added trainsignal sketch

trainsignal/trainsignal.ino

@@ -0,0 +1,61 @@
+/* sketch of a mini train signal used with wooden toy trains
+ * 2019 / otto@socialnerds.org
+ * it's based off a standard signal of the austrian railways, uses
+ * 1 red, 1 yellow and two green lights. it cycles though the four
+ * sets it can show */
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(2, OUTPUT);
+  pinMode(3, OUTPUT);
+  pinMode(4, OUTPUT);
+  pinMode(5, OUTPUT);
+  
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  clearLights();
+  setHalt();
+  delay(5000);
+  clearLights();
+  setDrive();
+  delay(5000);
+  clearLights();
+  setDrive60();
+  delay(5000);
+  clearLights();
+  setDrive40();
+  delay(5000);
+}
+
+void clearLights()
+{
+  digitalWrite(2, HIGH);
+  digitalWrite(3, HIGH);
+  digitalWrite(4, HIGH);
+  digitalWrite(5, HIGH);
+  delay(1000);
+}
+
+void setHalt()
+{
+  digitalWrite(2, LOW);
+}
+
+void setDrive()
+{
+  digitalWrite(3, LOW);
+}
+
+void setDrive60()
+{
+  digitalWrite(3, LOW);
+  digitalWrite(4, LOW);
+}
+
+void setDrive40()
+{
+  digitalWrite(3, LOW);
+  digitalWrite(5, LOW);
+}