Should work now, needs testing

src/main.rs

@@ -45,13 +45,17 @@ struct LightingMessage {
 }
 */
 
+struct SliderValues {
+    slider_r: u8,
+    slider_g: u8,
+    slider_b: u8
+}
+
 struct MainPage {
-    red: u8,
-    green: u8,
-    blue: u8,
     config: KeyboardConfig,
     btn_appearance: iced::widget::button::Appearance,
-    btn_size: u16
+    btn_size: u16,
+    slider_values: SliderValues,
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -59,7 +63,10 @@ enum MainPageMessages {
     UpdateColor {
         row: u8,
         col: u8
-    }
+    },
+    UpdatedSlider_R(u8),
+    UpdatedSlider_G(u8),
+    UpdatedSlider_B(u8)
 }
 
 
@@ -126,6 +133,8 @@ fn main() -> Result<(), iced::Error> {
 
 // USB Code
 fn send_lighting_update(col: u8, row: u8, r: u8, g: u8, b: u8, _a: u8) {
+    println!("Sending lighting update!");
+
     let config: KeyboardConfig = parse_config(&Path::new("numpad_config.json"));
     
     let context = libusb::Context::new().unwrap(); // Get a new USB context
@@ -168,7 +177,6 @@ impl Sandbox for MainPage {
     fn new() -> Self {
         println!("Creating UI");
         MainPage {
-            red: 0, green: 0, blue: 0,
             config: parse_config(&Path::new("numpad_config.json")),
             btn_appearance: iced::widget::button::Appearance {
                 shadow_offset: Vector {
@@ -181,7 +189,8 @@ impl Sandbox for MainPage {
                 border_color: iced::Color::from_rgb8(0xFF, 0xFF, 0xFF),
                 text_color: iced::Color::from_rgb8(0xFF, 0xFF, 0xFF)
             },
-            btn_size: 150
+            btn_size: 150,
+            slider_values: SliderValues { slider_r: 0, slider_g: 0, slider_b: 0 },
         }
     }
 
@@ -190,7 +199,17 @@ impl Sandbox for MainPage {
     }
 
     fn update(&mut self, message: Self::Message) {
-        println!("New message: {:?}", message);
+        match message {
+            MainPageMessages::UpdatedSlider_R(value) => { self.slider_values.slider_r = value; }
+            MainPageMessages::UpdatedSlider_G(value) => { self.slider_values.slider_g = value; }
+            MainPageMessages::UpdatedSlider_B(value) => { self.slider_values.slider_b = value; }
+            MainPageMessages::UpdateColor { row, col } => {
+                println!("{:?}", message);
+                send_lighting_update(col, row, self.slider_values.slider_r, self.slider_values.slider_g, self.slider_values.slider_b, 0x0);
+            }
+            _ => { println!("New message: {:?}", message); }
+        }
+
     }
 
     fn view(&self) -> iced::Element<'_, Self::Message> {
@@ -264,9 +283,13 @@ impl Sandbox for MainPage {
 
         // Create the color selector
 
-        let slider_r = Slider::new();
+        let slider_r = Slider::new(0..=255, self.slider_values.slider_r, MainPageMessages::UpdatedSlider_R);
+        let slider_g = Slider::new(0..=255, self.slider_values.slider_g, MainPageMessages::UpdatedSlider_G);
+        let slider_b = Slider::new(0..=255, self.slider_values.slider_b, MainPageMessages::UpdatedSlider_B);
         let color_selector_col = Column::new()
             .push(slider_r)
+            .push(slider_g)
+            .push(slider_b)
             .height(iced::Length::Fill).width(iced::Length::Fill);
 
         let view_row = Row::new().height(iced::Length::Fill).width(iced::Length::Fill)