added code for tiny clay house project

2 files changed, 36 insertions, 1 deletions

diff --git a/README.adoc b/README.adoc
index 698e25a..c7de3c6 100644
--- a/README.adoc
+++ b/README.adoc
@@ -4,10 +4,17 @@ Every now and then I create a small Arduino (test) project. I think I should
 publish the stuff here — this is mostly cargo cult code that has been hammered
 into some semi-working form.
 
-=== lighting/strobe.ino
+=== lighting/
+
+==== strobe.ino
 
 The code behind my https://xenoworld.de/2017/01/18/blink.html[fluorescent light demo].
 
+=== tinyhouse.ino
+
+Quick hack for some soothing orange light put into a tiny desk-top house made
+of clay
+
 === humidity-led-indicator/
 
 Code for a small project which uses a humidity sensor (DHT22) and an
diff --git a/lighting/tinyhouse.ino b/lighting/tinyhouse.ino
new file mode 100644
index 0000000..f2bf4f8
--- /dev/null
+++ b/lighting/tinyhouse.ino
@@ -0,0 +1,28 @@
+void setup() {
+  pinMode(3, OUTPUT);
+  pinMode(5, OUTPUT);
+}
+
+int i = 127;
+int j = 127;
+
+void loop() {
+  delay(50);
+
+  i = limit(i + (random(2) == 0 ? 8 : -8), 16);
+  j = limit(j + (random(2) == 0 ? 2 : -2),  2);
+
+  analogWrite(3, j);
+  analogWrite(5, i);
+
+}
+
+int limit(int i, int within) {
+  if( i > (255 - within) )
+    return 255 - within;
+
+  if( i < within )
+    return within;
+
+  return i;
+}