Update Project_suggestions.md

doc/Project_suggestions.md

@@ -56,5 +56,9 @@ Symbolic execution engine for MIR internal format
 - Static analysis (for safely bound buffers)
 - Static analysis for data aging (opitmal ordering?)
 
+---
+## Printing device (William)
+- Rotating stick with LEDs at the end of the stick that can "print" text by switching the LEDs on and off with the right timings.
+
 ---
 ## Your ideas...
\ No newline at end of file