 =

TODO.md

@@ -1,4 +1,3 @@
-  * Implement flashing lights if battery level is too low (use fuelgauge.isAlerting() and setAlertThreshold())
   * Need to implement PIR distance sensor to verify door of safe closed
   * Need to add support for Adafruit Trinket Pro
   * Add note about adjusting values for distance

src/src.ino

@@ -5,6 +5,7 @@
 #include "Wire.h"
 #include "MAX1704.h"
 #include "Sleepy.h"
+#include "Metro.h"
 #include "Adafruit_NeoPixel.h"
 #ifdef __AVR__
   #include <avr/power.h>
@@ -31,6 +32,7 @@
 // Objects / values / etc
 // //////////
 MAX1704 fuelGauge;
+Metro timer = Metro(1000); // Timer for battery level alert (flashes pixels red or yellow [if red set]) to alert
 float charge_percent;
 uint8_t brightness;
 uint16_t raw_color;
@@ -38,6 +40,7 @@ uint8_t color;
 bool always_on = false;
 Adafruit_NeoPixel neopix = Adafruit_NeoPixel(NEO_PIX_NUM, PIN_NEO, NEO_GRB + NEO_KHZ800);
 uint8_t rgb[3]; // index 0 = red / index 1 = green / index 2 = blue
+uint8_t red_threshold = 10; // 10 on the 360 degree mapping represents where red / orange / yellow start to bleed and the alert blink needs to be a different color
 bool white = false;
 bool max_found = false;
 bool door_open = false;
@@ -150,6 +153,17 @@ void pixel_update() {
 
   // Set color accordingly
   for (uint8_t i=0; i<NEO_PIX_NUM; i++) {
+    // Set to red/yellow for alert if alerting and the timer has run out
+    if (fuelGauge.isAlerting() && timer.check() == 1) {
+      if (color <= red_threshold) {
+        rgb[0] = 0;
+        rgb[1] = rgb[2] = 255;
+      }
+      else {
+        rgb[0] = 255;
+        rgb[1] = rgb[2] = 0;
+      }
+    }
     neopix.setPixelColor(i, neopix.Color(rgb[0], rgb[1], rgb[2]));
   }