Create "normal" light-up-the-front-door pattern.

hello_gradient/Cargo.lock

@@ -108,12 +108,20 @@ dependencies = [
 name = "hello_gradient"
 version = "0.1.0"
 dependencies = [
+ "house 0.1.0",
  "itsybitsy_m0 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "itsybitsy_m0_lights 0.1.0",
  "lights 0.1.0",
  "panic-halt 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "house"
+version = "0.1.0"
+dependencies = [
+ "lights 0.1.0",
+]
+
 [[package]]
 name = "itsybitsy_m0"
 version = "0.5.0"

hello_gradient/Cargo.toml

@@ -10,6 +10,7 @@ codegen-units = 1
 debug = true
 
 [dependencies]
+house = { path = "../house" }
 itsybitsy_m0 = "0.5"
 lights = { path = "../lights" }
 lights_hal = { path = "../itsybitsy_m0_lights", package = "itsybitsy_m0_lights" }

hello_gradient/src/bin/door_light.rs

@@ -0,0 +1,37 @@
+#![no_std]
+#![no_main]
+
+use core::iter::repeat;
+use house::Harrogate;
+use lights::rgb::{linear_gradient, Rgb};
+use lights_hal::{boot, delay, entry};
+
+const OFF: Rgb = Rgb(0, 0, 0);
+const ON: Rgb = Rgb(255, 255, 255);
+
+/*
+ * 20 fade + 25 ON + 20 fade = 65 dots
+ * 85 OFF + 65 door = 150 dots
+ */
+
+#[entry]
+fn main() -> ! {
+    let mut lights = boot();
+    lights.heartbeat();
+
+    loop {
+        // blink light to demonstrate loop is still running
+        lights.heartbeat();
+
+        let door_highlight = linear_gradient(OFF, ON, 20)
+            .chain(repeat(ON).take(25))
+            .chain(linear_gradient(ON, OFF, 20));
+
+        Harrogate {
+            porch_back: repeat(OFF).take(85).chain(door_highlight),
+            porch_front: repeat(OFF),
+        }.render_to(&mut lights);
+
+        delay(48_000_000);
+    }
+}