From 98f7689d8fbf9accabcb1c8d5ef4cd7d00c9ad91 Mon Sep 17 00:00:00 2001
From: Adrian Baumgart <adrian@abmgrt.dev>
Date: Mon, 13 Nov 2023 20:38:22 +0100
Subject: [PATCH] added fade animations

---
 software/src/main.cpp | 72 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 59 insertions(+), 13 deletions(-)

diff --git a/software/src/main.cpp b/software/src/main.cpp
index 6e604b5..a1f0f83 100644
--- a/software/src/main.cpp
+++ b/software/src/main.cpp
@@ -7,7 +7,8 @@
 #include <Arduino.h>
 #include <FastLED.h>
 
-void set_all_leds(CRGB leds[], int size, CRGB color);
+void set_all_leds(CRGB color, int brightness, int fade);
+void set_strip(CRGB leds[], int size, CRGB color);
 
 // Color when interior lights are on (e.g. door is open)
 // Color Temperature RGB values from: https://andi-siess.de/rgb-to-color-temperature/
@@ -22,8 +23,8 @@ CRGB driving_rgb = CRGB(240, 17, 17);
 #define RELAY_1 3
 
 // Input config
-#define IGNITION_POWER 7
-#define LIGHTING_POWER 8
+#define IGNITION_POWER A0
+#define LIGHTING_POWER A1
 bool ignition_on = false;
 bool lighting_on = false;
 
@@ -41,6 +42,13 @@ CRGB fl_leds[LED_FL_NUM];
 #define LED_FR_NUM 20
 CRGB fr_leds[LED_FR_NUM];
 
+// Animation settings
+#define FADE_ITERATIONS 50
+#define INTERIOR_FADE 1
+#define DRIVING_FADE 2
+
+int current_brightness = 0;
+CRGB current_color = CRGB(0,0,0);
 
 void setup() {
     // Add front-left LEDs
@@ -52,14 +60,16 @@ void setup() {
     pinMode(RELAY_1, OUTPUT);
     pinMode(IGNITION_POWER, INPUT_PULLUP);
     pinMode(LIGHTING_POWER, INPUT_PULLUP);
-
+    digitalWrite(RELAY_1, LOW);
+    Serial.begin(9600);
 }
 
 void loop() {
-    ignition_on = digitalRead(IGNITION_POWER);
-    lighting_on = digitalRead(LIGHTING_POWER);
+    ignition_on = analogRead(IGNITION_POWER) > 1000;
+    lighting_on = analogRead(LIGHTING_POWER) > 1000;
     if (!ignition_on && !lighting_on) {
         // Turn off LED Strip power
+        set_all_leds(CRGB(0,0,0), 0, 0);
         digitalWrite(RELAY_1, LOW);
     }
     else {
@@ -68,18 +78,54 @@ void loop() {
 
     // Interior light has priority
     if (lighting_on) {
-        FastLED.setBrightness(INTERIOR_BRIGHTNESS);
-        set_all_leds(fl_leds, LED_FL_NUM, interior_rgb);
-        set_all_leds(fr_leds, LED_FR_NUM, interior_rgb);
+
+        set_all_leds(interior_rgb, INTERIOR_BRIGHTNESS, INTERIOR_FADE);
     }
     else if (ignition_on) {
-        FastLED.setBrightness(DRIVING_BRIGHTNESS);
-        set_all_leds(fl_leds, LED_FL_NUM, driving_rgb);
-        set_all_leds(fr_leds, LED_FR_NUM, driving_rgb);
+        set_all_leds(driving_rgb, DRIVING_BRIGHTNESS, DRIVING_FADE);
     }
 }
 
-void set_all_leds(CRGB leds[], int size, CRGB color) {
+void set_all_leds(CRGB color, int brightness, int fade) {
+    // Calculate the difference between the new value and the current value.
+    // The order is important to have the right prefix.
+    // e.g. 200 -> 50 => 50-200 => -150
+    // 50 -> 200 => 200-50 = 150
+    int delta_brightness = brightness - current_brightness;
+    int delta_r = color.red - current_color.red;
+    int delta_g = color.green - current_color.green;
+    int delta_b = color.blue - current_color.blue;
+
+    for(int i = 1; i<=FADE_ITERATIONS;i++) {
+        // Calculate the new rgb and brightness value for each iteration.
+        // The delta is divided by the amount of fade iterations to get the required delta for each iteration
+        // Then we multiply this by the current iteration count, so it goes towards the total delta value from above
+        int brightness_step_value = current_brightness + ((delta_brightness / FADE_ITERATIONS)*i);
+        int red_step_value = current_color.red + ((delta_r / FADE_ITERATIONS)*i);
+        int green_step_value = current_color.green + ((delta_g / FADE_ITERATIONS)*i);
+        int blue_step_value = current_color.blue + ((delta_b / FADE_ITERATIONS)*i);
+
+        // to account for any rounding issues in the step value calculations, the right brightness and color is manually set on the last iteration
+        if (i == FADE_ITERATIONS) {
+            brightness_step_value = brightness;
+            red_step_value = color.red;
+            green_step_value = color.green;
+            blue_step_value = color.blue;
+        }
+
+        CRGB step_color = CRGB(red_step_value, green_step_value, blue_step_value);
+        FastLED.setBrightness(brightness_step_value);
+
+        set_strip(fl_leds, LED_FL_NUM, step_color);
+        set_strip(fr_leds, LED_FR_NUM, step_color);
+
+        delay(fade/FADE_ITERATIONS);
+    }
+    current_brightness = brightness;
+    current_color = color;
+}
+
+void set_strip(CRGB leds[], int size, CRGB color) {
     for(int i = 0;i<size;i++) {
         leds[i] = color;
     }