session 4

docs/courses.md

@@ -13,6 +13,7 @@ This course focuses much heavier on programming. We are going to discuss some fu
 - [Session 1: Introduction](sessions/s1.md)
 - [Session 2: Loops & conditionals](sessions/s2.md)
 - [Session 3: Practical session](sessions/s3.md)
+- [Session 4: Variables](sessions/s4.md)
 
 ### Topics
 

docs/sessions/s4.md

@@ -0,0 +1,23 @@
+# Session 4: Variables
+
+## Recap (5 min)
+
+## Variables (15 min)
+
+- what are variables? (boxes to store information, different types for different things)
+- basic types: int, float, bool
+- what can we do with variable (put something in the box, see what's in the box)
+- assignment
+- storing function outputs in variables
+- comparison
+- using variables as function inputs
+
+## Practical task (60-70 min)
+
+- develop a lock with a PIN code
+- compare remote input (3-4 digits) with expected code
+- indicate correctness with and LED
+
+## Locoboard (if time allows)
+
+- show locoboard, explain what we can do with it